OPTICAL GLASS AND OPTICAL ELEMENT

TECHNICAL FIELD

The present invention relates to optical glass and an optical element.

BACKGROUND ART

Recently, as an augmented reality (AR) device, for example, a goggle type or spectacle type display device has been developed with the progress of an augmented reality (AR) technology. For example, in the goggle type display device, a lens having a high refractive index and a low specific weight is required, and there is a high demand for glass that can be applied to such a lens.

In Patent Documents 1 to 4, optical glass having a high refractive index is disclosed. However, the optical glass has a problem that a specific weight is excessively large with respect to a refractive index to be adopted as a lens for an AR device.

Therefore, optical glass of which a specific weight is reduced while maintaining a high refractive index is required.

Patent Document 1: JP Patent No. 5766002
Patent Document 2: JP Patent No. 5734587
Patent Document 3: JP Patent Application Laid Open No. 2016-88759
Patent Document 4: JP Patent Application Laid Open No. 2019-34874

SUMMARY

The present invention has been made in consideration of such circumstances, and an object thereof is to provide optical glass having a high refractive index and a comparatively low specific weight, and an optical element.

The gist of the present invention is as follows.

(1) Optical glass that is SiO₂—TiO₂—Nb₂O₅-based glass,

in which a content of SiO₂is 10% by mass or more,

a total content [Na₂O+K₂O+Cs₂O] of Na₂O, K₂O, and Cs₂O is 11.0% by mass or less, and

a specific weight and a refractive index nd satisfy Expression (1) described below.

nd≥0.2×Specific Weight+1.18 (1)

(2) Optical glass,

in which a content of SiO₂is 1 to 50% by mass,

a content of TiO₂is 1 to 50% by mass,

a content of BaO is 0 to 16.38% by mass,

a content of Nb₂O₅is 1 to 50% by mass,

a total content [Li₂O+Na₂O+K₂O+Cs₂O] of Li₂O, Na₂O, K₂O, and Cs₂O is 0.1 to 20% by mass,

a total content [La₂O₃+Gd₂O₃+Y₂O₃] of La₂O₃, Gd₂O₃, and Y₂O₃is 0 to 10% by mass,

a total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is 45 to 65% by mass,

a mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is 0.3 or more,

a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, K₂O, and Cs₂O is 0.1 to 1,

an Abbe's number νd is 25 or less, and

a refractive index nd is 1.86 or more.

(3) Optical glass,

in which a content of SiO₂is 1 to 50% by mass,

a content of TiO₂is 1 to 50% by mass,

a content of Nb₂O₅is 1 to 50% by mass,

a content of Na₂O is 0 to 8% by mass,

a total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is 40 to 80% by mass,

a mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is 0.3 or more,

a refractive index nd is 1.88 or more, and

a ratio [Refractive Index nd/Specific Weight] of the refractive index nd to a specific weight is 0.50 or more.

(4) The optical glass according to (3), in which a content of BaO is less than 16.0% by mass.

(5) Optical glass,

in which a mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] of a content of Li₂O to a total content of glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is 0.02 or more,

a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] of a content of TiO₂to a total content of TiO₂, Nb₂O₅, WO₃, ZrO₂, SrO, BaO, ZnO, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, and Bi₂O₃is 0.40 or more, and

a refractive index nd is 1.86 or more.

(6) An optical element, including:

the optical glass according to any one of (1) to (5).

(7) Alight guide plate, including:

the optical glass according to any one of (1) to (5).

(8) The light guide plate according to (7),

in which a diffraction grating is provided on a surface.

(9) An image display device, including:

an image display element; and

a light guide plate guiding light exiting from the image display element,

in which the light guide plate includes the optical glass according to any one of (1) to (5).

According to the present invention, optical glass having a high refractive index and a comparatively low specific weight, and an optical element can be provided.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a graph in which an example of optical glass according to a first embodiment of the present invention and optical glasses disclosed in Examples of Patent Documents 1 to 4 are plotted with a refractive index nd as a vertical axis and a specific weight as a horizontal axis;

FIG. 2 is a diagram illustrating a configuration of a head mounted display using a light guide plate that is one aspect of the present invention;

FIG. 3 is a side view schematically illustrating the configuration of the head mounted display using the light guide plate that is one aspect of the present invention;

FIG. 4 is a graph in which an example of optical glass according to a fourth embodiment of the present invention and the optical glasses disclosed in Examples of Patent Documents 1 to 4 are plotted with a mass ratio [Li₂O/{100-(SiO₂+B₂O₃+P₂O₅+GeO₂)}] as a vertical axis and a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] as a horizontal axis;

FIG. 5 is a graph in which an example of the optical glass according to the fourth embodiment of the present invention and the optical glasses disclosed in Examples of Patent Documents 1 to 4 are plotted with a ratio [Refractive Index nd/Specific Weight] of a refractive index nd to a specific weight as a vertical axis and a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] as a horizontal axis;

FIG. 6 is a picture of a glass sample obtained in Comparative Example 1;

FIG. 7 is a picture of a glass sample obtained in Comparative Example 2;

FIG. 8 is a picture of a glass sample obtained in Comparative Example 4;

FIG. 9 is a picture of a glass sample obtained in Comparative Example 5;

FIG. 10 is a picture of a glass sample obtained in Comparative Example 6; and

FIG. 11 is a picture of a glass sample obtained in Comparative Example 7.

In the present invention and the present specification, a glass composition is represented in terms of an oxide, unless otherwise specified. Here, the “glass composition in terms of an oxide” indicates a glass composition to be obtained by converting all glass raw materials as an oxide in glass that is obtained by decomposing all the glass raw materials in melting. The total content of all the glass components (excluding Sb(Sb₂O₃) and Ce(CeO₂) to be added as a clarificant) represented in terms of an oxide is 100% by mass. Each of the glass components is noted as SiO₂, TiO₂, and the like, in accord with the custom. Unless otherwise specified, the content and the total content of the glass components are on a mass basis, and “%” indicates “% by mass”.

The content of the glass component can be quantified by a known method, for example, a method such as an inductively coupled plasma atomic emission spectrometry (ICP-AES) and an inductively coupled plasma mass spectrometry (ICP-MS). In addition, in the present specification and the present invention, the content of a structural component of 0% indicates that the structural component is not substantially contained, and the component is allowed to be contained at an inevitable impurity level.

Hereinafter, the present invention will be described by being divided into a first embodiment, a second embodiment, a third embodiment, and a fourth embodiment.

First Embodiment

Optical glass according to a first embodiment is SiO₂—TiO₂—Nb₂O₅-based glass,

in which a content of SiO₂is 10% by mass or more,

a total content [Na₂O+K₂O+Cs₂O] of Na₂O, K₂O, and Cs₂O is 11.0% by mass or less, and

a specific weight and a refractive index nd satisfy Expression (1) described below.

nd≥0.2×Specific Weight+1.18 (1)

The optical glass according to the first embodiment is the SiO₂—TiO₂—Nb₂O₅-based glass. That is, SiO₂, TiO₂, and Nb₂O₅are contained as a glass component. According to the SiO₂—TiO₂—Nb₂O₅-based glass, a decrease in a strength and chemical durability can be suppressed.

In the optical glass according to the first embodiment, the content of SiO₂is 10% or more. A lower limit of the content of SiO₂is preferably 12%, and more preferably 15%, 18%, and 20% in this order. In addition, an upper limit of the content of SiO₂is preferably 40%, and more preferably 38%, 35%, 33%, and 30% in this order.

SiO₂is a network-forming component of the glass. By setting the content of SiO₂to be in the range described above, thermal stability, chemical durability, and weather resistance of the glass can be improved, and the viscosity of molten glass can be increased. On the other hand, in a case where the content of SiO₂is excessively high, the refractive index of the glass may decrease, and desired optical properties may not be obtained.

In the optical glass according to the first embodiment, the total content [Na₂O+K₂O+Cs₂O] of Na₂O, K₂O, and Cs₂O is 11.0% or less. An upper limit of the total content is preferably 10.0%, and more preferably 9.0%, 8.0%, 7.0%, and 6.0% in this order. In addition, a lower limit of the total content is preferably 0%.

By setting the total content [Na₂O+K₂O+Cs₂O] to be in the range described above, a high refractive index can be maintained while maintaining the thermal stability of the glass.

In the optical glass according to the first embodiment, the refractive index nd and the specific weight satisfy Expression (1) described below. The refractive index nd and the specific weight preferably satisfy Expression (2) described below, and more preferably satisfy Expression (3) described below. By the refractive index nd and the specific weight satisfying the following expressions, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

nd≥0.2×Specific Weight+1.18 (1)

nd≥0.2×Specific Weight+1.19 (2)

nd≥0.2×Specific Weight+1.20 (3)

Non-restrictive examples of the content, the ratio, and the properties of glass components other than the above in the optical glass according to the first embodiment will be described.

In the optical glass according to the first embodiment, an upper limit of the content of P₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of P₂O₅may be 0%.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the content of P₂O₅is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of B₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of B₂O₃is preferably 0%, and more preferably 0.5%, 0.8%, and 1.0% in this order.

B₂O₃is a network-forming component of the glass. B₂O₃has a function of improving the thermal stability of the glass, but in a case where the content of B₂O₃is excessively high, the refractive index may decrease. Accordingly, it is preferable that the content of B₂O₃is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of Al₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of Al₂O₃may be 0%.

Al₂O₃has a function of increasing the chemical durability, but in a case where the content of Al₂O₃is excessively high, melting properties of the glass may be degraded. Accordingly, it is preferable that the content of Al₂O₃is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the total content [SiO₂+Al₂O₃] of SiO₂and Al₂O₃is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, 35%, and 30% in this order.

In order to increase the thermal stability of the glass, it is preferable that the total content [SiO₂+Al₂O₃] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of a mass ratio [B₂O₃/(SiO₂+Al₂O₃)] of the content of B₂O₃to the total content of SiO₂and Al₂O₃is preferably 0.01, and more preferably 0.02, 0.03, and 0.04 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.18, 0.15, 0.13, and 0.10 in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the mass ratio [B₂O₃/(SiO₂+Al₂O₃)] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the total content [B₂O₃+P₂O₅] of B₂O₃and P₂O₅is preferably 0.5%, and more preferably 0.8% and 1.0% in this order. In addition, an upper limit of the total content is preferably 10%, and more preferably 8%, 5%, and 3% in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the total content [B₂O₃+P₂O₅] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the total content [B₂O₃+SiO₂] of B₂O₃and SiO₂is preferably 10%, and more preferably 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In order to obtain optical glass having a high refractive index, it is preferable that the total content [B₂O₃+SiO₂] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the content of ZrO₂is preferably 0%, and more preferably 0.1%, 0.5%, and 1.0% in this order. In addition, an upper limit of the content of ZrO₂is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of ZrO₂may be 0%.

ZrO₂is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of ZrO₂is excessively high, the thermal stability may decrease, and the specific weight may increase. Accordingly, it is preferable that the content of ZrO₂is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the content of TiO₂is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of TiO₂is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

TiO₂is a component that contributes to an increase in the refractive index, and has a function of improving glass stability. In addition, the refractive index can be increased without increasing the specific weight. On the other hand, in a case where the content of TiO₂is excessively high, the thermal stability may decrease. Accordingly, it is preferable that the content of TiO₂is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the content of Nb₂O₅is preferably 10%, and more preferably 13% and 15% in this order. In addition, an upper limit of the content of Nb₂O₅is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

Nb₂O₅is a component that contributes to an increase in the refractive index, and has a function of improving the glass stability. On the other hand, in a case where the content of Nb₂O₅is excessively high, the specific weight may increase, and the thermal stability may decrease. Accordingly, it is preferable that the content of Nb₂O₅is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is preferably 20%, and more preferably 25%, 30%, and 35% in this order. In addition, an upper limit of the total content is preferably 70%, and more preferably 65%, 60%, and 55% in this order.

TiO₂and Nb₂O₅are a component that contributes to an increase in the refractive index. Therefore, in order to obtain glass having desired optical properties, it is preferable that the total content of TiO₂and Nb₂O₅is in the range described above.

In the optical glass according to the first embodiment, a lower limit of a mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is preferably 0.20, and more preferably 0.25, 0.30, and 0.35 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [TiO₂/(TiO₂+Nb₂O₅)] is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of WO₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of WO₃may be 0%.

WO₃is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of WO₃is excessively high, the thermal stability may decrease, the specific weight may increase, the coloration of the glass may increase, and a transmittance may decrease. Accordingly, it is preferable that the content of WO₃is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of Bi₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Bi₂O₃is preferably 0%. The content of Bi₂O₃may be 0%.

Bi₂O₃has a function of improving the thermal stability of the glass at a suitable content. In addition, Bi₂O₃is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of Bi₂O₃is excessively high, the specific weight may increase. Further, the coloration of the glass may increase. Accordingly, it is preferable that the content of Bi₂O₃is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the total content [TiO₂+Nb₂O₅+WO₃+Bi₂O₃] of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃is preferably 80%, and more preferably 70% and 60% in this order. In addition, a lower limit of the total content is preferably 20%, and more preferably 25%, 30%, and 35% in this order.

All of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃are a component that contributes to an increase in the refractive index. Accordingly, it is preferable that the total content [TiO₂+Nb₂O₅+WO₃+Bi₂O₃] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the content of Li₂O is preferably 0.0%, and more preferably 0.1%, 0.3%, 0.5%, 0.8%, 1.0%, 1.3%, and 1.5% in this order. An upper limit of the content of Li₂O is preferably 10%, and more preferably 9%, 8%, 7%, 6%, and 5% in this order.

Li₂O is a component that contributes to a decrease in the specific weight, and is particularly a component that contributes to an increase in the refractive index among alkali metals. On the other hand, in a case where the content of Li₂O is excessively high, the thermal stability may decrease. Accordingly, it is preferable that the content of Li₂O is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of Na₂O is preferably 10%, and more preferably 9%, 8%, and 7% in this order. A lower limit of the content of Na₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order.

In the optical glass according to the first embodiment, an upper limit of the content of K₂O is preferably 10%, and more preferably 8% and 5% in this order. A lower limit of the content of K₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order. The content of K₂O may be 0%.

Na₂O and K₂O have a function of improving the melting properties of the glass. On the other hand, in a case where the contents of Na₂O and K₂O are excessively high, the refractive index may decrease, in addition, the thermal stability may decrease. Accordingly, it is preferable that the contents of Na₂O and K₂O are in the ranges described above, respectively.

In the optical glass according to the first embodiment, an upper limit of the content of Cs₂O is preferably 5%, and more preferably 3% and 1% in this order. A lower limit of the content of Cs₂O is preferably 0%.

Cs₂O has a function of improving the thermal stability of the glass, but in a case where the content of Cs₂O increases, the chemical durability and the weather resistance may decrease. Accordingly, it is preferable that the content of Cs₂O is in the range described above.

In the optical glass according to the first embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, and K₂O is preferably 0.00, and more preferably 0.10, 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, K₂O, and Cs₂O is preferably 0.10, and more preferably 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of the total content [Li₂O+Na₂O+K₂O+Cs₂O] of Li₂O, Na₂O, K₂O, and Cs₂O is preferably 1.5%, and more preferably 2%, 4%, and 6% in this order. An upper limit of the total content is preferably 15%, and more preferably 13% and 10% in this order.

In order to obtain optical glass excellent in the melting properties, it is preferable that the total content [Li₂O+Na₂O+K₂O+Cs₂O] is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of MgO is preferably 20%, and more preferably 15%, 10%, and 5% in this order. In addition, a lower limit of the content of MgO is preferably 0%.

In the optical glass according to the first embodiment, a lower limit of the content of CaO is preferably 1%, and more preferably 3%, 5%, and 8% in this order. An upper limit of the content of CaO is preferably 20%, and more preferably 18%, 15%, and 13% in this order.

MgO and CaO have a function of improving the melting properties of the glass. On the other hand, in a case where the contents of MgO and CaO are excessively high, the thermal stability may decrease. Accordingly, it is preferable that the contents of MgO and CaO are in the ranges described above, respectively.

In the optical glass according to the first embodiment, an upper limit of the content of SrO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of SrO is preferably 0%.

SrO has a function of improving the melting properties of the glass and of increasing the refractive index. On the other hand, in a case where the content of SrO is excessively high, the thermal stability may decrease, and the specific weight may increase. Accordingly, it is preferable that the content of SrO is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of BaO is preferably 20%, and more preferably 17%, 15%, 13%, and 10% in this order. In addition, a lower limit of the content of BaO is preferably 0%.

BaO has a function of improving the melting properties of the glass and of increasing the refractive index. On the other hand, in a case where the content of BaO is excessively high, the thermal stability may decrease, and the specific weight may increase. Accordingly, it is preferable that the content of BaO is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of ZnO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of ZnO is preferably 0%.

ZnO is a glass component having a function of improving the thermal stability of the glass. However, in a case where the content of ZnO is excessively high, the specific weight may increase. Accordingly, from the viewpoint of improving the thermal stability of the glass and of maintaining desired optical properties, it is preferable that the content of ZnO is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the total content [MgO+CaO+SrO+BaO+ZnO] of MgO, CaO, SrO, BaO, and ZnO is preferably 40%, and more preferably 35%, 30%, and 25% in this order. In addition, a lower limit of the total content is preferably 3%, and more preferably 5%, 8%, and 10% in this order. From the viewpoint of suppressing an increase in the specific weight and of maintaining the thermal stability without hindering high dispersion, it is preferable that the total content is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of Ta₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Ta₂O₅is preferably 0%.

Ta₂O₅is a component that contributes to an increase in the refractive index. In addition, Ta₂O₅is a glass component having a function of improving the thermal stability of the glass, and is also a component for decreasing Pg,F. On the other hand, in a case where the content of Ta₂O₅increases, the thermal stability of the glass may decrease, and when melting the glass, the unmelted residue of the glass raw material is likely to be generated. In addition, the specific weight may increase. Accordingly, it is preferable that the content of Ta₂O₅is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of La₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of La₂O₃is preferably 0%.

La₂O₃is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of La₂O₃increases, the specific weight may increase, and the thermal stability of the glass may decrease. Accordingly, from the viewpoint of suppressing an increase in the specific weight and a decrease in the thermal stability of the glass, it is preferable that the content of La₂O₃is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Y₂O₃is preferably 0%.

Y₂O₃is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of Y₂O₃excessively increases, the thermal stability of the glass may decrease, and the glass is likely to be devitrified during manufacturing. Accordingly, from the viewpoint of suppressing a decrease in the thermal stability of the glass, it is preferable that the content of Y₂O₃is in the range described above.

In the optical glass according to the first embodiment, the content of Sc₂O₃is preferably 2% or less. In addition, a lower limit of the content of Sc₂O₃is preferably 0%.

In the optical glass according to the first embodiment, the content of HfO₂is preferably 2% or less. In addition, a lower limit of the content of HfO₂is preferably 0%.

Sc₂O₃and HfO₂have a function of increasing dispersivity of the glass, but are an expensive component. Accordingly, it is preferable that the contents of Sc₂O₃and HfO₂are in the ranges described above, respectively.

In the optical glass according to the first embodiment, the content of Lu₂O₃is preferably 2% or less. In addition, a lower limit of the content of Lu₂O₃is preferably 0%.

Lu₂O₃has a function of increasing dispersivity of the glass, but has a high molecular weight, and thus, is also a glass component for increasing the specific weight of the glass. Accordingly, it is preferable that the content of Lu₂O₃is in the range described above.

In the optical glass according to the first embodiment, the content of GeO₂is preferably 2% or less. In addition, a lower limit of the content of GeO₂is preferably 0%.

GeO₂has a function of increasing dispersivity of the glass, but is a prominently expensive component among the glass components that are generally used. Accordingly, from the viewpoint of reducing a manufacturing cost of the glass, it is preferable that the content of GeO₂is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the content of Gd₂O₃is preferably 3.0%, and more preferably 2.0%. In addition, a lower limit of the content of Gd₂O₃is preferably 0%.

Gd₂O₃is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of Gd₂O₃excessively increases, the thermal stability of the glass may decrease. In addition, in a case where the content of Gd₂O₃excessively increases, the specific weight of the glass may increase, which is not preferable. Accordingly, from the viewpoint of suppressing an increase in the specific weight while excellently maintaining the thermal stability of the glass, it is preferable that the content of Gd₂O₃is in the range described above.

In the optical glass according to the first embodiment, the content of Yb₂O₃is preferably 2% or less. In addition, a lower limit of the content of Yb₂O₃is preferably 0%.

Yb₂O₃has a molecular weight higher than those of La₂O₃, Gd₂O₃, and Y₂O₃, and thus, increases the specific weight of the glass. In a case where the specific weight of the glass increases, the mass of an optical element increases. Accordingly, it is desirable to suppress an increase in the specific weight of the glass by reducing the content of Yb₂O₃.

In addition, in a case where the content of Yb₂O₃is excessively high, the thermal stability of the glass may decrease. From the viewpoint of preventing a decrease in the thermal stability of the glass and of suppressing an increase in the specific weight, it is preferable that the content of Yb₂O₃is in the range described above.

In the optical glass according to the first embodiment, an upper limit of the total content [La₂O₃+Gd₂O₃+Y₂O₃] of La₂O₃, Gd₂O₃, and Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. A lower limit of the total content is 0%. The total content may be 0%.

From the viewpoint of suppressing an increase in the specific weight and of excellently maintaining the thermal stability, it is preferable that the total content [La₂O₃+Gd₂O₃+Y₂O₃] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of a mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] of the content of Li₂O to the total content of the glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is preferably 0.00, and more preferably 0.02, 0.03, 0.04, 0.05, and 0.06 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.15, 0.13, and 0.10 in this order.

Note that, the total content of all the glass components is 100% by mass. Therefore, the total content of the glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is represented by [100−(SiO₂+B₂O₃+P₂O₅+GeO₂)]. From the viewpoint of obtaining optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] is in the range described above.

In the optical glass according to the first embodiment, a lower limit of a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] of the content of TiO₂to the total content of TiO₂, Nb₂O₅, WO₃, ZrO₂, SrO, BaO, ZnO, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, and Bi₂O₃is preferably 0.40, and more preferably 0.42, 0.44, 0.46, 0.48, and 0.50 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

From the viewpoint of increasing the refractive index while suppressing an increase in the specific weight, it is preferable that the mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] is in the range described above.

It is preferable that the optical glass according to the first embodiment mainly contains the glass components described above, that is, Li₂O and TiO₂as an essential component, and SiO₂, P₂O₅, B₂O₃, Al₂O₃, ZrO₂, Nb₂O₅, WO₃, Bi₂O₃, Na₂O, K₂O, Cs₂O, MgO, CaO, SrO, BaO, ZnO, Ta₂O₅, La₂O₃, Y₂O₃, Sc₂O₃, HfO₂, Lu₂O₃, GeO₂, Gd₂O₃, and Yb₂O₃as an arbitrary component, and the total content of the glass components described above is preferably 95% or more, more preferably 98% or more, even more preferably 99% or more, and still even more preferably 99.5% or more.

Note that, it is preferable that the optical glass according to the first embodiment basically contains the glass components described above, and other components can also be contained within a range not impairing the functions and the effects of the present invention. In addition, in the present invention, containing inevitable impurities is not excluded.

(Other Components)

All of Pb, As, Cd, Tl, Be, and Se have toxicity. Accordingly, it is particularly preferable that the optical glass according to the first embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

All of U, Th, and Ra are a radioactive element. Accordingly, it is particularly preferable that the optical glass according to the first embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, and Tm increase the coloration of the glass, and can be a fluorescent light source. Accordingly, it is particularly preferable that the optical glass according to the first embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

Sb(Sb₂O₃) and Ce(CeO₂) are an element that functions as a clarificant and can be added arbitrarily. Among them, Sb(Sb₂O₃) is a clarificant having a high clarifying effect. Ce(CeO₂) has a clarifying effect lower than that of Sb(Sb₂O₃). In a case where Ce(CeO₂) is added in large amounts, the coloration of the glass tends to be thickened.

Note that, herein, the contents of Sb(Sb₂O₃) and Ce(CeO₂) are represented by an external ratio, and are not included in the total content of all the glass components represented in terms of an oxide. That is, herein, the total content of all the glass components excluding Sb(Sb₂O₃) and Ce(CeO₂) is 100% by mass.

The content of Sb₂O₃is represented by an external ratio. That is, in the optical glass according to the first embodiment, the content of Sb₂O₃when the total content of all the glass components other than Sb₂O₃and CeO₂is 100% by mass is preferably 1% by mass or less, and more preferably 0.1% by mass or less, 0.05% by mass or less, and 0.03% by mass or less in this order. The content of Sb₂O₃may be 0% by mass.

The content of CeO₂is also represented by an external ratio. That is, in the optical glass according to the first embodiment, the content of CeO₂when the total content of all the glass components other than CeO₂and Sb₂O₃is 100% by mass is preferably 2% by mass or less, and more preferably 10% by mass or less, 0.5% by mass or less, and 0.10% by mass or less in this order. The content of CeO₂may be 0% by mass. By setting the content of CeO₂to be in the range described above, clarifying properties of the glass can be improved.

(Properties of Glass)

<Abbe's Number νd>

In the optical glass according to the first embodiment, an Abbe's number νd is preferably 15 to 30. The Abbe's number νd may be 18 to 25, or may be 20 to 24. By setting the Abbe's number νd to be in the range described above, glass having desired dispersivity can be obtained. The Abbe's number νd can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃, which are a glass component that contributes to high dispersion.

In the optical glass according to the first embodiment, a lower limit of the refractive index nd is 1.86. The lower limit of the refractive index nd can also be 1.87, 1.88, 1.89, or 1.90. In addition, an upper limit of the refractive index nd can be 2.20, and can also be 2.15, 2.10, or 2.05. The refractive index can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, Bi₂O₃, ZrO₂, La₂O₃, Gd₂O₃, Y₂O₃, and Ta₂O₅, which are a glass component that contributes to an increase in the refractive index.

The optical glass according to the first embodiment is high-refractive index glass and has the specific weight that is not high. In a case where the specific weight of the glass can be reduced, the weight of a lens can be reduced. On the other hand, in a case where the specific weight is excessively low, a decrease in the thermal stability is caused.

Therefore, in the optical glass according to the first embodiment, the specific weight is preferably 4.2 or less, and more preferably 4.0 or less, 3.8 or less, 3.6 or less, and 3.4 or less in this order.

The specific weight can be controlled by adjusting the content of each of the glass components. In particular, by adjusting the content of Li₂O or TiO₂, the specific weight can be reduced while maintaining a high refractive index.

In addition, in the optical glass according to the first embodiment, a ratio [Refractive Index nd/Specific Weight] of the refractive index nd to the specific weight is preferably 0.50 or more, more preferably 0.52 or more, and even more preferably 0.54 or more. By setting the ratio [Refractive Index nd/Specific Weight] to be in the range described above, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

In the optical glass according to the first embodiment, an upper limit of a glass transition temperature Tg is preferably 690° C., and more preferably 680° C., 660° C., 650° C., 630° C., and 600° C. in this order. A lower limit of the glass transition temperature Tg is not particularly limited, and is generally 500° C., and preferably 550° C.

The glass transition temperature Tg can be controlled by adjusting the total content of the alkali metals.

By the upper limit of the glass transition temperature Tg satisfying the range described above, an increase in a molding temperature when reheat-pressing the glass and an annealing temperature can be suppressed, and a thermal damage on a reheat press molding facility and an annealing facility can be reduced.

By the lower limit of the glass transition temperature Tg satisfying the range described above, reheat press moldability and the thermal stability of the glass are likely to be excellently maintained while maintaining a desired Abbe's number and a desired refractive index.

Light transmissivity of the optical glass according to the first embodiment can be evaluated by coloration degrees λ80, λ70, and λ5.

A spectral transmittance of a glass sample having a thickness of 10.0 mm±0.1 mm is measured in a range of a wavelength of 200 to 700 nm, and a wavelength at which an external transmittance is 80% is 80, a wavelength at which an external transmittance is 70% is λ70, and a wavelength at which an external transmittance is 5% is λ5.

λ80 of the optical glass according to the first embodiment is preferably 700 nm or less, more preferably 650 nm or less, and even more preferably 600 nm or less.

λ70 is preferably 600 nm or less, more preferably 550 nm or less, and even more preferably 500 nm or less.

λ5 is preferably 500 nm or less, more preferably 450 nm or less, and even more preferably 400 nm or less.

(Manufacturing of Optical Glass)

The glass raw materials may be blended to have the predetermined composition described above, and the optical glass according to the first embodiment may be prepared by the blended glass raw materials in accordance with a known glass manufacturing method. For example, a plurality of types of compounds are blended and sufficiently mixed to be a batch raw material, and the batch raw material is put in a quartz crucible or a platinum crucible and roughly melted. A melted product obtained by the rough melting is rapidly cooled and pulverized to prepare cullet. Further, the cullet is put in a platinum crucible and heated and remelted to be molten glass, and the molten glass is further clarified and homogenized, and then, is molded and gradually cooled to obtain optical glass. A known method may be applied to the molding and the gradual cooling of the molten glass.

Note that, the compound used when blending the batch raw material is not particularly limited insofar as a desired glass component can be introduced into the glass to have a desired content, and examples of such a compound include an oxide, a carbonate, a nitrate, a hydroxide, a fluoride, and the like.

(Manufacturing of Optical Element and Others)

A known method may be applied to the preparation of an optical element by using the optical glass according to the first embodiment. For example, in the manufacturing of the optical glass described above, the molten glass is cast into a mold and molded into the shape of a plate, and a glass material including the optical glass according to the present invention is prepared. The obtained glass material is suitably cut, ground, and polished, and a cut piece having a size and a shape suitable for press molding is prepared. The cut piece is heated and softened, and is press-molded (reheat-pressed) by a known method, and an optical element blank having a shape similar to the shape of the optical element is prepared. The optical element blank is annealed, and is ground and polished by a known method, and an optical element is prepared.

An optical functional surface of the prepared optical element may be coated with an antireflective film, a total reflection film, and the like, in accordance with the intended use.

According to one aspect of the present invention, an optical element including the optical glass described above can be provided. As the type of optical element, a lens such as a planar lens, a spherical lens, and an aspherical lens, a prism, a diffraction grating, a light guide plate, and the like can be exemplified. As the shape of the lens, various shapes such as a biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex meniscus lens, and a concave meniscus lens can be exemplified. As the use of the light guide plate, a display device such as an augmented reality (AR) display type spectacle type device or a mixed reality (MR) display type spectacle type device, and the like can be exemplified. Such a light guide plate is plate-shaped glass that can be attached to the frame of the spectacle type device, and includes the optical glass described above. A diffraction grating for changing a traveling direction of light that is propagated through the light guide plate by repeating total reflection may be formed on the surface of the light guide plate, as necessary. The diffraction grating can be formed by a known method. In a case of wearing a spectacle type device including the light guide plate, the light that is propagated through the light guide plate is incident on the pupils, and thus, the function of augmented reality (AR) display or mixed reality (MR) display is exhibited. Such a spectacle type device, for example, is disclosed in JP Patent Application Laid Open (Translation of PCT Application) No. 2017-534352 and the like. Note that, the light guide plate can be prepared by a known method. The optical element can be manufactured by a method including a step of processing a glass molded body containing the optical glass. As the processing, severing, cutting, rough grinding, fine grinding, polishing, and the like can be exemplified. By using the glass when performing such processing, a damage can be reduced, and a high-quality optical element can be stably supplied.

(Image Display Device)

Hereinafter, a light guide plate that is one aspect of the present invention, and an image display device using the light guide plate will be described in detail with reference to the drawing. Note that, in the drawings, the same reference numerals are applied to the same or corresponding parts, and the description will not be repeated.

FIG. 2 is a diagram illustrating the configuration of a head mounted display 1 (hereinafter, will be abbreviated to the “HMD 1”) using a light guide plate 10 that is one aspect of the present invention, in which FIG. 2(a) is a front perspective view of the HMD 1, and FIG. 2(b) is a rear perspective view of the HMD 1. As illustrated in FIG. 2(a) and FIG. 2(b), a spectacle lens 3 is attached to the front portion of a spectacle type frame 2 to be worn on the head of a user. A backlight 4 for illuminating an image is attached to an attachment portion 2a of the spectacle type frame 2. A signal processing device 5 for projecting an image and a speaker 6 reproducing a voice are provided in a temple portion of the spectacle type frame 2. Flexible printed circuits (FPC) 7 configuring wiring drawn out from a circuit of the signal processing device 5 are wired along the spectacle type frame 2. A display element unit (for example, a liquid crystal display element) 20 is wired by the FPC 7 to the center position of both eyes of the user, and is retained such that approximately the center portion of the display element unit 20 is arranged on an optical axis of the backlight 4. The display element unit 20 is relatively fixed to the light guide plate 10 to be positioned approximately in the center portion of the light guide plate 10. In addition, holographic optical elements (HOE) 32R and 32L (first optical elements) are closely fixed onto a first surface 10a of the light guide plate 10 by adhesion or the like in positions in front of the eyes of the user, respectively. A HOE 52R and a HOE 52L are stacked on a second surface 10b of the light guide plate 10 in a position facing the display element unit 20 through the light guide plate 10.

FIG. 3 is a side view schematically illustrating the configuration of the HMD 1 that is one aspect of the present invention. Note that, in FIG. 3, in order to clarify the drawing, only main parts of the image display device are illustrated, and the spectacle type frame 2 and the like are not illustrated. As illustrated in FIG. 3, the HMD 1 has a structure symmetrical to a center line X connecting the center of an image display element 24 and the center of the light guide plate 10. In addition, light of each wavelength incident on the light guide plate 10 from the image display element 24 is divided into two parts as described below and is guided to each of the right eye and the left eye of the user. The light path of the light of each wavelength to be guided to each of the eyes is also approximately symmetrical to the center line X.

As illustrated in FIG. 3, the backlight 4 includes a laser light source 21, a diffusion optical system 22, and a microlens array 23. The display element unit 20 is an image generating unit including the image display element 24, and for example, is activated by a field sequential method. The laser light source 21 includes laser light sources corresponding to each wavelength of R (a wavelength of 436 nm), G (a wavelength of 546 nm), and B (a wavelength of 633 nm), and sequentially applies light of each wavelength at a high speed. The light of each wavelength is incident on the diffusion optical system 22 and the microlens array 23, is converted into even and highly directional parallel light flux having no unevenness in the amount of light, and is perpendicularly incident on a display panel surface of the image display element 24.

The image display element 24, for example, is a transmissive liquid crystal (LCDT-LCOS) panel that is activated by a field sequential method. The image display element 24 modulates the light of each wavelength, in accordance with an image signal generated by an image engine (not illustrated) of the signal processing device 5. The light of each wavelength that is modulated by pixels in an effective region of the image display element 24 is incident on the light guide plate 10 with the sectional surface of the predetermined light flux (approximately the same shape as that of the effective region). Note that, the image display element 24, for example, can also be replaced with display elements in other forms such as a digital mirror device (DMD), a reflective liquid crystal (LCOS) panel, micro electro mechanical systems (MEMS), an organic electro-luminescence (EL), and an inorganic EL.

Note that, the display element unit 20 is not limited to the display element using the field sequential method, and may be an image generating unit simultaneous display element (a display element including RGB color filters with a predetermined array on the front surface of an exiting surface). In this case, as the light source, for example, a white light source is used.

As illustrated in FIG. 3, the light of each wavelength that is modulated by the image display element 24 is sequentially incident on the inside of the light guide plate 10 from the first surface 10a. The HOE 52R and the HOE 52L (second optical elements) are stacked on the second surface 10b of the light guide plate 10. The HOE 52R and the HOE 52L, for example, are a reflective volume-phase type HOE in a rectangular shape, and have a configuration in which three photopolymers in which each interference fringe corresponding to the light of each wavelength of R, G, and B is recorded are stacked. That is, the HOE 52R and the HOE 52L are configured to have a wavelength selection function of diffracting the light of each wavelength of R, G, and B and transmitting light of other wavelengths.

Note that, the HOE 32R and the HOE 32L are also a reflective volume-phase type HOE, and have the same layered structure as that of the HOE 52R and the HOE 52L. The HOE 32R and the HOE 32L and the HOE 52R and the HOE 52L, for example, may have approximately the same pitch of an interference fringe pattern.

The centers of the HOE 52R and the HOE 52L are coincident with each other, and the HOE 52R and the HOE 52L are stacked in a state where the interference fringe pattern is reversed by 180 (deg). Then, the HOE 52R and the HOE 52L are closely fixed onto the second surface 10b of the light guide plate 10 by adhesion or the like such that the centers are coincident with the center line X in the stacked state. The light of each wavelength that is modulated by the image display element 24 is sequentially incident on the HOE 52R and the HOE 52L through the light guide plate 10.

The HOE 52R and the HOE 52L apply a predetermined angle to diffract the light of each wavelength, in order to guide the light of each wavelength that is sequentially incident to each of the right eye and the left eye. The light of each wavelength that is diffracted by the HOE 52R and the HOE 52L repeats the total reflection on the interface between the light guide plate 10 and the air, is propagated through the light guide plate 10, and is incident on each of the HOE 32R and the HOE 32L. Here, the HOE 52R and the HOE 52L apply the same diffraction angle to the light of each wavelength. Accordingly, light of all wavelengths having approximately the same incident position with respect to the light guide plate 10 (or according to another expression, exiting from approximately the same coordinates in the effective region of the image display element 24) is propagated through approximately the same light path inside the light guide plate 10, and is incident on approximately the same position on the HOE 32R and the HOE 32L. According to another viewpoint, the HOE 52R and the HOE 52L diffract the light of each wavelength of RGB such that a pixel position relationship of an image in the effective region that is displayed in the effective region of the image display element 24 is faithfully reproduced on the HOE 32R and the HOE 32L.

As described above, in one aspect of the present invention, each of the HOE 52R and the HOE 52L diffracts the light of all wavelengths exiting from approximately the same coordinates in the effective region of the image display element 24 to be incident on approximately the same position of each of the HOE 32R and the HOE 32L. Alternatively, the HOE 52R and the HOE 52L may be configured to diffract the light of all wavelengths configuring originally the same pixels relatively shifted in the effective region of the image display element 24 to be incident on approximately the same position on the HOE 32R and the HOE 32L.

The light of each wavelength incident on the HOE 32R and the HOE 32L is diffracted by the HOE 32R and the HOE 32L, and sequentially exits from the second surface 10b of the light guide plate 10 to the outside approximately perpendicularly. As described above, the light of each wavelength exiting as approximately parallel light forms an image on each of the right eye retina and the left eye retina of the user, as a virtual image I as the image generated by the image display element 24. In addition, the HOE 32R and the HOE 32L may have a condenser function such that the user is capable of observing the virtual image I of an enlarged image. That is, light incident on the peripheral region of the HOE 32R and the HOE 32L may exit at an angle to be close to the center of the pupil, and may form an image on the retina of the user. Alternatively, in order for the user to observe the virtual image I of the enlarged image, the HOE 52R and the HOE 52L may diffract the light of each wavelength of RGB such that the pixel position relationship on the HOE 32R and the HOE 32L is in the enlarged similar shape with respect to the pixel position relationship of the image in the effective region that is displayed in the effective region of the image display element 24.

Since the equivalent optical path length in air of the light traveling through the light guide plate 10 decreases as a refractive index is high, an apparent viewing angle to the width of the image display element 24 can be increased by using the optical glass according to this embodiment that has a high refractive index. Further, since the refractive index is high, but the specific weight is suppressed to be low in the optical glass according to this embodiment, a light guide plate that is lightweight and has the effects described above can be provided.

Note that, the light guide plate that is one aspect of the present invention can be used in a see-through type transmissive head mounted display, a non-transmissive head mounted display, or the like.

In such head mounted displays, since the light guide plate includes the optical glass of this embodiment that has a high refractive index and a low specific weight, the head mounted displays have an excellent sense of immersion according to a wide viewing angle, and are preferable as an image display device that is used by being combined with an information terminal, is used to provide augmented reality (AR) or the like, or is used to provide movie watching, a game, virtual reality (VR), or the like.

The head mounted display has been described as an example, but the light guide plate may be attached to other image display devices.

Second Embodiment

Optical glass according to a second embodiment,

in which a content of SiO₂is 1 to 50% by mass,

a content of TiO₂is 1 to 50% by mass,

a content of BaO is 0 to 16.38% by mass,

a content of Nb₂O₅is 1 to 50% by mass,

a total content [Li₂O+Na₂O+K₂O+Cs₂O] of Li₂O, Na₂O, K₂O, and Cs₂O is 0.1 to 20% by mass,

a total content [La₂O₃+Gd₂O₃+Y₂O₃] of La₂O₃, Gd₂O₃, and Y₂O₃is 0 to 10% by mass,

a total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is 45 to 65% by mass,

a mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is 0.3 or more,

a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, K₂O, and Cs₂O is 0.1 to 1,

an Abbe's number νd is 25 or less, and

a refractive index nd is 1.86 or more.

In the optical glass according to the second embodiment, the content of SiO₂is 1 to 50%. A lower limit of the content of SiO₂is preferably 10%, and more preferably 12%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of SiO₂is preferably 40%, and more preferably 38%, 35%, 33%, and 30% in this order.

In the optical glass according to the second embodiment, the content of TiO₂is 1 to 50%. A lower limit of the content of TiO₂is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of TiO₂is preferably 45%, and more preferably 40% and 35% in this order.

By setting the content of TiO₂to be in the range described above, the refractive index can be increased, and the stability of the glass can be improved. In addition, the refractive index can be increased without increasing the specific weight. On the other hand, in a case where the content of TiO₂is excessively high, the thermal stability may decrease.

In the optical glass according to the second embodiment, the content of BaO is 0 to 16.38%. An upper limit of the content of BaO is preferably 15%, and more preferably 13% and 10% in this order. In addition, a lower limit of the content of BaO is preferably 0%.

By setting the content of BaO to be in the range described above, melting properties of the glass can be improved, and the refractive index can be increased. On the other hand, in a case where the content of BaO is excessively high, the thermal stability may decrease, and the specific weight may increase.

In the optical glass according to the second embodiment, the content of Nb₂O₅is 1 to 50%. A lower limit of the content of Nb₂O₅is preferably 10%, and more preferably 13% and 15% in this order. In addition, an upper limit of the content of Nb₂O₅is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

By setting the content of Nb₂O₅to be in the range described above, the refractive index can be increased, and the stability of the glass can be improved. On the other hand, in a case where the content of Nb₂O₅is excessively high, the specific weight may increase, and the thermal stability may decrease.

In the optical glass according to the second embodiment, the total content [Li₂O+Na₂O+K₂O+Cs₂O] of Li₂O, Na₂O, K₂O, and Cs₂O is 0.1 to 20%. A lower limit of the total content is preferably 1.5%, and preferably 2%, 4%, and 6% in this order. An upper limit of the total content is preferably 15%, and more preferably 13% and 10% in this order.

By setting the total content [Li₂O+Na₂O+K₂O+Cs₂O] to be in the range described above, optical glass excellent in the melting properties can be obtained.

In the optical glass according to the second embodiment, the total content [La₂O₃+Gd₂O₃+Y₂O₃] of La₂O₃, Gd₂O₃, and Y₂O₃is 0 to 10%. An upper limit of the total content is preferably 8%, and more preferably 5% and 3% in this order. A lower limit of the total content is 0%. The total content may be 0%.

In the optical glass according to the second embodiment, the total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is 45 to 65%. A lower limit of the total content is preferably 20%, and more preferably 25%, 30%, and 35% in this order. In addition, an upper limit of the total content is preferably 63%, and more preferably 61%, 59%, and 57% in this order.

By setting the total content [TiO₂+Nb₂O₅] to be in the range described above, the refractive index can be increased, and glass having desired optical properties can be obtained.

In the optical glass according to the second embodiment, the mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is 0.3 or more. A lower limit of the mass ratio is preferably 0.35, and more preferably 0.40 and 0.45 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

By setting the mass ratio [TiO₂/(TiO₂+Nb₂O₅)] to be in the range described above, optical glass having a high refractive index and a reduced specific weight can be obtained.

In the optical glass according to the second embodiment, the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, K₂O, and Cs₂O is 0.1 to 1. A lower limit of the mass ratio is preferably 0.15, and more preferably 0.20 and 0.25 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

By setting the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] to be in the range described above, optical glass having a high refractive index and a reduced specific weight can be obtained.

<Abbe's Number νd>

In the optical glass according to the second embodiment, the Abbe's number νd is 25 or less. The Abbe's number νd may be 15 to 25, may be 18 to 25, or may be 20 to 24. By setting the Abbe's number νd to be in the range described above, glass having desired dispersivity can be obtained. The Abbe's number νd can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃, which are a glass component that contributes to high dispersion.

In the optical glass according to the second embodiment, the refractive index nd is 1.86 or more. A lower limit of the refractive index nd can be 1.87, and can also be 1.88, 1.89, or 1.90. In addition, an upper limit of the refractive index nd can be 2.20, and can also be 2.15, 2.10, or 2.05. The refractive index can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, Bi₂O₃, ZrO₂, La₂O₃, Gd₂O₃, Y₂O₃, and Ta₂O₅, which are a glass component that contributes to an increase in the refractive index.

Non-restrictive examples of the content, the ratio, and the properties of glass components other than the above in the optical glass according to the second embodiment will be described.

In the optical glass according to the second embodiment, an upper limit of the content of P₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of P₂O₅may be 0%.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the content of P₂O₅is in the range described above.

In the optical glass according to the second embodiment, an upper limit of the content of B₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of B₂O₃is preferably 0%, and more preferably is 0.5%, 0.8%, and 1.0% in this order.

In the optical glass according to the second embodiment, an upper limit of the content of Al₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of Al₂O₃may be 0%.

Al₂O₃has a function of increasing the chemical durability, but in a case where the content of Al₂O₃is excessively high, the melting properties of the glass may be degraded. Accordingly, it is preferable that the content of Al₂O₃is in the range described above.

In the optical glass according to the second embodiment, a lower limit of the total content [SiO₂+Al₂O₃] of SiO₂and Al₂O₃is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, 35%, and 30% in this order.

In order to increase the thermal stability of the glass, it is preferable that the total content [SiO₂+Al₂O₃] is in the range described above.

In the optical glass according to the second embodiment, a lower limit of a mass ratio [B₂O₃/(SiO₂+Al₂O₃)] of the content of B₂O₃and the total content of SiO₂and Al₂O₃is preferably 0.01, and more preferably 0.02, 0.03, and 0.04 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.18, 0.15, 0.13, and 0.10 in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the mass ratio [B₂O₃/(SiO₂+Al₂O₃)] is in the range described above.

In the optical glass according to the second embodiment, a lower limit of the total content [B₂O₃+P₂O₅] of B₂O₃and P₂O₅is preferably 0.5%, and more preferably 0.8% and 1.0% in this order. In addition, an upper limit of the total content is preferably 10%, and more preferably 8%, 5%, and 3% in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the total content [B₂O₃+P₂O₅] is in the range described above.

In the optical glass according to the second embodiment, a lower limit of the total content [B₂O₃+SiO₂] of B₂O₃and SiO₂is preferably 10%, and more preferably 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In order to obtain optical glass having a high refractive index, it is preferable that the total content [B₂O₃+SiO₂] is in the range described above.

In the optical glass according to the second embodiment, a lower limit of the content of ZrO₂is preferably 0%, and more preferably 0.10%, 0.5%, and 1.0% in this order. In addition, an upper limit of the content of ZrO₂is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of ZrO₂may be 0%.

In the optical glass according to the second embodiment, an upper limit of the content of WO₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of WO₃may be 0%.

In the optical glass according to the second embodiment, an upper limit of the content of Bi₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Bi₂O₃is preferably 0%. The content of Bi₂O₃may be 0%.

Bi₂O₃has a function of improving the thermal stability of the glass at a suitable amount. In addition, Bi₂O₃is a component that contributes to an increase in the refractive index. On the other hand, in a case where the content of Bi₂O₃is excessively high, the specific weight may increase. Further, the coloration of the glass may increase. Accordingly, it is preferable that the content of Bi₂O₃is in the range described above.

In the optical glass according to the second embodiment, an upper limit of the total content [TiO₂+Nb₂O₅+WO₃+Bi₂O₃] of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃is preferably 80%, and more preferably 70% and 60% in this order. In addition, a lower limit of the total content is preferably 20%, and more preferably 25%, 30%, and 35% in this order.

In the optical glass according to the second embodiment, a lower limit of the content of Li₂O is preferably 0.1%, and more preferably 0.3%, 0.5%, 0.8%, 1.0%, 1.3%, and 1.5% in this order. An upper limit of the content of Li₂O is preferably 10%, and more preferably 9%, 8%, 7%, 6%, and 5% in this order.

In the optical glass according to the second embodiment, an upper limit of the content of Na₂O is preferably 10%, and more preferably 9%, 8%, and 7% in this order. A lower limit of the content of Na₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order.

In the optical glass according to the second embodiment, an upper limit of the content of K₂O is preferably 10%, and more preferably 8% and 5% in this order. A lower limit of the content of K₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order. The content of K₂O may be 0%.

Na₂O and K₂O have a function of improving the melting properties of the glass. On the other hand, in a case where the contents of Na₂O and K₂O are excessively high, the refractive index may decrease, and the thermal stability may decrease. Accordingly, it is preferable that the contents of Na₂O and K₂O are in the ranges described above, respectively.

In the optical glass according to the second embodiment, an upper limit of the content of Cs₂O is preferably 5%, and more preferably 3% and 1% in this order. A lower limit of the content of Cs₂O is preferably 0%.

In the optical glass according to the second embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, and K₂O is preferably 0.10, and more preferably 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] is in the range described above.

In the optical glass according to the second embodiment, a lower limit of the total content [Na₂O+K₂O+Cs₂O] of Na₂O, K₂O, and Cs₂O is preferably 0%. An upper limit of the total content is preferably 11.0%, and more preferably 10.0%, 9.0%, 8.0%, 7.0%, and 6.0% in this order.

In order to maintain a high refractive index while maintaining the thermal stability of the glass, it is preferable that the total content [Na₂O+K₂O+Cs₂O] is in the range described above.

In the optical glass according to the second embodiment, an upper limit of the content of MgO is preferably 20%, and more preferably 15%, 10%, and 5% in this order. In addition, a lower limit of the content of MgO is preferably 0%.

In the optical glass according to the second embodiment, a lower limit of the content of CaO is preferably 1%, and more preferably 3%, 5%, and 8% in this order. An upper limit of the content of CaO is preferably 20%, and more preferably 18%, 15%, and 13% in this order.

In the optical glass according to the second embodiment, an upper limit of the content of SrO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of SrO is preferably 0%.

In the optical glass according to the second embodiment, an upper limit of the content of ZnO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of ZnO is preferably 0%.

In the optical glass according to the second embodiment, an upper limit of the total content [MgO+CaO+SrO+BaO+ZnO] of MgO, CaO, SrO, BaO, and ZnO is preferably 40%, and more preferably 35%, 30%, and 25% in this order. In addition, a lower limit of the total content is preferably 3%, and more preferably 5%, 8%, and 10% in this order. From the viewpoint of suppressing an increase in the specific weight and of maintaining the thermal stability without hindering high dispersion, it is preferable that the total content is in the range described above.

In the optical glass according to the second embodiment, an upper limit of the content of Ta₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Ta₂O₅is preferably 0%.

In the optical glass according to the second embodiment, an upper limit of the content of La₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of La₂O₃is preferably 0%.

In the optical glass according to the second embodiment, an upper limit of the content of Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Y₂O₃is preferably 0%.

In the optical glass according to the second embodiment, the content of Sc₂O₃is preferably 2% or less. In addition, a lower limit of the content of Sc₂O₃is preferably 0%.

In the optical glass according to the second embodiment, the content of HfO₂is preferably 2% or less. In addition, a lower limit of the content of HfO₂is preferably 0%.

In the optical glass according to the second embodiment, the content of Lu₂O₃is preferably 2% or less. In addition, a lower limit of the content of Lu₂O₃is preferably 0%.

In the optical glass according to the second embodiment, the content of GeO₂is preferably 2% or less. In addition, a lower limit of the content of GeO₂is preferably 0%.

In the optical glass according to the second embodiment, an upper limit of the content of Gd₂O₃is preferably 3.0%, and more preferably 2.0%. In addition, a lower limit of the content of Gd₂O₃is preferably 0%.

In the optical glass according to the second embodiment, the content of Yb₂O₃is preferably 2% or less. In addition, a lower limit of the content of Yb₂O₃is preferably 0%.

In the optical glass according to the second embodiment, a lower limit of a mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] of the content of Li₂O to the total content of the glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is preferably 0.02, and more preferably 0.03, 0.04, 0.05, and 0.06 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.15, 0.13, and 0.10 in this order.

In the optical glass according to the second embodiment, a lower limit of a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] of the content of TiO₂to the total content of TiO₂, Nb₂O₅, WO₃, ZrO₂, SrO, BaO, ZnO, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, and Bi₂O₃is preferably 0.40, and more preferably 0.42, 0.44, 0.46, 0.48, and 0.50 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

From the viewpoint of suppressing an increase in the specific weight and of increasing the refractive index, it is preferable that the mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] is in the range described above.

It is preferable that the optical glass according to the second embodiment mainly contains the glass components described above, that is, SiO₂, TiO₂, and Nb₂O₅as an essential component, and BaO, P₂O₅, B₂O₃, Al₂O₃, ZrO₂, WO₃, Bi₂O₃, Li₂O, Na₂O, K₂O, Cs₂O, MgO, CaO, SrO, ZnO, Ta₂O₅, La₂O₃, Y₂O₃, Sc₂O₃, HfO₂, Lu₂O₃, GeO₂, Gd₂O₃, and Yb₂O₃as an arbitrary component, and the total content of the glass components described above is preferably 95% or more, more preferably 98% or more, even more preferably 99% or more, and still even more preferably 99.5% or more.

Note that, it is preferable that the optical glass according to the second embodiment basically contains the glass components described above, and other components can also be contained within a range not impairing the functions and the effects of the present invention. In addition, in the present invention, containing inevitable impurities is not excluded.

(Other Components)

All of Pb, As, Cd, Tl, Be, and Se have toxicity. Accordingly, it is particularly preferable that the optical glass according to the second embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

All of U, Th, and Ra are a radioactive element. Accordingly, it is particularly preferable that the optical glass according to the second embodiment does not contain such elements as the glass component. The content of each of the elements is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, and Tm increase the coloration of the glass, and can be a fluorescent light source. Accordingly, it is particularly preferable that the optical glass according to the second embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

The content of Sb₂O₃is represented by an external ratio. That is, in the optical glass according to the second embodiment, the content of Sb₂O₃when the total content of all the glass components other than Sb₂O₃and CeO₂is 100% by mass is preferably 1% by mass or less, and more preferably 0.1% by mass or less, 0.05% by mass or less, and 0.03% by mass or less in this order. The content of Sb₂O₃may be 0% by mass.

The content of CeO₂is also represented by an external ratio. That is, in the optical glass according to the second embodiment, the content of CeO₂when the total content of all the glass components other than CeO₂and Sb₂O₃is 100% by mass is preferably 2% by mass or less, and more preferably 1% by mass or less, 0.5% by mass or less, and 0.1% by mass or less in this order. The content of CeO₂may be 0% by mass. By setting the content of CeO₂to be in the range described above, clarifying properties of the glass can be improved.

(Properties of Glass)

The optical glass according to the second embodiment is high-refractive index glass and has the specific weight that is not high. In a case where the specific weight of the glass can be reduced, the weight of a lens can be reduced. On the other hand, in a case where the specific weight is excessively low, a decrease in the thermal stability is caused.

Therefore, in the optical glass according to the second embodiment, the specific weight is preferably 4.2 or less, and more preferably 4.0 or less, 3.8 or less, 3.6 or less, and 3.4 or less in this order.

Note that, in the optical glass according to the second embodiment, the refractive index nd and the specific weight preferably satisfy Expression (1) described below, more preferably satisfy Expression (2) described below, and even more preferably satisfy Expression (3) described below. By the refractive index nd and the specific weight satisfying the following expressions, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

nd≥0.2×Specific Weight+1.18 (1)

nd≥0.2×Specific Weight+1.19 (2)

nd≥0.2×Specific Weight+1.20 (3)

In addition, in the optical glass according to the second embodiment, a ratio [Refractive Index nd/Specific Weight] of the refractive index nd to the specific weight is preferably 0.50 or more, more preferably 0.52 or more, and even more preferably 0.54 or more. By setting the ratio [Refractive Index nd/Specific Weight] to be in the range described above, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

In the optical glass according to the second embodiment, an upper limit of a glass transition temperature Tg is preferably 680° C., and more preferably 670° C., 660° C., 650° C., 630° C., and 600° C. in this order. A lower limit of the glass transition temperature Tg is not particularly limited, and is generally 500° C., and preferably 550° C.

The glass transition temperature Tg can be controlled by adjusting the total content of the alkali metals.

Light transmissivity of the optical glass according to the second embodiment can be evaluated by coloration degrees λ80, λ70, and λ5.

A spectral transmittance of a glass sample having a thickness of 10.0 mm±0.1 mm is measured in a range of a wavelength 200 to 700 nm, and a wavelength at which an external transmittance is 80% is λ80, a wavelength at which an external transmittance is 70% is λ70, and a wavelength at which an external transmittance is 5% is λ5.

λ80 of the optical glass according to the second embodiment is preferably 700 nm or less, more preferably 650 nm or less, and even more preferably 600 nm or less.

λ70 is preferably 600 nm or less, more preferably 550 nm or less, and even more preferably 500 nm or less.

λ5 is preferably 500 nm or less, more preferably 450 nm or less, and even more preferably 400 nm or less.

(Manufacturing of Optical Glass)

The glass raw materials may be blended to have the predetermined composition described above, and the optical glass according to the second embodiment may be prepared by the blended glass raw material in accordance with a known glass manufacturing method. For example, a plurality of types of compounds are blended and sufficiently mixed to be a batch raw material, and the batch raw material is put in a quartz crucible or a platinum crucible and roughly melted. A melted product obtained by the rough melting is rapidly cooled and pulverized to prepare cullet. Further, the cullet is put in a platinum crucible and heated and remelted to be molten glass, and the molten glass is further clarified and homogenized, and then, is molded and gradually cooled to obtain optical glass. A known method may be applied to the molding and the gradual cooling of the molten glass.

(Manufacturing of Optical Element and Others)

A known method may be applied to the preparation of an optical element by using the optical glass according to the second embodiment. For example, in the manufacturing of the optical glass described above, the molten glass is cast into a mold and molded into the shape of a plate, and a glass material including the optical glass according to the present invention is prepared. The obtained glass material is suitably cut, ground, and polished, and a cut piece having a size and a shape suitable for press molding is prepared. The cut piece is heated and softened, and is press-molded (reheat-pressed) by a known method, and an optical element blank having a shape similar to the shape of the optical element is prepared. The optical element blank is annealed, and is ground and polished by a known method, and an optical element is prepared.

An optical functional surface of the prepared optical element may be coated with an antireflective film, a total reflection film, and the like, in accordance with the intended use.

According to one aspect of the present invention, an optical element including the optical glass described above can be provided. As the type of optical element, a lens such as a planar lens, a spherical lens, and an aspherical lens, a prism, a diffraction grating, a light guide plate, and the like can be exemplified. As the shape of the lens, various shapes such as a biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex meniscus lens, and a concave meniscus lens can be exemplified. As the use of the light guide plate, a display device such as an augmented reality (AR) display type spectacle type device or a mixed reality (MR) display type spectacle type device, and the like can be exemplified. Such a light guide plate is plate glass that can be attached to the frame of the spectacle type device, and includes the optical glass described above. A diffraction grating for changing a traveling direction of light that is propagated through the light guide plate by repeating total reflection may be formed on the surface of the light guide plate, as necessary. The diffraction grating can be formed by a known method. In a case of wearing a spectacle type device including the light guide plate, the light that is propagated through the light guide plate is incident on the pupils, and thus, the function of augmented reality (AR) display or mixed reality (MR) display is exhibited. Such a spectacle type device, for example, is disclosed in JP Patent Application Laid Open (Translation of PCT Application) No. 2017-534352 and the like. Note that, the light guide plate can be prepared by a known method. The optical element can be manufactured by a method including a step of processing a glass molded body containing the optical glass. As the processing, severing, cutting, rough grinding, fine grinding, polishing, and the like can be exemplified. By using the glass when performing such processing, a damage can be reduced, and a high-quality optical element can be stably supplied.

(Image Display Device)

An image display device according to the second embodiment can be the same as that of the first embodiment.

Third Embodiment

Optical glass according to a third embodiment,

in which a content of SiO₂is 1 to 50% by mass,

a content of TiO₂is 1 to 50% by mass,

a content of Nb₂O₅is 1 to 50% by mass,

a content of Na₂O is 0 to 8% by mass,

a total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is 40 to 80% by mass,

a mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is 0.3 or more,

a refractive index nd is 1.88 or more, and

a ratio [Refractive Index nd/Specific Weight] of the refractive index nd to a specific weight is 0.50 or more.

In the optical glass according to the third embodiment, the content of SiO₂is 1 to 50%. A lower limit of the content of SiO₂is preferably 10%, and more preferably 12%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of SiO₂is preferably 40%, and more preferably 38%, 35%, 33%, and 30% in this order.

In the optical glass according to the third embodiment, the content of TiO₂is 1 to 50%. A lower limit of the content of TiO₂is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of TiO₂is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In the optical glass according to the third embodiment, the content of Nb₂O₅is 1 to 50%. A lower limit of the content of Nb₂O₅is preferably 10%, and more preferably 13% and 15% in this order. In addition, an upper limit of the content of Nb₂O₅is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In the optical glass according to the third embodiment, the content of Na₂O is 0 to 8%. A lower limit of the content of Na₂O is preferably 0.5%, and more preferably 1.0%, 1.5%, and 2.0% in this order. In addition, an upper limit of the content of Na₂O is preferably 7%, and more preferably 6.5%, 5.5%, and 4.5% in this order.

By setting the content of Na₂O to be in the range described above, melting properties of the glass can be improved. On the other hand, in a case where the content of Na₂O is excessively high, the refractive index may decrease, and the thermal stability may decrease.

In the optical glass according to the third embodiment, the total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is 40 to 80%. A lower limit of the total content is preferably 42%, and more preferably 44%, 46%, and 48% in this order. In addition, an upper limit of the total content is preferably 70%, and more preferably 65%, 60%, and 55% in this order.

By setting the total content [TiO₂+Nb₂O₅] to be in the range described above, the refractive index can be increased, and glass having desired optical properties can be obtained.

In the optical glass according to the third embodiment, the mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is 0.3 or more. A lower limit of the mass ratio is preferably 0.35, and more preferably 0.40 and 0.45 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

By setting the mass ratio [TiO₂/(TiO₂+Nb₂O₅)] to be in the range described above, optical glass having a high refractive index and a reduced specific weight can be obtained.

In the optical glass according to the third embodiment, the refractive index nd is 1.88 or more. A lower limit of the refractive index nd can be 1.89, and can also be 1.90. In addition, an upper limit of the refractive index nd can be 2.20, and can also be 2.15, 2.10, or 2.05. The refractive index can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, Bi₂O₃, ZrO₂, La₂O₃, Gd₂O₃, Y₂O₃, and Ta₂O₅, which are a glass component that contributes to an increase in the refractive index.

In addition, in the optical glass according to the third embodiment, the ratio [Refractive Index nd/Specific Weight] of the refractive index nd to the specific weight is 0.50 or more. The ratio [Refractive Index nd/Specific Weight] is preferably 0.52 or more, and more preferably 0.54 or more. By setting the ratio [Refractive Index nd/Specific Weight] to be in the range described above, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

Non-restrictive examples of the content, the ratio, and the properties of glass components other than the above in the optical glass according to the third embodiment will be described.

In the optical glass according to the third embodiment, an upper limit of the content of P₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of P₂O₅may be 0%.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the content of P₂O₅is in the range described above.

In the optical glass according to the third embodiment, an upper limit of the content of B₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of B₂O₃is preferably 0%, and more preferably 0.5%, 0.8%, and 1.0% in this order.

In the optical glass according to the third embodiment, an upper limit of the content of Al₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of Al₂O₃may be 0%.

In the optical glass according to the third embodiment, a lower limit of the total content [SiO₂+Al₂O₃] of SiO₂and Al₂O₃is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, 35%, and 30% in this order.

In order to increase the thermal stability of the glass, it is preferable that the total content [SiO₂+Al₂O₃] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of a mass ratio [B₂O₃/(SiO₂+Al₂O₃)] of the content of B₂O₃to the total content of SiO₂and Al₂O₃is preferably 0.01, and more preferably 0.02, 0.03, and 0.04 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.18, 0.15, 0.13, and 0.10 in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the mass ratio [B₂O₃/(SiO₂+Al₂O₃)] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of the total content [B₂O₃+P₂O₅] of B₂O₃and P₂O₅is preferably 0.5%, and more preferably 0.8% and 1.0% in this order. In addition, an upper limit of the total content is preferably 10%, and more preferably 8%, 5%, and 3% in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the total content [B₂O₃+P₂O₅] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of the total content [B₂O₃+SiO₂] of B₂O₃and SiO₂is preferably 10%, and more preferably 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In order to obtain optical glass having a high refractive index, it is preferable that the total content [B₂O₃+SiO₂] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of the content of ZrO₂is preferably 0%, and more preferably 0.1%, 0.5%, and 1.0% in this order. In addition, an upper limit of the content of ZrO₂is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of ZrO₂may be 0%.

In the optical glass according to the third embodiment, an upper limit of the content of WO₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of WO₃may be 0%.

In the optical glass according to the third embodiment, an upper limit of the content of Bi₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Bi₂O₃is preferably 0%. The content of Bi₂O₃may be 0%.

In the optical glass according to the third embodiment, an upper limit of the total content [TiO₂+Nb₂O₅+WO₃+Bi₂O₃] of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃is preferably 80%, and more preferably 70% and 60% in this order. In addition, a lower limit of the total content is preferably 20%, and more preferably 25%, 30%, and 35% in this order.

In the optical glass according to the third embodiment, a lower limit of the content of Li₂O is preferably 0.0%, and more preferably 0.1%, 0.3%, 0.5%, 0.8%, 1.0%, 1.3%, and 1.5% in this order. An upper limit of the content of Li₂O is preferably 10%, and more preferably 9%, 8%, 7%, 6%, and 5% in this order.

In the optical glass according to the third embodiment, an upper limit of the content of K₂O is preferably 10%, and more preferably 8% and 5% in this order. A lower limit of the content of K₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order. The content of K₂O may be 0%.

K₂O has a function of improving the melting properties of the glass. On the other hand, in a case where the content of K₂O is excessively high, the refractive index may decrease, and the thermal stability may decrease. Accordingly, it is preferable that the content of K₂O is in the range described above.

In the optical glass according to the third embodiment, an upper limit of the content of Cs₂O is preferably 5%, and more preferably 3% and 1% in this order. A lower limit of the content of Cs₂O is preferably 0%.

In the optical glass according to the third embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, and K₂O is preferably 0.00, and more preferably 0.10, 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of the total content [Na₂O+K₂O+Cs₂O] of Na₂O, K₂O, and Cs₂O is preferably 0%. An upper limit of the total content is preferably 11.0%, and more preferably 10.0%, 9.0%, 8.0%, 7.0%, and 6.0% in this order.

In order to maintain a high refractive index while maintaining the thermal stability of the glass, it is preferable that the total content [Na₂O+K₂O+Cs₂O] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of the total content [Li₂O+Na₂O+K₂O+Cs₂O] of Li₂O, Na₂O, K₂O, and Cs₂O is preferably 1.5%, and more preferably 2%, 4%, and 6% in this order. An upper limit of the total content is preferably 15%, and more preferably 13% and 10% in this order.

In order to obtain optical glass excellent in the melting properties, it is preferable that the total content [Li₂O+Na₂O+K₂O+Cs₂O] is in the range described above.

In the optical glass according to the third embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, K₂O, and Cs₂O is preferably 0.00, and more preferably 0.10, 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In the optical glass according to the third embodiment, an upper limit of the content of MgO is preferably 20%, and more preferably 15%, 10%, and 5% in this order. In addition, a lower limit of the content of MgO is preferably 0%.

In the optical glass according to the third embodiment, a lower limit of the content of CaO is preferably 1%, and more preferably 3%, 5%, and 8% in this order. An upper limit of the content of CaO is preferably 20%, and more preferably 18%, 15%, and 13% in this order.

In the optical glass according to the third embodiment, an upper limit of the content of SrO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of SrO is preferably 0%.

In the optical glass according to the third embodiment, the content of BaO is preferably 20% or less, and more preferably 17% or less, less than 16.0%, 15% or less, 13% or less, and 10% or less in this order. In addition, a lower limit of the content of BaO is preferably 0%.

By setting the content of BaO to be in the range described above, the melting properties of the glass can be improved, and the refractive index can be increased. On the other hand, in a case where the content of BaO is excessively high, the thermal stability may decrease, and the specific weight may increase.

In the optical glass according to the third embodiment, an upper limit of the content of ZnO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of ZnO is preferably 0%.

In the optical glass according to the third embodiment, an upper limit of the total content [MgO+CaO+SrO+BaO+ZnO] of MgO, CaO, SrO, BaO, and ZnO is preferably 40%, and more preferably 35%, 30%, and 25% in this order. In addition, a lower limit of the total content is preferably 3%, and more preferably 5%, 8%, and 10% in this order. From the viewpoint of suppressing an increase in the specific weight and of maintaining the thermal stability without hindering high dispersion, it is preferable that the total content is in the range described above.

In the optical glass according to the third embodiment, an upper limit of the content of Ta₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Ta₂O₅is preferably 0%.

In the optical glass according to the third embodiment, an upper limit of the content of La₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of La₂O₃is preferably 0%.

In the optical glass according to the third embodiment, an upper limit of the content of Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Y₂O₃is preferably 0%.

In the optical glass according to the third embodiment, the content of Sc₂O₃is preferably 2% or less. In addition, a lower limit of the content of Sc₂O₃is preferably 0%.

In the optical glass according to the third embodiment, the content of HfO₂is preferably 2% or less. In addition, a lower limit of the content of HfO₂is preferably 0%.

In the optical glass according to the third embodiment, the content of Lu₂O₃is preferably 2% or less. In addition, a lower limit of the content of Lu₂O₃is preferably 0%.

In the optical glass according to the third embodiment, the content of GeO₂is preferably 2% or less. In addition, a lower limit of the content of GeO₂is preferably 0%.

In the optical glass according to the third embodiment, an upper limit of the content of Gd₂O₃is preferably 3.0%, and more preferably 2.0%. In addition, a lower limit of the content of Gd₂O₃is preferably 0%.

In the optical glass according to the third embodiment, the content of Yb₂O₃is preferably 2% or less. In addition, a lower limit of the content of Yb₂O₃is preferably 0%.

In the optical glass according to the third embodiment, an upper limit of the total content [La₂O₃+Gd₂O₃+Y₂O₃] of La₂O₃, Gd₂O₃, and Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. A lower limit of the total content is 0%. The total content may be 0%.

In the optical glass according to the third embodiment, a lower limit of a mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] of the content Li₂O to the total content of the glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is preferably 0.00, and more preferably 0.02, 0.03, 0.04, 0.05, and 0.06 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.15, 0.13, and 0.10 in this order.

In the optical glass according to the third embodiment, a lower limit of a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] of the content of TiO₂to the total content of TiO₂, Nb₂O₅, WO₃, ZrO₂, SrO, BaO, ZnO, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, and Bi₂O₃is preferably 0.40, and more preferably 0.42, 0.44, 0.46, 0.48, and 0.50 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

It is preferable that the optical glass according to the third embodiment mainly contains the glass components described above, that is, SiO₂, TiO₂, and Nb₂O₅as an essential component, and Na₂O, P₂O₅, B₂O₃, Al₂O₃, ZrO₂, WO₃, Bi₂O₃, Li₂O, K₂O, Cs₂O, MgO, CaO, SrO, BaO, ZnO, Ta₂O₅, La₂O₃, Y₂O₃, Sc₂O₃, HfO₂, Lu₂O₃, GeO₂, Gd₂O₃, and Yb₂O₃as an arbitrary component, and the total content of the glass components described above is preferably 95% or more, more preferably 98% or more, even more preferably 99% or more, and still even more preferably 99.5% or more.

Note that, it is preferable that the optical glass according to the third embodiment basically contains the glass components described above, and other components can also be contained within a range not impairing the functions and the effects of the present invention. In addition, in the present invention, containing inevitable impurities is not excluded.

(Other Components)

All of Pb, As, Cd, Tl, Be, and Se have toxicity. Accordingly, it is particularly preferable that the optical glass according to the third embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

All of U, Th, and Ra are a radioactive element. Accordingly, it is particularly preferable that the optical glass according to the third embodiment does not contain such elements as the glass component. The content of each of the elements is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, and Tm increase the coloration of the glass, and can be a fluorescent light source. Accordingly, it is particularly preferable that the optical glass according to the third embodiment does not contain such elements as the glass component. The content of each of the elements is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

Sb(Sb₂O₃) and Ce(CeO₂) are an element that functions as a clarificant and can be added arbitrary. Among them, Sb(Sb₂O₃) is a clarificant having a high clarifying effect. Ce(CeO₂) has a clarifying effect lower than that of Sb(Sb₂O₃). In a case where Ce(CeO₂) is added in large amounts, the coloration of the glass tends to be thickened.

The content of Sb₂O₃is represented by an external ratio. That is, in the optical glass according to the third embodiment, the content of Sb₂O₃when the total content of all the glass components other than Sb₂O₃and CeO₂is 100% by mass is preferably 1% by mass or less, and more preferably 0.1% by mass or less, 0.05% by mass or less, and 0.03% by mass or less in this order. The content of Sb₂O₃may be 0% by mass.

The content of CeO₂is also represented by an external ratio. That is, in the optical glass according to the third embodiment, the content of CeO₂when the total content of all the glass components other than CeO₂and Sb₂O₃is 100% by mass is preferably 2% by mass or less, and more preferably 1% by mass or less, 0.5% by mass or less, and 0.1% by mass or less in this order. The content of CeO₂may be 0% by mass. By setting the content of CeO₂to be in the range described above, clarifying properties of the glass can be improved.

(Properties of Glass)

<Abbe's Number νd>

In the optical glass according to the third embodiment, an Abbe's number νd is preferably 15 to 30. The Abbe's number νd may be 18 to 25, or may be 20 to 24. By setting the Abbe's number νd to be in the range described above, glass having desired dispersivity can be obtained. The Abbe's number νd can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃, which are a glass component that contributes to high dispersion.

The optical glass according to the third embodiment is high-refractive index glass and has the specific weight that is not high. In a case where the specific weight of the glass can be reduced, the weight of a lens can be reduced. On the other hand, in a case where the specific weight is excessively low, a decrease in the thermal stability is caused.

Therefore, in the optical glass according to the third embodiment, the specific weight is preferably 4.2 or less, and more preferably 4.0 or less, 3.8 or less, 3.6 or less, and 3.4 or less in this order.

Note that, in the optical glass according to the third embodiment, the refractive index nd and the specific weight preferably satisfy Expression (1) described below, more preferably satisfy Expression (2) described below, and even more preferably satisfy Expression (3) described below. By the refractive index nd and the specific weight satisfying the following expressions, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

nd≥0.2×Specific Weight+1.18 (1)

nd≥0.2×Specific Weight+1.19 (2)

nd≥0.2×Specific Weight+1.20 (3)

In the optical glass according to the third embodiment, an upper limit of a glass transition temperature Tg is preferably 690° C., and more preferably 680° C., 660° C., 650° C., 630° C., and 600° C. in this order. A lower limit of the glass transition temperature Tg is not particularly limited, and is generally 500° C., and preferably 550° C.

The glass transition temperature Tg can be controlled by adjusting the total content of the alkali metals.

Light transmissivity of the optical glass according to the third embodiment can be evaluated by coloration degrees λ80, λ70, and λ5.

λ80 of the optical glass according to the third embodiment is preferably 700 nm or less, more preferably 650 nm or less, and even more preferably 600 nm or less.

λ70 is preferably 600 nm or less, more preferably 550 nm or less, and even more preferably 500 nm or less.

λ5 is preferably 500 nm or less, more preferably 450 nm or less, and even more preferably 400 nm or less.

(Manufacturing of Optical Glass)

The glass raw material may be blended to have the predetermined composition described above, and the optical glass according to the third embodiment may be prepared by the blended glass raw materials in accordance with a known glass manufacturing method. For example, a plurality of types of compounds are blended and sufficiently mixed to be a batch raw material, and the batch raw material is put in a quartz crucible or a platinum crucible and roughly melted. A melted product obtained by the rough melting is rapidly cooled and pulverized to prepare cullet. Further, the cullet is put in a platinum crucible and heated and remelted to be molten glass, and the molten glass is further clarified and homogenized, and then, is molded and gradually cooled to obtain optical glass. A known method may be applied to the molding and the gradual cooling of the molten glass.

(Manufacturing of Optical Element and Others)

A known method may be applied to the preparation of an optical element by using the optical glass according to the third embodiment. For example, in the manufacturing of the optical glass, the molten glass is cast into a mold and molded into the shape of a plate, and a glass material including the optical glass according to the present invention is prepared. The obtained glass material is suitably cut, ground, and polished, and a cut piece having a size and a shape suitable for press molding is prepared. The cut piece is heated and softened, and is press-molded (reheat-pressed) by a known method, and an optical element blank having a shape similar to the shape of the optical element is prepared. The optical element blank is annealed, and is ground and polished by a known method, and an optical element is prepared.

An optical functional surface of the prepared optical element may be coated with an antireflective film, a total reflection film, and the like, in accordance with the intended use.

According to one aspect of the present invention, an optical element including the optical glass described above can be provided. As the type of optical element, a lens such as a planar lens, a spherical lens, and an aspherical lens, a prism, a diffraction grating, a light guide plate, and the like can be exemplified. As the shape of the lens, various shapes such as a biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex meniscus lens, and a concave meniscus lens can be exemplified. As the use of the light guide plate, a display device such as an augmented reality (AR) display type spectacle type device or a mixed reality (MR) display type spectacle type device, and the like can be exemplified. Such a light guide plate is a plate-shaped glass that can be attached to the frame of the spectacle type device, and includes the optical glass described above. A diffraction grating for changing a traveling direction of light that is propagated through the light guide plate by repeating total reflection may be formed on the surface of the light guide plate, as necessary. The diffraction grating can be formed by a known method. In a case of wearing a spectacle type device including the light guide plate, the light that is propagated through the light guide plate is incident on the pupils, and thus, the function of augmented reality (AR) display or mixed reality (MR) display is exhibited. Such a spectacle type device, for example, is disclosed in JP Patent Application Laid Open (Translation of PCT Application) No. 2017-534352 and the like. Note that, the light guide plate can be prepared by a known method. The optical element can be manufactured by a method including a step of processing a glass molded body containing the optical glass. As the processing, severing, cutting, rough grinding, fine grinding, polishing, and the like can be exemplified. By using the glass when performing such processing, a damage can be reduced, and a high-quality optical element can be stably supplied.

(Image Display Device)

An image display device according to the third embodiment can be the same as that of the first embodiment.

Fourth Embodiment

Optical glass according to a fourth embodiment,

in which a mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] of a content of Li₂O to a total content of glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is 0.02 or more,

a refractive index nd is 1.86 or more.

In the optical glass according to the fourth embodiment, the mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] of the content of Li₂O to the total content of the glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is 0.02 or more. A lower limit of the mass ratio is preferably 0.03, and more preferably 0.04, 0.05, and 0.06 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.15, 0.13, and 0.10 in this order.

Note that, the total content of all the glass components is 100% by mass. Therefore, the total content of the glass components other than SiO₂, B₂O₃, P₂O₅, and GeO₂is represented by [100−(SiO₂+B₂O₃+P₂O₅+GeO₂)]. By setting the mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] to be in the range described above, optical glass having a high refractive index and a reduced specific weight can be obtained.

In the optical glass according to the fourth embodiment, the mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] of the content of TiO₂to the total content of TiO₂, Nb₂O₅, WO₃, ZrO₂, SrO, BaO, ZnO, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, and Bi₂O₃is 0.40 or more. A lower limit of the mass ratio is preferably 0.42, and more preferably 0.44, 0.46, 0.48, and 0.50 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

By setting the mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] to be in the range described above, the refractive index can be increased while suppressing an increase in the specific weight.

Non-restrictive examples of the content and the ratio of glass components other than the above in the optical glass according to the fourth embodiment will be described.

In the optical glass according to the fourth embodiment, a lower limit of the content of SiO₂is preferably 10%, and more preferably 12%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of SiO₂is preferably 40%, and more preferably 38%, 35%, 33%, and 30% in this order.

SiO₂is a network-forming component of the glass. In order to improve thermal stability, chemical durability, and weather resistance of the glass, and to improve the viscosity of molten glass, it is preferable that the content of SiO₂is in the range described above. In a case where the content of SiO₂is excessively high, the refractive index of the glass may decrease, and desired optical properties may not be obtained.

In the optical glass according to the fourth embodiment, an upper limit of the content of P₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of P₂O₅may be 0%.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the content of P₂O₅is in the range described above.

In the optical glass according to the fourth embodiment, an upper limit of the content of B₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of B₂O₃is preferably 0%, and more preferably 0.5%, 0.8%, and 1.0% in this order.

In the optical glass according to the fourth embodiment, an upper limit of the content of Al₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of Al₂O₃may be 0%.

In the optical glass according to the fourth embodiment, a lower limit of the total content [SiO₂+Al₂O₃] of SiO₂and Al₂O₃is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, 35%, and 30% in this order.

In order to increase the thermal stability of the glass, it is preferable that the total content [SiO₂+Al₂O₃] is in the range described above.

In the optical glass according to the fourth embodiment, a lower limit of a mass ratio [B₂O₃/(SiO₂+Al₂O₃)] of the content of B₂O₃to the total content of SiO₂and Al₂O₃is preferably 0.01, and more preferably 0.02, 0.03, and 0.04 in this order. An upper limit of the mass ratio is preferably 0.20, and more preferably 0.18, 0.15, 0.13, and 0.10 in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the mass ratio [B₂O₃/(SiO₂+Al₂O₃)] is in the range described above.

In the optical glass according to the fourth embodiment, a lower limit of the total content [B₂O₃+P₂O₅] of B₂O₃and P₂O₅is preferably 0.5%, and more preferably 0.8% and 1.0% in this order. In addition, an upper limit of the total content is preferably 10%, and more preferably 8%, 5%, and 3% in this order.

From the viewpoint of improving the chemical durability and the thermal stability, it is preferable that the total content [B₂O₃+P₂O₅] is in the range described above.

In the optical glass according to the fourth embodiment, a lower limit of the total content [B₂O₃+SiO₂] of B₂O₃and SiO₂is preferably 10%, and more preferably 15%, 18%, and 20% in this order. In addition, an upper limit of the total content is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In order to obtain optical glass having a high refractive index, it is preferable that the total content [B₂O₃+SiO₂] is in the range described above.

In the optical glass according to the fourth embodiment, a lower limit of the content of ZrO₂is preferably 0%, and more preferably 0.10%, 0.5%, and 1.0% in this order. In addition, an upper limit of the content of ZrO₂is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of ZrO₂may be 0%.

In the optical glass according to the fourth embodiment, a lower limit of the content of TiO₂is preferably 10%, and more preferably 13%, 15%, 18%, and 20% in this order. In addition, an upper limit of the content of TiO₂is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In the optical glass according to the fourth embodiment, a lower limit of the content of Nb₂O₅is preferably 10%, and more preferably 13% and 15% in this order. In addition, an upper limit of the content of Nb₂O₅is preferably 50%, and more preferably 45%, 40%, and 35% in this order.

In the optical glass according to the fourth embodiment, a lower limit of the total content [TiO₂+Nb₂O₅] of TiO₂and Nb₂O₅is preferably 20%, and more preferably 25%, 30%, and 35% in this order. In addition, an upper limit of the total content is preferably 70%, and more preferably 65%, 60%, and 55% in this order.

In the optical glass according to the fourth embodiment, a lower limit of a mass ratio [TiO₂/(TiO₂+Nb₂O₅)] of the content of TiO₂to the total content of TiO₂and Nb₂O₅is preferably 0.20, and more preferably 0.25, 0.30, and 0.35 in this order. An upper limit of the mass ratio is preferably 0.80, and more preferably 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [TiO₂/(TiO₂+Nb₂O₅)] is in the range described above.

In the optical glass according to the fourth embodiment, an upper limit of the content of WO₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. The content of WO₃may be 0%.

In the optical glass according to the fourth embodiment, an upper limit of the content of Bi₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Bi₂O₃is preferably 0%. The content of Bi₂O₃may be 0%.

In the optical glass according to the fourth embodiment, an upper limit of the total content [TiO₂+Nb₂O₅+WO₃+Bi₂O₃] of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃is preferably 80%, and more preferably 70% and 60% in this order. In addition, a lower limit of the total content is preferably 20%, and more preferably 25%, 30%, and 35% in this order.

In the optical glass according to the fourth embodiment, a lower limit of the content of Li₂O is preferably 0.1%, and more preferably 0.3%, 0.5%, 0.8%, 1.0%, 1.3%, and 1.5% in this order. An upper limit of the content of Li₂O is preferably 10%, and more preferably 9%, 8%, 7%, 6%, and 5% in this order.

In the optical glass according to the fourth embodiment, an upper limit of the content of Na₂O is preferably 10%, and more preferably 9%, 8%, and 7% in this order. A lower limit of the content of Na₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order.

In the optical glass according to the fourth embodiment, an upper limit of the content of K₂O is preferably 10%, and more preferably 8% and 5% in this order. A lower limit of the content of K₂O is preferably 0%, and more preferably 0.5%, 1.0%, 1.5%, and 2.0% in this order. The content of K₂O may be 0%.

Na₂O and K₂O have a function of improving the melting properties of the glass. On the other hand, in a case where the contents of Na₂O and K₂O are excessively high, the refractive index may decrease, and the thermal stability may decrease. Accordingly, it is preferable that the contents of Na₂O and K₂O are in the ranges described above, respectively.

In the optical glass according to the fourth embodiment, an upper limit of the content of Cs₂O is preferably 5%, and more preferably 3% and 1% in this order. A lower limit of the content of Cs₂O is preferably 0%.

In the optical glass according to the fourth embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, and K₂O is preferably 0.10, and more preferably 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In order to obtain optical glass having a high refractive index and a reduced specific weight, it is preferable that the mass ratio [Li₂O/(Li₂O+Na₂O+K₂O)] is in the range described above.

In the optical glass according to the fourth embodiment, a lower limit of a mass ratio [Li₂O/(Li₂O+Na₂O+K₂O+Cs₂O)] of the content of Li₂O to the total content of Li₂O, Na₂O, K₂O, and Cs₂O is preferably 0.10, and more preferably 0.15, 0.20, and 0.25 in this order. An upper limit of the mass ratio is preferably 1.00, and more preferably 0.80, 0.75, 0.70, and 0.65 in this order.

In the optical glass according to the fourth embodiment, a lower limit of the total content [Na₂O+K₂O+Cs₂O] of Na₂O, K₂O, and Cs₂O is preferably 0%. An upper limit of the total content is preferably 11.0%, and more preferably 10.0%, 9.0%, 8.0%, 7.0%, and 6.0% in this order.

In order to maintain a high refractive index while maintaining the thermal stability of the glass, it is preferable that the total content [Na₂O+K₂O+Cs₂O] is in the range described above.

In the optical glass according to the fourth embodiment, a lower limit of the total content [Li₂O+Na₂O+K₂O+Cs₂O] of Li₂O, Na₂O, K₂O, and Cs₂O is preferably 1.5%, and more preferably 2%, 4%, and 6% in this order. An upper limit of the total content is preferably 15%, and more preferably 13% and 10% in this order.

In order to obtain optical glass excellent in the melting properties, it is preferable that the total content [Li₂O+Na₂O+K₂O+Cs₂O] is in the range described above.

In the optical glass according to the fourth embodiment, an upper limit of the content of MgO is preferably 20%, and more preferably 15%, 10%, and 5% in this order. In addition, a lower limit of the content of MgO is preferably 0%.

In the optical glass according to the fourth embodiment, a lower limit of the content of CaO is preferably 1%, and more preferably 3%, 5%, and 8% in this order. An upper limit of the content of CaO is preferably 20%, and more preferably 18%, 15%, and 13% in this order.

In the optical glass according to the fourth embodiment, an upper limit of the content of SrO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of SrO is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the content of BaO is preferably 20%, and more preferably 17%, 15%, 13%, and 10% in this order. In addition, a lower limit of the content of BaO is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the content of ZnO is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of ZnO is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the total content [MgO+CaO+SrO+BaO+ZnO] of MgO, CaO, SrO, BaO, and ZnO is preferably 40%, and more preferably 35%, 30%, and 25% in this order. In addition, a lower limit of the total content is preferably 3%, and more preferably 5%, 8%, and 10% in this order. From the viewpoint of suppressing an increase in the specific weight and of maintaining the thermal stability without hindering high dispersion, it is preferable that the total content is in the range described above.

In the optical glass according to the fourth embodiment, an upper limit of the content of Ta₂O₅is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Ta₂O₅is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the content of La₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of La₂O₃is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the content of Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. In addition, a lower limit of the content of Y₂O₃is preferably 0%.

In the optical glass according to the fourth embodiment, the content of Sc₂O₃is preferably 2% or less. In addition, a lower limit of the content of Sc₂O₃is preferably 0%.

In the optical glass according to the fourth embodiment, the content of HfO₂is preferably 2% or less. In addition, a lower limit of the content of HfO₂is preferably 0%.

In the optical glass according to the fourth embodiment, the content of Lu₂O₃is preferably 2% or less. In addition, a lower limit of the content of Lu₂O₃is preferably 0%.

In the optical glass according to the fourth embodiment, the content of GeO₂is preferably 2% or less. In addition, a lower limit of the content of GeO₂is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the content of Gd₂O₃is preferably 3.0%, and more preferably 2.0%. In addition, a lower limit of the content of Gd₂O₃is preferably 0%.

In the optical glass according to the fourth embodiment, the content of Yb₂O₃is preferably 2% or less. In addition, a lower limit of the content of Yb₂O₃is preferably 0%.

In the optical glass according to the fourth embodiment, an upper limit of the total content [La₂O₃+Gd₂O₃+Y₂O₃] of La₂O₃, Gd₂O₃, and Y₂O₃is preferably 10%, and more preferably 8%, 5%, and 3% in this order. A lower limit of the total content is 0%. The total content may be 0%.

It is preferable that the optical glass according to the fourth embodiment mainly contains the glass components described above, that is, Li₂O and TiO₂as an essential component, and SiO₂, P₂O₅, B₂O₃, Al₂O₃, ZrO₂, Nb₂O₅, WO₃, Bi₂O₃, Na₂O, K₂O, Cs₂O, MgO, CaO, SrO, BaO, ZnO, Ta₂O₅, La₂O₃, Y₂O₃, Sc₂O₃, HfO₂, Lu₂O₃, GeO₂, Gd₂O₃, and Yb₂O₃as an arbitrary component, and the total content of the glass components described above is preferably 95% or more, more preferably 98% or more, even more preferably 99% or more, and still even more preferably 99.5% or more.

Note that, it is preferable that the optical glass according to the fourth embodiment basically contains the glass components described above, and other components can also be contained within a range not impairing the functions and the effects of the present invention. In addition, in the present invention, containing inevitable impurities is not excluded.

(Other Components)

All of Pb, As, Cd, Tl, Be, and Se have toxicity. Accordingly, it is particularly preferable that the optical glass according to the fourth embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

All of U, Th, and Ra are a radioactive element. Accordingly, it is particularly preferable that the optical glass according to the fourth embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, and Tm increase the coloration of the glass, and can be a fluorescent light source. Accordingly, it is particularly preferable that the optical glass according to the fourth embodiment does not contain such elements as the glass component. The content of each of the elements described above is preferably less than 0.5%, and more preferably less than 0.1%, less than 0.05%, and less than 0.01% in this order, in terms of an oxide.

The content of Sb₂O₃is represented by an external ratio. That is, in the optical glass according to the fourth embodiment, the content of Sb₂O₃when the total content of all the glass components other than Sb₂O₃and CeO₂is 100% by mass is preferably 1% by mass or less, and more preferably 0.1% by mass or less, 0.05% by mass or less, and 0.03% by mass or less in this order. The content of Sb₂O₃may be 0% by mass.

The content of CeO₂is also represented by an external ratio. That is, in the optical glass according to the fourth embodiment, the content of CeO₂when the total content of all the glass components other than CeO₂and Sb₂O₃is 100% by mass is preferably 2% by mass or less, and more preferably 1% by mass or less, 0.5% by mass or less, and 0.1% by mass or less in this order. The content of CeO₂may be 0% by mass. By setting the content of CeO₂to be in the range described above, clarifying properties of the glass can be improved.

(Properties of Glass)

<Abbe's Number νd>

In the optical glass according to the fourth embodiment, an Abbe's number νd is preferably 15 to 30. The Abbe's number νd may be 18 to 25, or may be 20 to 24. By setting the Abbe's number νd to be in the range described above, glass having desired dispersivity can be obtained. The Abbe's number νd can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, and Bi₂O₃, which are a glass component that contributes to high dispersion.

In the optical glass according to the fourth embodiment, a lower limit of the refractive index nd is 1.86. The lower limit of the refractive index nd can also be 1.87, 1.88, 1.89, or 1.90. In addition, an upper limit of the refractive index nd can be 2.20, and can also be 2.15, 2.10, or 2.05. The refractive index can be controlled by adjusting the contents of TiO₂, Nb₂O₅, WO₃, Bi₂O₃, ZrO₂, La₂O₃, Gd₂O₃, Y₂O₃, and Ta₂O₅, which are a glass component that contributes to an increase in the refractive index.

The optical glass according to the fourth embodiment is high-refractive index glass and has the specific weight that is not high. In a case where the specific weight of the glass can be reduced, the weight of a lens can be reduced. On the other hand, in a case where the specific weight is excessively low, a decrease in the thermal stability is caused.

Therefore, in the optical glass according to the fourth embodiment, the specific weight is preferably 4.2 or less, and more preferably 4.0 or less, 3.8 or less, 3.6 or less, and 3.4 or less in this order.

Note that, in the optical glass according to the fourth embodiment, the refractive index nd and the specific weight preferably satisfy Expression (1) described below, more preferably satisfy Expression (2) described below, and even more preferably satisfy Expression (3) described below. By the refractive index nd and specific weight satisfying the following expressions, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

nd≥0.2×Specific Weight+1.18 (1)

nd≥0.2×Specific Weight+1.20 (2)

nd≥0.2×Specific Weight+1.22 (3)

In addition, in the optical glass according to the fourth embodiment, a ratio [Refractive Index nd/Specific Weight] of the refractive index nd to the specific weight is preferably 0.50 or more, more preferably 0.52 or more, and even more preferably 0.54 or more. By setting the ratio [Refractive Index nd/Specific Weight] to be in the range described above, optical glass having a high refractive index and a comparatively reduced specific weight can be obtained.

In the optical glass according to the fourth embodiment, an upper limit of a glass transition temperature Tg is preferably 660° C., and more preferably 650° C., 630° C., and 600° C. in this order. A lower limit of the glass transition temperature Tg is not particularly limited, and is generally 500° C., and preferably 550° C.

The glass transition temperature Tg can be controlled by adjusting the total content of the alkali metals.

Light transmissivity of the optical glass according to the fourth embodiment can be evaluated by coloration degrees λ80, λ70, and λ5.

A spectral transmittance of a glass sample having a thickness of 10.0 mm±0.1 mm is measured in a range of a wavelength 200 to 700 nm, and a wavelength at which an external transmittance is 80% is 80, a wavelength at which an external transmittance is 70% is λ70, and a wavelength at which an external transmittance is 5% is λ5.

λ80 of the optical glass according to the fourth embodiment is preferably 700 nm or less, more preferably 650 nm or less, and even more preferably 600 nm or less.

λ70 is preferably 600 nm or less, more preferably 550 nm or less, and even more preferably 500 nm or less.

λ5 is preferably 500 nm or less, more preferably 450 nm or less, and even more preferably 400 nm or less.

(Manufacturing of Optical Glass)

The glass raw materials may be blended to have the predetermined composition described above, and the optical glass according to the fourth embodiment may be prepared by the blended glass raw materials in accordance with a known glass manufacturing method. For example, a plurality of types of compounds are blended and sufficiently mixed to be a batch raw material, and the batch raw material is put in a quartz crucible or a platinum crucible and roughly melted. A melted product obtained by the rough melting is rapidly cooled and pulverized to prepare cullet. Further, the cullet is put in a platinum crucible and heated and remelted to be molten glass, and the molten glass is further clarified and homogenized, and then, is molded and gradually cooled to obtain optical glass. A known method may be applied to the molding and the gradual cooling of the molten glass.

(Manufacturing of Optical Element and Others)

A known method may be applied to the preparation of an optical element by using the optical glass according to the fourth embodiment. For example, in the manufacturing of the optical glass described above, the molten glass is cast into a mold and molded into the shape of a plate, and a glass material including the optical glass according to the present invention is prepared. The obtained glass material is suitably cut, ground, and polished, and a cut piece having a size and a shape suitable for press molding is prepared. The cut piece is heated and softened, and is press-molded (reheat-pressed) by a known method, and an optical element blank having a shape similar to the shape of the optical element is prepared. The optical element blank is annealed, and is ground and polished by a known method, and an optical element is prepared.

An optical functional surface of the prepared optical element may be coated with an antireflective film, a total reflection film, and the like, in accordance with the intended use.

According to one aspect of the present invention, an optical element including the optical glass described above can be provided. As the type of optical element, a lens such as a planar lens, a spherical lens, and an aspherical lens, a prism, a diffraction grating, a light guide plate, and the like can be exemplified. As the shape of the lens, various shapes such as a biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex meniscus lens, and a concave meniscus lens can be exemplified. As the use of the light guide plate, a display device such as an augmented reality (AR) display type spectacle type device or a mixed reality (MR) display type spectacle type device, and the like can be exemplified. Such a light guide plate is plate glass that can be attached to the frame of the spectacle type device, and includes the optical glass described above. A diffraction grating for changing a traveling direction of light that is propagated through the light guide plate by repeating total reflection may be formed on the surface of the light guide plate, as necessary. The diffraction grating can be formed by a known method. In a case of wearing a spectacle type device including the light guide plate, the light that is propagated through the light guide plate is incident on the pupils, and thus, the function of augmented reality (AR) display or mixed reality (MR) display is exhibited. Such a spectacle type device, for example, is disclosed in JP Patent Application Laid Open (Translation of PCT Application) No. 2017-534352 and the like. Note that, the light guide plate can be prepared by a known method. The optical element can be manufactured by a method including a step of processing a glass molded body containing the optical glass. As the processing, severing, cutting, rough grinding, fine grinding, polishing, and the like can be exemplified. By using the glass when performing such processing, a damage can be reduced, and a high-quality optical element can be stably supplied.

(Image Display Device)

An image display device according to the fourth embodiment can be the same as that of the first embodiment.

EXAMPLES

Hereinafter, the present invention will be described in more detail by Examples. Here, the present invention is not limited to the embodiments described in Examples.

Note that, Example 1 corresponds to the first embodiment, Example 2 corresponds to the second embodiment, Example 3 corresponds to the third embodiment, and Example 4 corresponds to the fourth embodiment.

Example 1
Example 1-1

Glass samples having glass compositions shown in Tables 1-1(1), 1-1(2), 1-1(3), and 1-1(4) were prepared by the following procedure, and various evaluations were performed.

[Manufacturing of Optical Glass]

First, an oxide, a hydroxide, a carbonate, and a nitrate corresponding to structural components of the glass were prepared as a raw material, the raw materials were weighed and blended such that a glass composition of optical glass to be obtained was each of the compositions shown in Tables 1-1(1), 1-1(2), 1-1(3), and 1-1(4), and the raw materials were sufficiently mixed. A blended raw material (a batch raw material) obtained as described above was put in a platinum crucible, and was heated at 1350° C. to 1400° C. for 2 hours to be molten glass, and the molten glass was stirred, homogenized, and clarified, and then, was cast into a mold that was preheated to a suitable temperature. The cast glass was subjected to a heat treatment at approximately a glass transition temperature Tg for 30 minutes, and was allowed to cool in a furnace to a room temperature, and thus, a glass sample was obtained.

[Check of Glass Component Composition]

In the obtained glass sample, the content of each glass component was measured by an inductively coupled plasma atomic emission spectrometry (ICP-AES), and it was checked that the content was as each of the compositions shown in Tables 1-1(1), 1-1(2), 1-1(3), and 1-1(4).

[Measurement of Optical Properties]

The obtained glass sample was further subjected to an annealing treatment at approximately the glass transition temperature Tg for approximately 30 minutes to 2 hours, and then, was cooled in the furnace to the room temperature at a temperature decrease rate of −30° C./hour, and thus, an annealed sample was obtained. In the obtained annealed sample, refractive indices nd, ng, nF, and nC, and an Abbe's number νd, a specific weight, the glass transition temperature Tg, λ80, λ70, and λ5 were measured. Results are shown in Tables 1-2(1), 1-2(2), 1-2(3), and 1-2(4).

(i) Refractive Indices nd, ng, nF, and nC and Abbe's Number νd

In the annealed sample, the refractive indices nd, ng, nF, and nC were measured by a refractive index measurement method of JIS standard JIS B 7071-1, and the Abbe's number νd was calculated on the basis of the following expression.

νd=(nd−1)/(nF−nC)

(ii) Specific Weight

The specific weight was measured by an Archimedes method.

(iii) Glass Transition Temperature Tg

The glass transition temperature Tg was measured at a temperature increase rate of 10° C./minute by using a differential scanning calorimetric analyzer (DSC3300SA), manufactured by NETZSCH Japan K.K.

(iv) λ80, λ70, and λ5

In the annealed sample having a thickness of 10.0 mm±0.1 mm, a spectral transmittance was measured in a range of a wavelength of 200 to 700 nm. A wavelength at which an external transmittance was 80% was λ80, a wavelength at which an external transmittance was 70% was λ70, and a wavelength at which an external transmittance was 5% was λ5.

TABLE 1-1(1)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

1-1
0
21.48
1.02
0
3.09
2.49
0
0
9.41
0
10.78
26.46

1-2
0
21.29
1.01
0
2.21
4.23
0
0
9.33
0
10.68
26.21

1-3
0
21.17
1
0
2.2
2.45
0
2.28
9.28
0
10.63
26.09

1-4
0
20.99
0.99
0
2.18
2.43
0
0
12.34
0
10.53
25.85

1-5
0
24.06
2.26
0
4.43
2.79
0
0
10.55
0
2.22
29.64

1-6
0
24.22
1.15
0
4.94
2.81
0
0
10.61
0
2.24
29.83

1-7
0
23.74
1.12
0
4.61
2.75
0
0
10.4
0
2.19
29.25

1-8
0
23.68
1.12
0
4.35
3.24
0
0
10.38
0
2.19
29.17

1-9
0
23.65
1.12
0
4.35
2.74
0
0.65
10.36
0
2.18
29.12

1-10
0
23.59
1.12
0
4.34
2.73
0
0
11.23
0
2.18
29.04

1-11
0
24.22
1.15
0
4.92
2.8
0
0
10.61
0
0
29.84

1-12
0
24.11
1.14
0
4.68
2.79
0.68
0
10.56
0
0
29.7

1-13
0
26.33
1.15
0
4.95
2.82
0
0
10.68
0
0
27.44

1-14
0
24.58
2.31
0
4.99
2.85
0
0
10.77
0
0
27.64

1-15
0
26.8
1.17
0
5.04
2.87
0
0
10.87
0
0
30.55

1-16
0
25.02
2.35
0
5.08
2.9
0
0
10.96
0
0
30.8

1-17
0
28.98
1.18
0
5.07
2.89
0
0
10.94
0
0
28.09

1-18
0
27.06
1.18
1.71
5.08
2.9
0
0
10.97
0
0
28.18

1-19
0
27.39
1.2
0
5.65
2.94
0
0
11.11
0
0
28.51

1-20
0
27.01
1.18
0
5.08
2.9
0
0
12.83
0
0
28.12

1-21
0
27.24
1.19
0
5.12
3.96
0
0
11.05
0
0
28.37

1-22
0
29.5
1.2
0
5.16
2.94
0
0
11.14
0
0
31.31

1-23
0
29.38
1.2
0
5.64
2.93
0
0
9.2
0
0
28.48

1-24
0
29.34
1.2
0
4.63
3.97
0
0
11.08
0
0
31.13

1-25
0
30.04
1.22
0
5.26
3
0
0
11.34
0
0
34.64

1-26
0
22.31
1.15
0
4.92
2.81
0
0
12.44
0
0
29.87

1-27
0
23.9
1.13
0
4.38
2.77
0
0
12.26
0
0
29.44

1-28
0
23.59
1.12
0
3.85
2.73
0
0
13.87
0
0
29.06

1-29
0
24.74
1.17
0
5.52
2.86
0
0
10.84
0
0
27.84

1-30
0
23.73
1.12
0
3.87
2.75
2.99
0
10.4
0
0
29.22

1-31
0
22.49
1.16
0
4.96
3.84
0
0
10.71
0
0
30.13

1-32
0
24.42
1.16
0
4.96
3.84
0
0
8.87
0
0
30.07

1-33
0
25.96
1.14
0
4.64
2.78
0
0
10.53
1.66
0
27.03

1-34
0
25.75
1.13
0
4.6
2.76
0
0
10.45
0
2.44
26.82

1-35
0
25.88
1.13
0
4.62
2.77
0
0
10.5
0
0
26.96

1-36
0
25.89
1.13
0
4.86
2.77
0
0
10.5
0
0
24.4

1-37
0
25.84
1.13
0
3.87
3.21
2.44
0
10.48
0
0
26.9

1-38
0
25.62
1.12
0
3.07
4.78
2.42
0
10.39
0
0
26.69

1-39
0
25.41
1.11
0
2.28
6.31
2.4
0
10.31
0
0
26.48

1-40
0
25.21
1.1
0
1.51
7.83
2.38
0
10.22
0
0
26.26

1-41
0
25.46
1.11
0
4.78
2.73
0
0
10.32
0
0
21.48

1-42
0
25.04
1.1
0
4.71
2.68
0
0
10.15
0
0
18.66

1-43
0
26.05
1.14
0
4.68
1.62
2.46
0
10.57
0
0
27.13

1-44
0
26.27
1.15
0
5.51
0
2.48
0
10.66
0
0
27.36

1-45
1.15
26.1
1.14
0
4.66
2.8
0
0
10.58
0
0
27.18

1-46
0
26.18
1.15
0.83
4.68
2.81
0
0
10.62
0
0
27.26

1-47
0
25.86
1.13
0
4.62
2.77
0
0
10.49
0.83
1.23
26.92

1-48
0
25.2
1.1
0
4.27
2.7
0
0
10.22
0
4.78
26.24

1-49
0
24.67
1.08
0
3.95
2.64
0
0
10
0
7.01
25.7

1-50
0
26.26
1.13
0
4.61
2.77
0
0
10.46
0
2.45
26.23

1-51
0
26.39
1.13
0
4.63
2.78
0
0
10.51
0
2.46
26.97

1-52
0
25.87
1.13
0
4.67
2.77
0
0
10.49
0
1.96
26.95

1-53
0
25.62
1.12
0
4.34
2.75
0.75
0
10.39
0
2.43
26.69

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

1-1
23.47
1.8
0
0
0
0
0
100
0.03

1-2
23.26
1.78
0
0
0
0
0
100
0.03

1-3
23.13
1.77
0
0
0
0
0
100
0.03

1-4
22.93
1.76
0
0
0
0
0
100
0.03

1-5
22.03
2.02
0
0
0
0
0
100
0.03

1-6
22.17
2.03
0
0
0
0
0
100
0.03

1-7
25.94
0
0
0
0
0
0
100
0.03

1-8
25.87
0
0
0
0
0
0
100
0.03

1-9
25.83
0
0
0
0
0
0
100
0.03

1-10
25.77
0
0
0
0
0
0
100
0.03

1-11
26.46
0
0
0
0
0
0
100
0.03

1-12
26.34
0
0
0
0
0
0
100
0.03

1-13
26.63
0
0
0
0
0
0
100
0.03

1-14
26.86
0
0
0
0
0
0
100
0.03

1-15
22.7
0
0
0
0
0
0
100
0.03

1-16
22.89
0
0
0
0
0
0
100
0.03

1-17
22.85
0
0
0
0
0
0
100
0.03

1-18
22.92
0
0
0
0
0
0
100
0.03

1-19
23.2
0
0
0
0
0
0
100
0.03

1-20
22.88
0
0
0
0
0
0
100
0.03

1-21
23.07
0
0
0
0
0
0
100
0.03

1-22
18.75
0
0
0
0
0
0
100
0.03

1-23
23.17
0
0
0
0
0
0
100
0.03

1-24
18.65
0
0
0
0
0
0
100
0.03

1-25
14.5
0
0
0
0
0
0
100
0.03

1-26
26.5
0
0
0
0
0
0
100
0.03

1-27
26.12
0
0
0
0
0
0
100
0.03

1-28
25.78
0
0
0
0
0
0
100
0.03

1-29
27.03
0
0
0
0
0
0
100
0.03

1-30
25.92
0
0
0
0
0
0
100
0.03

1-31
26.71
0
0
0
0
0
0
100
0.03

1-32
26.68
0
0
0
0
0
0
100
0.03

1-33
26.26
0
0
0
0
0
0
100
0.03

1-34
26.05
0
0
0
0
0
0
100
0.03

1-35
26.17
1.97
0
0
0
0
0
100
0.03

1-36
30.45
0
0
0
0
0
0
100
0.03

1-37
26.13
0
0
0
0
0
0
100
0.03

1-38
25.91
0
0
0
0
0
0
100
0.03

1-39
25.7
0
0
0
0
0
0
100
0.03

1-40
25.49
0
0
0
0
0
0
100
0.03

1-41
34.12
0
0
0
0
0
0
100
0.03

1-42
37.66
0
0
0
0
0
0
100
0.03

1-43
26.35
0
0
0
0
0
0
100
0.03

1-44
26.57
0
0
0
0
0
0
100
0.03

1-45
26.39
0
0
0
0
0
0
100
0.03

1-46
26.47
0
0
0
0
0
0
100
0.03

1-47
26.15
0
0
0
0
0
0
100
0.03

1-48
25.49
0
0
0
0
0
0
100
0.03

1-49
24.95
0
0
0
0
0
0
100
0.03

1-50
26.09
0
0
0
0
0
0
100
0.03

1-51
25.13
0
0
0
0
0
0
100
0.03

1-52
26.16
0
0
0
0
0
0
100
0.03

1-53
25.91
0
0
0
0
0
0
100
0.03

TABLE 1-1(2)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

1-54
0
25.69
1.12
0
4.59
2.26
0.75
0
10.42
0
2.43
26.76

1-55
0.28
25.68
1.12
0
4.59
2.75
0
0
10.42
0
2.43
26.76

1-56
0
26.41
1.13
0
4.63
2.78
0
0
10.51
0
0
26.36

1-57
0
26.51
1.14
0
4.65
2.79
0
0
10.56
0
0
27.11

1-58
0
25.75
1.13
0
4.84
1.77
0.75
0
10.45
0
2.44
26.82

1-59
0
25.62
1.12
0
4.58
1.76
1.49
0
10.39
0
2.43
26.69

1-60
0
26.61
0.57
0
4.58
2.75
0
0
10.4
0
2.43
26.72

1-61
0
24.9
1.69
0
4.62
2.77
0
0
10.49
0
2.45
26.93

1-62
0
25.84
0.58
0
4.86
2.77
0
0
10.48
0
2.45
26.9

1-63
0
25.67
0.57
0
4.59
2.75
0
0
11.3
0
2.43
26.73

1-64
0
25.14
1.1
0
4.26
2.21
0.73
0
10.19
0
4.77
26.18

1-65
0
25.8
1.13
0
4.61
2.27
0.75
0
10.46
0
2.45
27.5

1-66
0
16.53
0.93
0
2.05
2.28
0
0
8.63
0
17.95
28.46

1-67
0
19.4
0.92
0
2.02
0.64
0
0
8.5
0
17.68
28.03

1-68
0
20.71
0.98
0
2.15
2.4
0
0
9.07
0
10.39
29.94

1-69
0
20.12
0.95
0
2.09
2.33
0
0
8.82
0
10.1
24.78

1-70
0
16.12
0.91
0
2
0.63
0
0
8.41
0
17.5
31.84

1-71
0
16.71
0.94
0
2.47
0.66
0
0
8.72
0
14.07
33.01

1-72
0
16.71
0.94
0
2.07
2.31
0
0
8.72
0
9.99
28.77

1-73
0
16.35
0.92
0
2.22
0.64
0
0
8.53
0
17.75
32.31

1-74
0
16.06
0.9
0
1.99
0.63
0
0
8.38
0
19.42
31.72

1-75
0
25.76
1.13
0
4.6
2.27
0.75
0
10.45
0
0
27.46

1-76
0
25.1
1.1
0
4.25
2.21
0.73
0
10.18
0
2.38
26.14

1-77
0
25.06
1.1
0
4.25
2.21
0.73
0
10.16
0
0
26.09

1-78
0
24.8
1.09
0
4.2
2.18
0.72
0
10.06
0
4.7
25.82

1-79
0
25.62
1.12
0
4.58
2.26
0.75
0
10.39
0
2.43
26.04

1-80
0
25.84
1.13
0
4.62
2.27
0.75
0
10.48
0
2.45
27.54

1-81
0
24.97
1.09
0
4.23
2.2
0.73
0
10.13
0
4.73
24.77

1-82
0
25.17
1.1
0
4.27
2.22
0.73
0
10.21
0
4.77
26.22

1-83
0
25.68
1.12
0
4.59
2.26
0.75
0
10.42
0
0
27.38

1-84
0
25.96
1.14
0
4.64
2.29
0.76
0
10.53
0
0
27.68

1-85
0
25.03
1.1
0
4.24
2.2
0.73
0
10.15
0
2.37
26.07

1-86
0
25.3
1.11
0
4.29
2.23
0.74
0
10.26
0
2.4
26.33

1-87
0
25.97
0.56
0
4.24
2.2
0.73
0
10.15
0
4.75
26.08

1-88
0
24.3
1.65
0
4.28
2.22
0.73
0
10.23
0
4.78
26.29

1-89
0
23.45
2.2
0
4.29
2.23
0.74
0
10.28
0
4.8
26.39

1-90
0
25.5
1.11
0
4.29
2.23
0.74
0
10.27
0
2.4
26.1

1-91
0
25.54
1.11
0
4.3
2.23
0.74
0
10.28
0
2.4
26.41

1-92
0
25.32
1.11
0
4.29
2.23
0.74
0
10.53
0
2.4
26

1-93
0
25.39
1.11
0
4.3
2.23
0.74
0
10.56
0
2.41
26.44

1-94
0
25.32
1.11
0
4.36
2.23
0.74
0
10.27
0
3.12
26.54

1-95
0
26.82
1.09
0
3.84
2.2
0.73
0
10.12
0
3.08
26.17

1-96
0
25.19
1.1
0
3.87
3.18
0.73
0
10.22
0
3.1
26.43

1-97
0
23.65
1.12
0
4.4
3.23
0.74
0
10.36
0
3.15
26.8

1-98
0
26.85
1.13
0
4.62
2.28
0.75
0
10.5
0
2.45
26.31

1-99
0
27.07
1.14
0
4.66
2.3
0.76
0
10.59
0
2.47
27.83

1-100
0
18.82
0.89
0
1.62
0
0
0
8.25
2.32
17.16
28.8

1-101
0
15.03
0.85
0
1.55
0
0
0
6.5
2.21
16.32
27.41

1-102
0
14.89
0.84
0
1.18
0
0
0
7.77
2.18
16.16
27.14

1-103
0
14.55
0.82
0
0.63
0
0
0
7.59
2.14
15.8
29.29

1-104
0
14.29
0.81
0
0.62
0
0
0
7.46
2.1
15.51
26.04

1-105
0
14.7
0.83
0
0
2.41
0
0
7.67
2.16
15.96
26.8

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

1-54
25.98
0
0
0
0
0
0
100
0.03

1-55
25.97
0
0
0
0
0
0
100
0.03

1-56
26.21
1.97
0
0
0
0
0
100
0.03

1-57
25.26
1.98
0
0
0
0
0
100
0.03

1-58
26.05
0
0
0
0
0
0
100
0.03

1-59
25.92
0
0
0
0
0
0
100
0.03

1-60
25.94
0
0
0
0
0
0
100
0.03

1-61
26.15
0
0
0
0
0
0
100
0.03

1-62
26.12
0
0
0
0
0
0
100
0.03

1-63
25.96
0
0
0
0
0
0
100
0.03

1-64
25.42
0
0
0
0
0
0
100
0.03

1-65
25.03
0
0
0
0
0
0
100
0.03

1-66
21.52
1.65
0
0
0
0
0
100
0.03

1-67
21.19
1.62
0
0
0
0
0
100
0.03

1-68
22.63
1.73
0
0
0
0
0
100
0.03

1-69
29.13
1.68
0
0
0
0
0
100
0.03

1-70
20.98
1.61
0
0
0
0
0
100
0.03

1-71
21.75
1.67
0
0
0
0
0
100
0.03

1-72
28.82
1.67
0
0
0
0
0
100
0.03

1-73
21.28
0
0
0
0
0
0
100
0.03

1-74
20.9
0
0
0
0
0
0
100
0.03

1-75
24.99
0
0
0
0
2.59
0
100
0.03

1-76
25.38
0
0
0
0
2.53
0
100
0.03

1-77
25.35
0
0
0
0
5.05
0
100
0.03

1-78
23.04
0
0
3.39
0
0
0
100
0.03

1-79
24.86
1.95
0
0
0
0
0
100
0.03

1-80
22.95
1.97
0
0
0
0
0
100
0.03

1-81
25.25
1.9
0
0
0
0
0
100
0.03

1-82
23.39
1.92
0
0
0
0
0
100
0.03

1-83
24.92
0
0
0
2.88
0
0
100
0.03

1-84
25.19
0
0
0
0
0
1.81
100
0.03

1-85
25.31
0
0
0
2.8
0
0
100
0.03

1-86
25.57
0
0
0
0
0
1.77
100
0.03

1-87
25.32
0
0
0
0
0
0
100
0.03

1-88
25.52
0
0
0
0
0
0
100
0.03

1-89
25.62
0
0
0
0
0
0
100
0.03

1-90
25.59
0
0
0
0
0
1.77
100
0.03

1-91
25.22
0
0
0
0
0
1.77
100
0.03

1-92
25.61
0
0
0
0
0
1.77
100
0.03

1-93
25.05
0
0
0
0
0
1.77
100
0.03

1-94
25.29
0
0
0
0
1.02
0
100
0.03

1-95
24.94
0
0
0
0
1.01
0
100
0.03

1-96
25.17
0
0
0
0
1.01
0
100
0.03

1-97
25.52
0
0
0
0
1.03
0
100
0.03

1-98
25.11
0
0
0
0
0
0
100
0.03

1-99
23.18
0
0
0
0
0
0
100
0.03

1-100
20.56
1.58
0
0
0
0
0
100
0.03

1-101
22.74
7.39
0
0
0
0
0
100
0.03

1-102
22.52
7.32
0
0
0
0
0
100
0.03

1-103
22.02
7.16
0
0
0
0
0
100
0.03

1-104
26.14
7.03
0
0
0
0
0
100
0.03

1-105
22.24
7.23
0
0
0
0
0
100
0.03

TABLE 1-1(3)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

1-106
0
25.67
1.12
0
4.11
3.24
0.75
0
10.41
0
2.43
27.37

1-107
0
25.54
1.12
0
3.62
4.2
0.74
0
10.36
0
2.42
27.22

1-108
0
25.54
1.12
0
4.09
2.25
2.23
0
10.36
0
2.42
27.21

1-109
0
27.32
1.11
0
4.07
2.24
0.74
0
10.31
0
2.41
27.12

1-110
0
26.02
1.14
0
4.65
2.29
0.76
0
10.55
0
2.47
29.01

1-111
0
25.85
1.13
0
4.38
2.28
0.75
0
11.38
0
2.45
28.83

1-112
0
25.6
1.12
0
3.87
2.25
2.98
0
10.83
0
1.21
27.3

1-113
0
27.28
1.15
0
4.7
2.32
0.77
0
11.13
0
1.25
28.04

1-114
0
27.04
1.14
0
4.66
2.3
0.76
0
11.03
0
1.24
26.52

1-115
0
25.86
1.13
0
4.62
1.29
2.26
0
10.94
0
1.23
27.57

1-116
0
25.73
1.13
0
4.6
0.29
3.75
0
10.88
0
1.22
27.43

1-117
0
25.66
1.12
0
4.11
2.26
0.75
0
12.63
0
1.22
27.35

1-118
0
26.1
1.13
0
4.32
2.28
0.75
0
11.39
0
1.23
28.84

1-119
0
25.88
1.13
0
4.27
2.53
0.75
0
11.39
0
1.23
28.85

1-120
0
25.88
1.13
0
4.32
2.28
0.94
0
11.39
0
1.23
28.86

1-121
0
25.88
1.13
0
4.38
2.03
1.13
0
11.39
0
1.23
28.86

1-122
0
26.2
1.15
0
4.68
2.31
0.76
0
11.54
0
0
27.93

1-123
0
26.1
1.14
0
4.66
2.3
0.76
0
10.59
0
0
29.12

1-124
0
25.99
1.14
0
4.64
2.29
0.76
0
10.54
0
0
28.35

1-125
0
25.88
1.13
0
4.62
2.28
0.75
0
10.5
0
0
27.6

1-126
0
26.32
1.15
0
4.7
2.32
0.77
0
11.59
0
0
28.7

1-127
0
26.88
1.13
0
4.39
2.28
0.75
0
10.51
0
0
28.92

1-128
0
27.37
1.13
0
4.63
1.54
0.75
0
10.51
0
0
28.92

1-129
0
26.49
1.15
0
4.68
2.31
0.76
0
10.62
0
0
29.22

1-130
0
27.24
1.11
0
4.52
2.23
0.74
0
10.26
0
2.4
26.96

1-131
0
28.66
1.09
0
4.43
2.18
0.72
0
10.06
0
2.35
26.44

1-132
0
31.28
1.05
0
4.27
2.1
0.7
0
9.69
0
2.26
25.47

1-133
0
27.75
1.13
0
4.14
2.27
0.75
0
11.37
0
0
27.53

1-134
0
25.93
1.14
0
4.15
2.28
2.27
0
11.42
0
0
27.65

1-135
0
26.07
1.14
0
4.66
1.3
2.28
0
11.48
0
0
27.78

1-136
0
25.8
1.13
0
4.13
1.28
3.76
0
11.36
0
0
27.51

1-137
0
27.61
1.13
0
4.59
2.26
0.75
0
11.32
0
0
27.4

1-138
0
26.55
1.16
0
4.74
2.34
0.77
0
11.69
0
0
26.99

1-139
0
26.78
1.17
0
4.79
2.36
0.78
0
11.79
0
0
28.55

1-140
0
26.81
1.13
0
4.14
2.27
0.75
0
12.27
0
0
27.56

1-141
0
26.12
1.71
0
4.43
2.3
0.76
0
11.5
0
0
27.84

1-142
0
26.2
1.71
0
4.44
2.31
0.76
0
11.54
0
0
27.94

1-143
0
26.24
1.15
0
4.69
2.31
0.76
0
11.55
0
0
27.99

1-144
0
25.99
1.6
0
4.7
2.31
0.77
0
11.11
0
0
28.02

1-145
0
26.72
1.17
0
4.78
2.35
0.78
0
11.76
0
0
26.51

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

1-106
24.9
0
0
0
0
0
0
100
0.03

1-107
24.78
0
0
0
0
0
0
100
0.03

1-108
24.78
0
0
0
0
0
0
100
0.03

1-109
24.68
0
0
0
0
0
0
100
0.03

1-110
23.11
0
0
0
0
0
0
100
0.03

1-111
22.95
0
0
0
0
0
0
100
0.03

1-112
24.84
0
0
0
0
0
0
100
0.03

1-113
23.36
0
0
0
0
0
0
100
0.03

1-114
25.31
0
0
0
0
0
0
100
0.03

1-115
25.1
0
0
0
0
0
0
100
0.03

1-116
24.97
0
0
0
0
0
0
100
0.03

1-117
24.9
0
0
0
0
0
0
100
0.03

1-118
22.97
0.99
0
0
0
0
0
100
0.03

1-119
22.98
0.99
0
0
0
0
0
100
0.03

1-120
22.98
0.99
0
0
0
0
0
100
0.03

1-121
22.98
0.99
0
0
0
0
0
100
0.03

1-122
25.43
0
0
0
0
0
0
100
0.03

1-123
25.33
0
0
0
0
0
0
100
0.03

1-124
26.29
0
0
0
0
0
0
100
0.03

1-125
27.24
0
0
0
0
0
0
100
0.03

1-126
24.45
0
0
0
0
0
0
100
0.03

1-127
25.14
0
0
0
0
0
0
100
0.03

1-128
25.15
0
0
0
0
0
0
100
0.03

1-129
24.77
0
0
0
0
0
0
100
0.03

1-130
24.54
0
0
0
0
0
0
100
0.03

1-131
24.07
0
0
0
0
0
0
100
0.03

1-132
23.18
0
0
0
0
0
0
100
0.03

1-133
25.06
0
0
0
0
0
0
100
0.03

1-134
25.16
0
0
0
0
0
0
100
0.03

1-135
25.29
0
0
0
0
0
0
100
0.03

1-136
25.03
0
0
0
0
0
0
100
0.03

1-137
24.94
0
0
0
0
0
0
100
0.03

1-138
25.76
0
0
0
0
0
0
100
0.03

1-139
23.78
0
0
0
0
0
0
100
0.03

1-140
25.07
0
0
0
0
0
0
100
0.03

1-141
25.34
0
0
0
0
0
0
100
0.03

1-142
23.27
0
0
0
0
0
1.83
100
0.03

1-143
23.31
2
0
0
0
0
0
100
0.03

1-144
25.5
0
0
0
0
0
0
100
0

1-145
25.93
0
0
0
0
0
0
100
0

TABLE 1-1(4)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

1-146
0
26.84
1.18
0
4.8
2.36
0.78
0
11.82
0
0
27.28

1-147
0
26.96
1.18
0
4.82
2.37
0.78
0
11.87
0
0
28.08

1-148
0
27.08
1.19
0
4.84
2.38
0.79
0
11.92
0
0
28.86

1-149
0
26.14
1.14
0
4.91
2.3
0.76
0
11.51
0
0
27.88

1-150
0
26.07
1.14
0
4.66
2.79
0.76
0
11.48
0
0
27.8

1-151
0
26.01
1.14
0
4.65
2.29
1.51
0
11.45
0
0
27.72

1-152
0
25.97
1.14
0
4.64
2.29
0.76
0
12.33
0
0
27.67

1-153
0
25.58
1.12
0
4.57
2.25
0.74
0
10.37
0
2.42
26.02

1-154
0
25.37
1.11
0
4.53
2.23
0.74
0
10.29
0
2.4
24.54

1-155
0
25.63
1.12
0
4.34
2.26
0.75
0
11.28
0
2.43
27.32

1-156
0
25.44
1.11
0
4.31
2.24
0.74
0
10.32
1.63
2.41
27.12

1-157
0
25.53
1.12
0
4.33
2.25
0.74
0
10.35
0
2.42
27.21

1-158
0
25.36
1.11
0
4.3
2.23
0.74
0
10.29
0
2.4
27.03

1-159
0
24.85
1.13
0
4.61
2.27
0.75
0
11.36
0
2.45
27.53

1-160
0
24.67
1.12
0
4.58
2.26
0.75
0
10.39
1.64
2.43
27.3

1-161
0
25.71
0.57
0
4.59
2.26
0.75
0
11.32
0
2.44
27.41

1-162
0
25.52
0.57
0
4.56
2.25
0.74
0
10.35
1.63
2.42
27.2

1-163
0
25.65
1.13
0
4.62
2.28
0.75
0
10.48
0
2.45
27.56

1-164
0
25.72
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44
27.68

1-165
0
25.69
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44
27.63

1-166
0
25.76
1.13
0
4.57
2.27
0.75
0
10.45
0
2.44
27.64

1-167
0
25.94
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44
27.45

1-168
0
25.51
1.13
0
4.63
2.28
0.75
0
10.5
0
2.45
27.62

1-169
0
25.9
1.13
0
4.61
2.27
0.75
0
10.47
0
2.45
27.38

1-170
0
25.59
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44
27.74

1-171
0
13.35
0.93
0
2.83
0.65
0
0
8.61
0
17.92
32.59

1-172
0
13.42
0.93
0
2.06
2.29
0
0
8.66
0
18.01
34.89

1-173
0
13.61
0.95
0
2.09
2.32
0
0
8.78
0
18.27
37.52

1-174
0
13.33
0.93
0
2.04
2.27
0
0
8.6
0
17.89
33.6

1-175
0
13.52
0.94
0
2.07
2.3
0
0
8.72
0
18.14
36.19

1-176
0
13.48
0.94
0
2.46
1.48
0
0
8.7
0
18.09
35.03

1-177
0
13.54
0.94
0
2.87
0.66
0
0
8.73
0
18.17
35.18

1-178
0
13.58
0.95
0
3.2
0
0
0
8.76
0
18.23
35.31

1-179
0
24.94
1.09
0
3.77
2.2
0.73
1.24
10.11
0
4.73
25.97

1-180
0
24.82
1.09
0
3.75
2.18
0.72
0
11.79
0
4.71
25.84

1-181
0
24.46
1.07
0
3.69
2.15
0.71
0
9.92
3.13
4.64
25.49

1-182
0
24.61
1.08
0
3.94
2.17
0.72
0
9.98
0
7
25.62

1-183
0
23.82
1.04
0
3.16
2.1
0.69
0
9.66
6.1
4.52
24.82

1-184
0
23.96
1.05
0
3.4
2.11
0.7
0
9.72
3.07
6.81
24.95

1-185
0
24.1
1.06
0
3.64
2.12
0.7
0
9.77
0
9.14
25.1

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

1-146
24.94
0
0
0
0
0
0
100
0

1-147
23.94
0
0
0
0
0
0
100
0

1-148
22.94
0
0
0
0
0
0
100
0

1-149
25.36
0
0
0
0
0
0
100
0

1-150
25.3
0
0
0
0
0
0
100
0

1-151
25.23
0
0
0
0
0
0
100
0

1-152
25.2
0
0
0
0
0
0
100
0

1-153
26.93
0
0
0
0
0
0
100
0.03

1-154
28.79
0
0
0
0
0
0
100
0.03

1-155
24.87
0
0
0
0
0
0
100
0.03

1-156
24.68
0
0
0
0
0
0
100
0.03

1-157
24.77
0
1.28
0
0
0
0
100
0.03

1-158
24.61
1.93
0
0
0
0
0
100
0.03

1-159
25.05
0
0
0
0
0
0
100
0.03

1-160
24.86
0
0
0
0
0
0
100
0.03

1-161
24.95
0
0
0
0
0
0
100
0.03

1-162
24.76
0
0
0
0
0
0
100
0.03

1-163
25.08
0
0
0
0
0
0
100
0.03

1-164
24.97
0
0
0
0
0
0
100
0.03

1-165
25.02
0
0
0
0
0
0
100
0.03

1-166
24.99
0
0
0
0
0
0
100
0.03

1-167
24.98
0
0
0
0
0
0
100
0.03

1-168
25.13
0
0
0
0
0
0
100
0.03

1-169
25.04
0
0
0
0
0
0
100
0.03

1-170
25.01
0
0
0
0
0
0
100
0.03

1-171
21.47
1.65
0
0
0
0
0
100
0.03

1-172
18.09
1.65
0
0
0
0
0
100
0.03

1-173
14.78
1.68
0
0
0
0
0
100
0.03

1-174
19.7
1.64
0
0
0
0
0
100
0.03

1-175
16.45
1.67
0
0
0
0
0
100
0.03

1-176
18.16
1.66
0
0
0
0
0
100
0.03

1-177
18.24
1.67
0
0
0
0
0
100
0.03

1-178
18.3
1.67
0
0
0
0
0
100
0.03

1-179
25.22
0
0
0
0
0
0
100
0.03

1-180
25.1
0
0
0
0
0
0
100
0.03

1-181
24.74
0
0
0
0
0
0
100
0.03

1-182
24.88
0
0
0
0
0
0
100
0.03

1-183
24.09
0
0
0
0
0
0
100
0.03

1-184
24.23
0
0
0
0
0
0
100
0.03

1-185
24.37
0
0
0
0
0
0
100
0.03

TABLE 1-2(1)

Glass composition

(% by mass)
Glass properties

Na₂O + K₂O +

Specific
Tg
λ80
λ70
λ5
nd − (0.2*Specific

No.
Cs₂O
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
Weight + 1.18)

1-1
2.49
1.92564
23.09
3.639
605
556
460
376
0.01784

1-2
4.23
1.91696
23.17
3.631
607
541
454
374
0.01076

1-3
2.45
1.92371
23.31
3.656
615
572
467
377
0.01251

1-4
2.43
1.92372
23.50
3.659
623
552
453
374
0.01192

1-5
2.79
1.91048

3.410
580
554
458
375
0.04848

1-6
2.81
1.91272
23.06
3.418
583
548
456
374
0.04912

1-7
2.75
1.92316
22.52
3.441
583
556
461
377
0.05496

1-8
3.24
1.92110

3.441

555
459
376
0.05290

1-9
2.74
1.92309

3.448

N/A
497
378
0.05349

1-10
2.73
1.92293
22.63
3.449

541
455
376
0.05313

1-11
2.80
1.92337

3.400
580
N/A
484
378
0.06337

1-12
3.47
1.91933

3.394
577
549
459
376
0.06053

1-13
2.82
1.90059
23.31
3.364
582
666
459
374
0.04779

1-14
2.85
1.90590
22.97
3.372
571
N/A
478
374
0.05150

1-15
2.87
1.90099
23.01
3.333

693
460
374
0.05439

1-16
2.90
1.90643
22.88
3.341

N/A
500
375
0.05823

1-17
2.89
1.87843
23.92
3.298
581
544
443
372
0.03883

1-18
2.90
1.87702
23.79
3.295
575
N/A
461
373
0.03802

1-19
2.94
1.88584
23.83
3.313
573
514
438
371
0.04324

1-20
2.90
1.88581
24.02
3.329
582
528
439
371
0.04001

1-21
3.96
1.88185
23.84
3.311

508
437
370
0.03965

1-22
2.94
1.87894
23.70
3.266
582
526
443
372
0.04574

1-23
2.93
1.87815
23.64
3.281

514
442
372
0.04195

1-24
3.97
1.87486
23.77
3.262

505
437
372
0.04246

1-25
3.00
1.87931
23.56
3.232

650
452
374
0.05291

1-26
2.81
1.93027
22.53
3.429
580
562
473
379
0.06447

1-27
2.77
1.92297
21.40
3.415
587
573
475
380
0.05997

1-28
2.73
1.92238
22.77
3.429
594
564
471
379
0.05658

1-29
2.86
1.90832
23.09
3.381
572
555
465
376
0.05212

1-30
5.74
1.90598
22.63
3.372
578
563
471
378
0.05158

1-31
3.84
1.92643
22.32
3.413
572
590
480
380
0.06383

1-32
3.84
1.91948

3.382

666
487
381
0.06308

1-33
2.78
1.90072
23.33
3.393
580
560
469
377
0.04212

1-34
2.76
1.90098
23.35
3.413
585
569
468
376
0.03838

1-35
2.77
1.90423
23.18
3.392
585
570
470
377
0.04583

1-36
2.77
1.90037
23.40
3.397
580
568
466
375
0.04097

1-37
5.65
1.88576
23.40
3.343
578
553
465
375
0.03716

1-38
7.20
1.87933
23.47
3.341

548
463
375
0.03113

1-39
8.71
1.87258
23.57
3.336

549
461
374
0.02538

1-40
10.21
1.86530

3.331

602
464
373
0.01910

1-41
2.73
1.89768
23.50
3.429

554
461
374
0.03188

1-42
2.68
1.89943
23.74
3.458

559
461
373
0.02783

1-43
4.08
1.89182
22.03
3.345

556
466
377
0.04282

1-44
2.48
1.89719
23.33
3.345

564
469
377
0.04819

1-45
2.80
1.89548
23.20
3.352

569
468
377
0.04508

1-46
2.81
1.89641
23.24
3.356

549
464
377
0.04521

1-47
2.77
1.90091
23.33
3.404
584
545
462
376
0.04011

1-48
2.70
1.90124
23.49
3.457
586
565
469
377
0.02984

1-49
2.64
1.90126
23.64
3.504
590
562
466
376
0.02046

1-50
2.77
1.89547
23.57
3.406
586
561
464
375
0.03427

1-51
2.78
1.89561
23.51
3.398
582
551
461
375
0.03601

1-52
2.77
1.90107
23.33
3.402
581
551
465
376
0.04067

1-53
3.50
1.89703
23.40
3.405
580
565
469
377
0.03603

TABLE 1-2(2)

Glass composition

(% by mass)
Glass properties

Na₂O + K₂O +

Specific
Tg
λ80
λ70
λ5
nd − (0.2*Specific

No.
Cs₂O
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
Weight + 1.18)

1-54
3.01
1.89909
23.40
3.406
581
566
468
376
0.03789

1-55
2.75
1.89968
23.36
3.408
582
569
466
376
0.03808

1-56
2.78
1.8991
23.43
3.380
584
626
474
376
0.04310

1-57
2.79
1.89915
23.42
3.375
586
579
468
376
0.04415

1-58
2.52
1.90093
23.39
3.407
583
570
470
376
0.03953

1-59
3.25
1.89667
23.45
3.400
582
557
465
376
0.03667

1-60
2.75
1.89848
23.46
3.404
586
553
466
377
0.03768

1-61
2.77
1.90705
23.43
3.417
578
561
472
378
0.04365

1-62
2.77
1.90226
23.30
3.418
586
556
466
377
0.03866

1-63
2.75
1.90216
23.37
3.425
589
551
464
376
0.03716

1-64
2.94
1.89924
23.48
3.452
587
566
470
377
0.02884

1-65
3.02
1.89899
23.53
3.399
583
565
469
377
0.03919

1-66
2.28
1.9636
23.38
3.858
621
648
499
387
0.01200

1-67
0.64
1.95856
22.26
3.830
639
656
499
387
0.01256

1-68
2.40
1.95316
22.30
3.668
621
668
500
387
0.03956

1-69
2.33
1.95215
21.79
3.720
618
N/A
524
385
0.02815

1-70
0.63
1.99951
21.92
3.890
636
N/A
518
394
0.04151

1-71
0.66
2.00242
21.02
3.817
628
N/A
526
395
0.05902

1-72
2.31
1.99474
20.78
3.787
616
N/A
520
393
0.05734

1-73
0.64
1.99624
21.02
3.865
629
N/A
517
396
0.04324

1-74
0.63
1.99462
21.17
3.907
637
N/A
516
395
0.03322

1-75
3.02
1.90223
23.36
3.405
585
566
472
378
0.04123

1-76
2.94
1.9023
23.44
3.459
589
564
469
377
0.03050

1-77
2.94
1.90575
23.55
3.467
590
560
468
377
0.03235

1-78
2.90
1.89824
23.79
3.498
589
549
462
376
0.01864

1-79
3.01
1.89573
23.72
3.414
584
559
468
376
0.03293

1-80
3.02
1.8959
23.61
3.399
586
569
472
377
0.03610

1-81
2.93
1.89591
23.90
3.468
590
561
466
376
0.02231

1-82
2.95
1.89598
23.79
3.452
588
555
465
376
0.02558

1-83
3.01
1.90158
23.38
3.419
586
561
470
377
0.03778

1-84
3.05
1.90054
23.36
3.382
586
561
468
377
0.04414

1-85
2.93
1.90183
23.54
3.473
588
553
465
377
0.02723

1-86
2.97
1.90052
23.54
3.436
587
551
464
376
0.03332

1-87
2.93
1.89651
23.73
3.446
591
559
467
376
0.02731

1-88
2.95
1.90232
23.46
3.456
581
564
471
377
0.03112

1-89
2.97
1.90443
23.38
3.460
579
564
470
377
0.03243

1-90
2.97
1.89848
23.60
3.433
586
554
468
377
0.03188

1-91
2.97
1.89833
23.60
3.43
590
559
469
377
0.03233

1-92
2.97
1.89847
23.69
3.437
590
548
466
376
0.03107

1-93
2.97
1.89856
23.63
3.432
582
552
464
376
0.03216

1-94
2.97
1.90048
23.64
3.438

571
475
377
0.03288

1-95
2.93
1.89251
23.60
3.42

565
469
377
0.02851

1-96
3.91
1.89666
23.51
3.438

558
467
377
0.02906

1-97
3.97
1.90344
23.43
3.452

563
467
376
0.03304

1-98
3.03
1.88811
23.77
3.379

575
466
375
0.03231

1-99
3.06
1.88831
23.71
3.365

569
464
375
0.03531

1-100
0.00
1.96914
22.11
3.89
657
639
500
388
0.01114

1-101
0.00
2.01059
21.43
4.05
661
N/A
538
393
0.02059

1-102
0.00
2.00864
21.62
4.05
670
N/A
511
391
0.01864

1-103
0.00
2.02551
20.90
4.06
677
N/A
549
399
0.03351

1-104
0.00
2.02450
21.08
4.09
678
N/A
540
397
0.02650

1-105
2.41
1.99093
21.75
4.01
688
N/A
514
391
0.00893

TABLE 1-2(3)

Glass composition

(% by mass)
Glass properties

Na₂O + K₂O +

Specific
Tg
λ80
λ70
λ5
nd − (0.2*Specific

No.
Cs₂O
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
Weight + 1.18)

1-106
3.99
1.89542
23.34
3.396
580
557
467
377
0.03622

1-107
4.94
1.8914
23.41
3.395
584
566
468
376
0.0324

1-108
4.48
1.89093
23.44
3.384
581
566
468
376
0.03413

1-109
2.98
1.89112
23.14
3.38
590
556
465
377
0.03512

1-110
3.05
1.89951
23.23
3.38
583
551
468
378
0.04351

1-111
3.03
1.89942
23.36
3.388
588
553
467
377
0.04182

1-112
5.23
1.8865
23.56
3.356
582
549
465
376
0.0353

1-113
3.09
1.88826
23.64
3.345
582
545
463
376
0.03926

1-114
3.06
1.88811
23.75
3.361

546
464
376
0.03591

1-115
3.55
1.89457
23.41
3.365

552
466
377
0.04157

1-116
4.04
1.88953
23.5
3.351

544
465
377
0.03933

1-117
3.01
1.89895
23.5
3.393

543
465
377
0.04035

1-118
3.03
1.90024
23.75
3.376
588
558
469
378
0.04504

1-119
3.28
1.90025
23.29
3.378
590
558
469
378
0.04465

1-120
3.22
1.90023
23.29
3.379

553
467
378
0.04443

1-121
3.16
1.89992
23.3
3.377

552
465
377
0.04452

1-122
3.07
1.89897
23.3
3.359
583
561
472
378
0.04717

1-123
3.06
1.90618
22.84
3.361
583
566
475
379
0.05398

1-124
3.05
1.90622
22.85
3.369
583
570
474
379
0.05242

1-125
3.03
1.90606
22.92
3.376
582
609
475
378
0.05086

1-126
3.09
1.89901
23.27
3.351
584
566
472
377
0.04881

1-127
3.03
1.90185
22.87
3.351
586
595
479
379
0.05165

1-128
2.29
1.90097
22.89
3.347
587
670
486
380
0.05157

1-129
3.07
1.90296
22.92
3.35
583
560
469
378
0.05296

1-130
2.97
1.88883
23.63
3.372
585
556
466
377
0.03443

1-131
2.9
1.8786
23.91
3.349
589
548
461
375
0.0288

1-132
2.8
1.85463
24.38
3.293
589
567
474
376
0.01603

1-133
3.02
1.8907
23.4
3.342
590
598
475
377
0.0423

1-134
4.55
1.89048
23.4
3.345
583
561
471
377
0.04148

1-135
3.58
1.89424
23.38
3.346
582
564
471
377
0.04504

1-136
5.04
1.88593
23.54
3.332
584
552
466
377
0.03953

1-137
3.01
1.88866
23.57
3.337
585
557
464
376
0.04126

1-138
3.11
1.89279
23.57
3.353
581
559
468
377
0.04219

1-139
3.14
1.89292
23.51
3.337
580
552
464
376
0.04552

1-140
3.02
1.89479
23.47
3.356
590
556
469
377
0.04359

1-141
3.06
1.89777
23.26
3.354
582
578
474
378
0.04697

1-142
3.07
1.8924
23.68
3.361
585
550
466
377
0.0402

1-143
3.07
1.89572
23.57
3.36
587
551
466
377
0.04372

1-144
3.08
1.89843
23.24
3.354
581
546
454
372
0.04763

1-145
3.13
1.88954
23.77
3.348
580
N/A
N/A
377
0.03994

TABLE 1-2(4)

Glass composition

(% by mass)
Glass properties

Na₂O + K₂O +

Specific
Tg
λ80
λ70
λ5
nd − (0.2*Specific

No.
Cs₂O
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
Weight + 1.18)

1-146
3.14
1.88958
23.73
3.343
582
N/A
668
376
0.04098

1-147
3.15
1.88967
23.64
3.335
581
N/A
580
375
0.04267

1-148
3.17
1.8876
23.54
3.326
582
N/A
546
374
0.0424

1-149
3.06
1.89782
23.38
3.353
580
665
533
377
0.04722

1-150
3.55
1.8959
23.39
3.353
583
N/A
556
377
0.0453

1-151
3.8
1.89363
23.44
3.349
583
N/A
599
379
0.04383

1-152
3.05
1.89767
23.49
3.364
584
N/A
628
379
0.04487

1-153
2.99
1.89935
23.42
3.411
581
583
500
381
0.03715

1-154
2.97
1.89904
23.53
3.43
584
578
490
378
0.03304

1-155
3.01
1.89932
23.41
3.406
588
593
497
380
0.03812

1-156
2.98
1.89937
23.62
3.426
587
580
500
381
0.03417

1-157
2.99
1.90099
23.35
3.423
578
565
489
379
0.03639

1-158
2.97
1.90325
23.32
3.426
588
591
500
381
0.03805

1-159
3.02
1.90299
23.41
3.412
582
576
488
378
0.04059

1-160
3.01
1.90284
23.41
3.437
583
570
490
379
0.03544

1-161
3.01
1.90019
23.49
3.413
588
576
496
380
0.03759

1-162
2.99
1.9003
23.51
3.433
586

0.0337

1-163
3.03
1.90041
23.31
3.4
582
592
484
378
0.04041

1-164
3.02
1.90055
23.31
3.4

591
483
378
0.04055

1-165
3.02
1.9005
23.29
3.401
583
576
474
377
0.0403

1-166
3.02
1.90049
23.29
3.4

572
473
377
0.04049

1-167
3.02
1.89837
23.37
3.389
573
567
479
379
0.04057

1-168
3.03
1.90132
23.29
3.4
582
569
483
379
0.04132

1-169
3.02
1.89832
23.38
3.397
583
567
477
378
0.03892

1-170
3.02
1.90151
23.25
3.402
583
558
473
378
0.04111

1-171
0.65
2.01328
20.96
3.919
604
N/A
522
398
0.04948

1-172
2.29
2.00332
20.96
3.88
612
N/A
525
397
0.04732

1-173
2.32
2.00373
20.82
3.854
618
N/A
522
400
0.05293

1-174
2.27
2.00319
21.01
3.89
619
N/A
517
396
0.04519

1-175
2.3
2.00338
20.89
3.871
619
681
511
396
0.04918

1-176
1.48
2.00866
20.89
3.888
605
N/A
527
399
0.05106

1-177
0.66
2.01517
20.82
3.894
609
N/A
527
400
0.05637

1-178
0
2.01957
20.77
3.903
621
N/A
529
400
0.05897

1-179
2.93
1.89886
23.64
3.456
584
609
502
380
0.02766

1-180
2.9
1.89904
23.74
3.464
594
587
488
378
0.02624

1-181
2.86
1.89897
23.78
3.505
593
573
484
378
0.01797

1-182
2.89
1.89946
23.69
3.496
590
562
478
378
0.02026

1-183
2.79
1.89862
24.01
3.542
598
564
481
378
0.01022

1-184
2.81
1.89917
23.93
3.534
589
567
482
379
0.01237

1-185
2.82
1.89987
23.81
3.529
589
559
479
378
0.01407

Example 1-2

The optical glasses (Nos. 1-1 to 1-105) prepared in Example 1-1 were compared with the optical glasses disclosed in Examples of Patent Documents 1 to 4. In a graph in which the refractive index nd is a vertical axis, and the specific weight is a horizontal axis, the optical glasses of Example 1-1 and the optical glasses disclosed in Examples of Patent Documents 1 to 4 were plotted. Results are illustrated in FIG. 1.

As illustrated in FIG. 1, the optical glass of Example 1-1 and the optical glasses disclosed in Examples of Patent Documents 1 to 4 are distinguished by a straight line of nd=0.2×Specific Weight+1.18.

That is, it was found that the optical glass of the present invention was distinctively distinguished from the optical glasses disclosed in Examples of Patent Documents 1 to 4 by the straight line of nd=0.2×Specific Weight+1.18, and had a remarkable effect that a ratio was low with respect to the same refractive index nd.

Example 1-3

A lens blank was prepared by using each of the optical glasses prepared in Example 1-1 in accordance with a known method, and various lenses were prepared by processing the lens blank in accordance with a known method such as polishing.

The prepared optical lens was various lenses such as a planar lens, a biconvex lens, a biconcave lens, a plano-convex lens, a plano-concave lens, a concave meniscus lens, and a convex meniscus lens.

A secondary chromatic aberration was capable of being excellently corrected by combining various lenses with a lens including another type of optical glass.

In addition, the glass had a low specific weight, and thus, each of the lenses had a small weight compared to a lens having the same optical properties and size, and was suitable for goggle type or spectacle type AR display device or MR display device. Similarly, a prism was prepared by using various optical glasses prepared in Example 1-1.

Example 1-4

Each of the optical glasses prepared in Example 1-1 was processed into the shape of a rectangular thin plate having Length of 50 mm×Width of 20 mm×Thickness of 1.0 mm to obtain a light guide plate. The light guide plate was built in the head mounted display 1 illustrated in FIG. 2.

In the head mounted display obtained as described above, an image was evaluated in an eye-point position, and a high-brightness and high-contrast image was capable of being observed at a wide viewing angle.

Example 2
Example 2-1

Glass samples having glass compositions shown in Tables 2-1(1), 2-1(2), 2-1(3), 2-1(4), 2-2(1), 2-2(2), 2-2(3), and 2-2(4) were prepared by the following procedure, and various evaluations were performed.

[Manufacturing of Optical Glass]

First, an oxide, a hydroxide, a carbonate, and a nitrate corresponding to structural components of the glass were prepared as a raw material, the raw materials were weighed and blended such that a glass composition of optical glass to be obtained was each of the compositions shown in Tables 2-1(1), 2-1(2), 2-1(3), 2-1(4), 2-2(1), 2-2(2), 2-2(3), and 2-2(4), and the raw materials were sufficiently mixed. A blended raw material (a batch raw material) obtained as described above was put in a platinum crucible, and was heated at 1350° C. to 1400° C. for 2 hours to be molten glass, and the molten glass was stirred, homogenized, and clarified, and then, was cast into a mold that was preheated to a suitable temperature. The cast glass was subjected to a heat treatment at approximately a glass transition temperature Tg for 30 minutes, and was allowed to cool in a furnace to a room temperature, and thus, a glass sample was obtained.

[Check of Glass Component Composition]

[Measurement of Optical Properties]

The obtained glass sample was further subjected to an annealing treatment at approximately the glass transition temperature Tg for approximately 30 minutes to 2 hours, and then, was cooled in the furnace to the room temperature at a temperature decrease rate of −30° C./hour, and thus, an annealed sample was obtained. In the obtained annealed sample, refractive indices nd, ng, nF, and nC, an Abbe's number νd, a specific weight, the glass transition temperature Tg, λ80, λ70, and λ5 were measured. Results are shown in Tables 2-3(1), 2-3(2), 2-3(3), and 2-3(4).

(i) Refractive Indices nd, ng, nF, and nC and Abbe's Number νd

νd=(nd−1)/(nF−nC)

(ii) Specific Weight

The specific weight was measured by an Archimedes method.

(iii) Glass Transition Temperature Tg

(iv) λ80, λ70, and λ5

In the annealed sample having a thickness of 10.0 mm±0.1 mm, a spectral transmittance was measured in a range of a wavelength of 200 to 700 nm. A wavelength at which an external transmittance was 80% was λ80, a wavelength at which an external transmittance was 70% was 270, and a wavelength at which an external transmittance was 5% was λ5.

TABLE 2-1(1)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

2-1
0.00
21.48
1.02
0.00
3.09
2.49
0.00
0.00
9.41
0.00
10.78
26.46

2-2
0.00
21.29
1.01
0.00
2.21
4.23
0.00
0.00
9.33
0.00
10.68
26.21

2-3
0.00
21.17
1.00
0.00
2.20
2.45
0.00
2.28
9.28
0.00
10.63
26.09

2-4
0.00
20.99
0.99
0.00
2.18
2.43
0.00
0.00
12.34
0.00
10.53
25.85

2-5
0.00
24.22
1.15
0.00
4.94
2.81
0.00
0.00
10.61
0.00
2.24
29.83

2-6
0.00
23.74
1.12
0.00
4.61
2.75
0.00
0.00
10.40
0.00
2.19
29.25

2-7
0.00
23.59
1.12
0.00
4.34
2.73
0.00
0.00
11.23
0.00
2.18
29.04

2-8
0.00
26.33
1.15
0.00
4.95
2.82
0.00
0.00
10.68
0.00
0.00
27.44

2-9
0.00
24.58
2.31
0.00
4.99
2.85
0.00
0.00
10.77
0.00
0.00
27.64

2-10
0.00
26.80
1.17
0.00
5.04
2.87
0.00
0.00
10.87
0.00
0.00
30.55

2-11
0.00
25.02
2.35
0.00
5.08
2.90
0.00
0.00
10.96
0.00
0.00
30.80

2-12
0.00
28.98
1.18
0.00
5.07
2.89
0.00
0.00
10.94
0.00
0.00
28.09

2-13
0.00
27.06
1.18
1.71
5.08
2.90
0.00
0.00
10.97
0.00
0.00
28.18

2-14
0.00
27.39
1.20
0.00
5.65
2.94
0.00
0.00
11.11
0.00
0.00
28.51

2-15
0.00
27.01
1.18
0.00
5.08
2.90
0.00
0.00
12.83
0.00
0.00
28.12

2-16
0.00
27.24
1.19
0.00
5.12
3.96
0.00
0.00
11.05
0.00
0.00
28.37

2-17
0.00
29.50
1.20
0.00
5.16
2.94
0.00
0.00
11.14
0.00
0.00
31.31

2-18
0.00
29.38
1.20
0.00
5.64
2.93
0.00
0.00
9.20
0.00
0.00
28.48

2-19
0.00
29.34
1.20
0.00
4.63
3.97
0.00
0.00
11.08
0.00
0.00
31.13

2-20
0.00
30.04
1.22
0.00
5.26
3.00
0.00
0.00
11.34
0.00
0.00
34.64

2-21
0.00
22.31
1.15
0.00
4.92
2.81
0.00
0.00
12.44
0.00
0.00
29.87

2-22
0.00
23.90
1.13
0.00
4.38
2.77
0.00
0.00
12.26
0.00
0.00
29.44

2-23
0.00
23.59
1.12
0.00
3.85
2.73
0.00
0.00
13.87
0.00
0.00
29.06

2-24
0.00
24.74
1.17
0.00
5.52
2.86
0.00
0.00
10.84
0.00
0.00
27.84

2-25
0.00
23.73
1.12
0.00
3.87
2.75
2.99
0.00
10.40
0.00
0.00
29.22

2-26
0.00
22.49
1.16
0.00
4.96
3.84
0.00
0.00
10.71
0.00
0.00
30.13

2-27
0.00
25.96
1.14
0.00
4.64
2.78
0.00
0.00
10.53
1.66
0.00
27.03

2-28
0.00
25.75
1.13
0.00
4.60
2.76
0.00
0.00
10.45
0.00
2.44
26.82

2-29
0.00
25.88
1.13
0.00
4.62
2.77
0.00
0.00
10.50
0.00
0.00
26.96

2-30
0.00
25.89
1.13
0.00
4.86
2.77
0.00
0.00
10.50
0.00
0.00
24.40

2-31
0.00
25.84
1.13
0.00
3.87
3.21
2.44
0.00
10.48
0.00
0.00
26.90

2-32
0.00
25.62
1.12
0.00
3.07
4.78
2.42
0.00
10.39
0.00
0.00
26.69

2-33
0.00
25.41
1.11
0.00
2.28
6.31
2.40
0.00
10.31
0.00
0.00
26.48

2-34
0.00
25.46
1.11
0.00
4.78
2.73
0.00
0.00
10.32
0.00
0.00
21.48

2-35
0.00
25.04
1.10
0.00
4.71
2.68
0.00
0.00
10.15
0.00
0.00
18.66

2-36
0.00
26.05
1.14
0.00
4.68
1.62
2.46
0.00
10.57
0.00
0.00
27.13

2-37
0.00
26.27
1.15
0.00
5.51
0.00
2.48
0.00
10.66
0.00
0.00
27.36

2-38
1.15
26.10
1.14
0.00
4.66
2.80
0.00
0.00
10.58
0.00
0.00
27.18

2-39
0.00
26.18
1.15
0.83
4.68
2.81
0.00
0.00
10.62
0.00
0.00
27.26

2-40
0.00
25.86
1.13
0.00
4.62
2.77
0.00
0.00
10.49
0.83
1.23
26.92

2-41
0.00
25.20
1.10
0.00
4.27
2.70
0.00
0.00
10.22
0.00
4.78
26.24

2-42
0.00
24.67
1.08
0.00
3.95
2.64
0.00
0.00
10.00
0.00
7.01
25.70

2-43
0.00
26.26
1.13
0.00
4.61
2.77
0.00
0.00
10.46
0.00
2.45
26.23

2-44
0.00
26.39
1.13
0.00
4.63
2.78
0.00
0.00
10.51
0.00
2.46
26.97

2-45
0.00
25.87
1.13
0.00
4.67
2.77
0.00
0.00
10.49
0.00
1.96
26.95

2-46
0.00
25.62
1.12
0.00
4.34
2.75
0.75
0.00
10.39
0.00
2.43
26.69

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

2-1
23.47
1.80
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-2
23.26
1.78
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-3
23.13
1.77
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-4
22.93
1.76
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-5
22.17
2.03
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-6
25.94
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-7
25.77
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-8
26.63
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-9
26.86
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-10
22.70
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-11
22.89
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-12
22.85
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-13
22.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-14
23.20
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-15
22.88
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-16
23.07
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-17
18.75
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-18
23.17
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-19
18.65
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-20
14.50
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-21
26.50
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-22
26.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-23
25.78
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-24
27.03
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-25
25.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-26
26.71
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-27
26.26
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-28
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-29
26.17
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-30
30.45
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-31
26.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-32
25.91
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-33
25.70
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-34
34.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-35
37.66
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-36
26.35
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-37
26.57
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-38
26.39
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-39
26.47
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-40
26.15
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-41
25.49
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-42
24.95
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-43
26.09
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-44
25.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-45
26.16
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-46
25.91
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

TABLE 2-1(2)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

2-47
0.00
25.69
1.12
0.00
4.59
2.26
0.75
0.00
10.42
0.00
2.43
26.76

2-48
0.28
25.68
1.12
0.00
4.59
2.75
0.00
0.00
10.42
0.00
2.43
26.76

2-49
0.00
26.41
1.13
0.00
4.63
2.78
0.00
0.00
10.51
0.00
0.00
26.36

2-50
0.00
26.51
1.14
0.00
4.65
2.79
0.00
0.00
10.56
0.00
0.00
27.11

2-51
0.00
25.75
1.13
0.00
4.84
1.77
0.75
0.00
10.45
0.00
2.44
26.82

2-52
0.00
25.62
1.12
0.00
4.58
1.76
1.49
0.00
10.39
0.00
2.43
26.69

2-53
0.00
26.61
0.57
0.00
4.58
2.75
0.00
0.00
10.40
0.00
2.43
26.72

2-54
0.00
24.90
1.69
0.00
4.62
2.77
0.00
0.00
10.49
0.00
2.45
26.93

2-55
0.00
25.84
0.58
0.00
4.86
2.77
0.00
0.00
10.48
0.00
2.45
26.90

2-56
0.00
25.67
0.57
0.00
4.59
2.75
0.00
0.00
11.30
0.00
2.43
26.73

2-57
0.00
25.14
1.10
0.00
4.26
2.21
0.73
0.00
10.19
0.00
4.77
26.18

2-58
0.00
25.80
1.13
0.00
4.61
2.27
0.75
0.00
10.46
0.00
2.45
27.50

2-59
0.00
20.71
0.98
0.00
2.15
2.40
0.00
0.00
9.07
0.00
10.39
29.94

2-60
0.00
20.12
0.95
0.00
2.09
2.33
0.00
0.00
8.82
0.00
10.10
24.78

2-61
0.00
16.71
0.94
0.00
2.47
0.66
0.00
0.00
8.72
0.00
14.07
33.01

2-62
0.00
16.71
0.94
0.00
2.07
2.31
0.00
0.00
8.72
0.00
9.99
28.77

2-63
0.00
25.76
1.13
0.00
4.60
2.27
0.75
0.00
10.45
0.00
0.00
27.46

2-64
0.00
25.10
1.10
0.00
4.25
2.21
0.73
0.00
10.18
0.00
2.38
26.14

2-65
0.00
25.06
1.10
0.00
4.25
2.21
0.73
0.00
10.16
0.00
0.00
26.09

2-66
0.00
24.80
1.09
0.00
4.20
2.18
0.72
0.00
10.06
0.00
4.70
25.82

2-67
0.00
25.62
1.12
0.00
4.58
2.26
0.75
0.00
10.39
0.00
2.43
26.04

2-68
0.00
25.84
1.13
0.00
4.62
2.27
0.75
0.00
10.48
0.00
2.45
27.54

2-69
0.00
24.97
1.09
0.00
4.23
2.20
0.73
0.00
10.13
0.00
4.73
24.77

2-70
0.00
25.17
1.10
0.00
4.27
2.22
0.73
0.00
10.21
0.00
4.77
26.22

2-71
0.00
25.68
1.12
0.00
4.59
2.26
0.75
0.00
10.42
0.00
0.00
27.38

2-72
0.00
25.96
1.14
0.00
4.64
2.29
0.76
0.00
10.53
0.00
0.00
27.68

2-73
0.00
25.03
1.10
0.00
4.24
2.20
0.73
0.00
10.15
0.00
2.37
26.07

2-74
0.00
25.30
1.11
0.00
4.29
2.23
0.74
0.00
10.26
0.00
2.40
26.33

2-75
0.00
25.97
0.56
0.00
4.24
2.20
0.73
0.00
10.15
0.00
4.75
26.08

2-76
0.00
24.30
1.65
0.00
4.28
2.22
0.73
0.00
10.23
0.00
4.78
26.29

2-77
0.00
23.45
2.20
0.00
4.29
2.23
0.74
0.00
10.28
0.00
4.80
26.39

2-78
0.00
25.50
1.11
0.00
4.29
2.23
0.74
0.00
10.27
0.00
2.40
26.10

2-79
0.00
25.54
1.11
0.00
4.30
2.23
0.74
0.00
10.28
0.00
2.40
26.41

2-80
0.00
25.32
1.11
0.00
4.29
2.23
0.74
0.00
10.53
0.00
2.40
26.00

2-81
0.00
25.39
1.11
0.00
4.30
2.23
0.74
0.00
10.56
0.00
2.41
26.44

2-82
0.00
25.32
1.11
0.00
4.36
2.23
0.74
0.00
10.27
0.00
3.12
26.54

2-83
0.00
26.81
1.09
0.00
3.84
2.20
0.73
0.00
10.12
0.00
3.08
26.18

2-84
0.00
25.19
1.10
0.00
3.87
3.18
0.73
0.00
10.22
0.00
3.10
26.43

2-85
0.00
23.65
1.12
0.00
4.40
3.23
0.74
0.00
10.36
0.00
3.15
26.80

2-86
0.00
26.85
1.13
0.00
4.62
2.28
0.75
0.00
10.50
0.00
2.45
26.31

2-87
0.00
27.07
1.14
0.00
4.66
2.30
0.76
0.00
10.59
0.00
2.47
27.83

2-88
0.00
15.03
0.85
0.00
1.55
0.00
0.00
0.00
6.50
2.21
16.32
27.41

2-89
0.00
14.89
0.84
0.00
1.18
0.00
0.00
0.00
7.77
2.18
16.16
27.14

2-90
0.00
14.55
0.82
0.00
0.63
0.00
0.00
0.00
7.59
2.14
15.80
29.29

2-91
0.00
14.29
0.81
0.00
0.62
0.00
0.00
0.00
7.46
2.10
15.51
26.04

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

2-47
25.98
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-48
25.97
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-49
26.21
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-50
25.26
1.98
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-51
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-52
25.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-53
25.94
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-54
26.15
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-55
26.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-56
25.96
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-57
25.42
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-58
25.03
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-59
22.63
1.73
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-60
29.13
1.68
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-61
21.75
1.67
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-62
28.82
1.67
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-63
24.99
0.00
0.00
0.00
0.00
2.59
0.00
100.00
0.03

2-64
25.38
0.00
0.00
0.00
0.00
2.53
0.00
100.00
0.03

2-65
25.35
0.00
0.00
0.00
0.00
5.05
0.00
100.00
0.03

2-66
23.04
0.00
0.00
3.39
0.00
0.00
0.00
100.00
0.03

2-67
24.86
1.95
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-68
22.95
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-69
25.25
1.90
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-70
23.39
1.92
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-71
24.92
0.00
0.00
0.00
2.88
0.00
0.00
100.00
0.03

2-72
25.19
0.00
0.00
0.00
0.00
0.00
1.81
100.00
0.03

2-73
25.31
0.00
0.00
0.00
2.80
0.00
0.00
100.00
0.03

2-74
25.57
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

2-75
25.32
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-76
25.52
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-77
25.62
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-78
25.59
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

2-79
25.22
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

2-80
25.61
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

2-81
25.05
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

2-82
25.29
0.00
0.00
0.00
0.00
1.02
0.00
100.00
0.03

2-83
24.94
0.00
0.00
0.00
0.00
1.01
0.00
100.00
0.03

2-84
25.17
0.00
0.00
0.00
0.00
1.01
0.00
100.00
0.03

2-85
25.52
0.00
0.00
0.00
0.00
1.03
0.00
100.00
0.03

2-86
25.11
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-87
23.18
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-88
22.74
7.39
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-89
22.52
7.32
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-90
22.02
7.16
0.00
0.00
0.00
0.00
0.00
100.00
0.03

2-91
26.14
7.03
0.00
0.00
0.00
0.00
0.00
100.00
0.03

TABLE 2-1(3)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

2-92
0
25.67
1.12
0
4.11
3.24
0.75
0
10.41
0
2.43
27.37

2-93
0
25.54
1.12
0
3.62
4.2
0.74
0
10.36
0
2.42
27.22

2-91
0
25.54
1.12
0
4.09
2.25
2.23
0
10.36
0
2.42
27.21

2-95
0
27.32
1.11
0
4.07
2.24
0.74
0
10.31
0
2.41
27.12

2-96
0
26.02
1.14
0
4.65
2.29
0.76
0
10.55
0
2.47
29.01

2-97
0
25.85
1.13
0
4.38
2.28
0.75
0
11.38
0
2.45
28.83

2-98
0
25.6
1.12
0
3.87
2.25
2.98
0
10.83
0
1.21
27.3

2-99
0
27.28
1.15
0
4.7
2.32
0.77
0
11.13
0
1.25
28.04

2-100
0
27.04
1.14
0
4.66
2.3
0.76
0
11.03
0
1.24
26.52

2-101
0
25.86
1.13
0
4.62
1.29
2.26
0
10.94
0
1.23
27.57

2-102
0
25.73
1.13
0
4.6
0.29
3.75
0
10.88
0
1.22
27.43

2-103
0
25.66
1.12
0
4.11
2.26
0.75
0
12.63
0
1.22
27.35

2-104
0
26.1
1.13
0
4.32
2.28
0.75
0
11.39
0
1.23
28.84

2-105
0
25.88
1.13
0
4.27
2.53
0.75
0
11.39
0
1.23
28.85

2-106
0
25.88
1.13
0
4.32
2.28
0.94
0
11.39
0
1.23
28.86

2-107
0
25.88
1.13
0
4.38
2.03
1.13
0
11.39
0
1.23
28.86

2-108
0
26.2
1.15
0
4.68
2.31
0.76
0
11.54
0
0
27.93

2-109
0
26.1
1.14
0
4.66
2.3
0.76
0
10.59
0
0
29.12

2-110
0
25.99
1.14
0
4.64
2.29
0.76
0
10.54
0
0
28.35

2-111
0
25.88
1.13
0
4.62
2.28
0.75
0
10.5
0
0
27.6

2-112
0
26.32
1.15
0
4.7
2.32
0.77
0
11.59
0
0
28.7

2-113
0
26.88
1.13
0
4.39
2.28
0.75
0
10.51
0
0
28.92

2-114
0
27.37
1.13
0
4.63
1.54
0.75
0
10.51
0
0
28.92

2-115
0
26.49
1.15
0
4.68
2.31
0.76
0
10.62
0
0
29.22

2-116
0
27.24
1.11
0
4.52
2.23
0.74
0
10.26
0
2.4
26.96

2-117
0
28.66
1.09
0
4.43
2.18
0.72
0
10.06
0
2.35
26.44

2-118
0
27.75
1.13
0
4.14
2.27
0.75
0
11.37
0
0
27.53

2-119
0
25.93
1.14
0
4.15
2.28
2.27
0
11.42
0
0
27.65

2-120
0
26.07
1.14
0
4.66
1.3
2.28
0
11.48
0
0
27.78

2-121
0
25.8
1.13
0
4.13
1.28
3.76
0
11.36
0
0
27.51

2-122
0
27.61
1.13
0
4.59
2.26
0.75
0
11.32
0
0
27.4

2-123
0
26.55
1.16
0
4.74
2.34
0.77
0
11.69
0
0
26.99

2-124
0
26.78
1.17
0
4.79
2.36
0.78
0
11.79
0
0
28.55

2-125
0
26.81
1.13
0
4.14
2.27
0.75
0
12.27
0
0
27.56

2-126
0
26.12
1.71
0
4.43
2.3
0.76
0
11.5
0
0
27.84

2-127
0
26.2
1.71
0
4.44
2.31
0.76
0
11.54
0
0
27.94

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

2-92
24.9
0
0
0
0
0
0
100
0.03

2-93
24.78
0
0
0
0
0
0
100
0.03

2-91
24.78
0
0
0
0
0
0
100
0.03

2-95
24.68
0
0
0
0
0
0
100
0.03

2-96
23.11
0
0
0
0
0
0
100
0.03

2-97
22.95
0
0
0
0
0
0
100
0.03

2-98
24.84
0
0
0
0
0
0
100
0.03

2-99
23.36
0
0
0
0
0
0
100
0.03

2-100
25.31
0
0
0
0
0
0
100
0.03

2-101
25.1
0
0
0
0
0
0
100
0.03

2-102
24.97
0
0
0
0
0
0
100
0.03

2-103
24.9
0
0
0
0
0
0
100
0.03

2-104
22.97
0.99
0
0
0
0
0
100
0.03

2-105
22.98
0.99
0
0
0
0
0
100
0.03

2-106
22.98
0.99
0
0
0
0
0
100
0.03

2-107
22.98
0.99
0
0
0
0
0
100
0.03

2-108
25.43
0
0
0
0
0
0
100
0.03

2-109
25.33
0
0
0
0
0
0
100
0.03

2-110
26.29
0
0
0
0
0
0
100
0.03

2-111
27.24
0
0
0
0
0
0
100
0.03

2-112
24.45
0
0
0
0
0
0
100
0.03

2-113
25.14
0
0
0
0
0
0
100
0.03

2-114
25.15
0
0
0
0
0
0
100
0.03

2-115
24.77
0
0
0
0
0
0
100
0.03

2-116
24.54
0
0
0
0
0
0
100
0.03

2-117
24.07
0
0
0
0
0
0
100
0.03

2-118
25.06
0
0
0
0
0
0
100
0.03

2-119
25.16
0
0
0
0
0
0
100
0.03

2-120
25.29
0
0
0
0
0
0
100
0.03

2-121
25.03
0
0
0
0
0
0
100
0.03

2-122
24.94
0
0
0
0
0
0
100
0.03

2-123
25.76
0
0
0
0
0
0
100
0.03

2-124
23.78
0
0
0
0
0
0
100
0.03

2-125
25.07
0
0
0
0
0
0
100
0.03

2-126
25.34
0
0
0
0
0
0
100
0.03

2-127
23.27
0
0
0
0
0
1.83
100
0.03

TABLE 2-1(4)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO
TiO₂

2-128
0
26.24
1.15
0
4.69
2.31
0.76
0
11.55
0
0
27.99

2-129
0
25.99
1.6
0
4.7
2.31
0.77
0
11.11
0
0
28.02

2-130
0
26.72
1.17
0
4.78
2.35
0.78
0
11.76
0
0
26.51

2-131
0
26.84
1.18
0
4.8
2.36
0.78
0
11.82
0
0
27.28

2-132
0
26.96
1.18
0
4.82
2.37
0.78
0
11.87
0
0
28.08

2-133
0
27.08
1.19
0
4.84
2.38
0.79
0
11.92
0
0
28.86

2-134
0
26.14
1.14
0
4.91
2.3
0.76
0
11.51
0
0
27.88

2-135
0
26.07
1.14
0
4.66
2.79
0.76
0
11.48
0
0
27.8

2-136
0
26.01
1.14
0
4.65
2.29
1.51
0
11.45
0
0
27.72

2-137
0
25.97
1.14
0
4.64
2.29
0.76
0
12.33
0
0
27.67

2-138
0
25.58
1.12
0
4.57
2.25
0.74
0
10.37
0
2.42
26.02

2-139
0
25.37
1.11
0
4.53
2.23
0.74
0
10.29
0
2.4
24.54

2-140
0
25.63
1.12
0
4.34
2.26
0.75
0
11.28
0
2.43
27.32

2-141
0
25.44
1.11
0
4.31
2.24
0.74
0
10.32
1.63
2.41
27.12

2-142
0
25.53
1.12
0
4.33
2.25
0.74
0
10.35
0
2.42
27.21

2-143
0
25.36
1.11
0
4.3
2.23
0.74
0
10.29
0
2.4
27.03

2-144
0
24.85
1.13
0
4.61
2.27
0.75
0
11.36
0
2.45
27.53

2-145
0
24.67
1.12
0
4.58
2.26
0.75
0
10.39
1.64
2.43
27.3

2-146
0
25.71
0.57
0
4.59
2.26
0.75
0
11.32
0
2.44
27.41

2-147
0
25.52
0.57
0
4.56
2.25
0.74
0
10.35
1.63
2.42
27.2

2-148
0
25.65
1.13
0
4.62
2.28
0.75
0
10.48
0
2.45
27.56

2-149
0
25.72
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44
27.68

2-150
0
25.69
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44
27.63

2-151
0
25.76
1.13
0
4.57
2.27
0.75
0
10.45
0
2.44
27.64

2-152
0
25.94
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44
27.45

2-153
0
25.51
1.13
0
4.63
2.28
0.75
0
10.5
0
2.45
27.62

2-154
0
25.9
1.13
0
4.61
2.27
0.75
0
10.47
0
2.45
27.38

2-155
0
25.59
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44
27.74

2-156
0
24.94
1.09
0
3.77
2.2
0.73
1.24
10.11
0
4.73
25.97

2-157
0
24.82
1.09
0
3.75
2.18
0.72
0
11.79
0
4.71
25.84

2-158
0
24.46
1.07
0
3.69
2.15
0.71
0
9.92
3.13
4.64
25.49

2-159
0
24.61
1.08
0
3.94
2.17
0.72
0
9.98
0
7
25.62

2-160
0
23.82
1.04
0
3.16
2.1
0.69
0
9.66
6.1
4.52
24.82

2-161
0
23.96
1.05
0
3.4
2.11
0.7
0
9.72
3.07
6.81
24.95

2-162
0
24.1
1.06
0
3.64
2.12
0.7
0
9.77
0
9.14
25.1

2-163
0
24.79
1.09
0
4.2
2.18
0.72
0
10.05
0
4.7
25.82

Glass composition (% by mass)

No.
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

2-128
23.31
2
0
0
0
0
0
100
0.03

2-129
25.5
0
0
0
0
0
0
100
0

2-130
25.93
0
0
0
0
0
0
100
0

2-131
24.94
0
0
0
0
0
0
100
0

2-132
23.94
0
0
0
0
0
0
100
0

2-133
22.94
0
0
0
0
0
0
100
0

2-134
25.36
0
0
0
0
0
0
100
0

2-135
25.3
0
0
0
0
0
0
100
0

2-136
25.23
0
0
0
0
0
0
100
0

2-137
25.2
0
0
0
0
0
0
100
0

2-138
26.93
0
0
0
0
0
0
100
0.03

2-139
28.79
0
0
0
0
0
0
100
0.03

2-140
24.87
0
0
0
0
0
0
100
0.03

2-141
24.68
0
0
0
0
0
0
100
0.03

2-142
24.77
0
1.28
0
0
0
0
100
0.03

2-143
24.61
1.93
0
0
0
0
0
100
0.03

2-144
25.05
0
0
0
0
0
0
100
0.03

2-145
24.86
0
0
0
0
0
0
100
0.03

2-146
24.95
0
0
0
0
0
0
100
0.03

2-147
24.76
0
0
0
0
0
0
100
0.03

2-148
25.08
0
0
0
0
0
0
100
0.03

2-149
24.97
0
0
0
0
0
0
100
0.03

2-150
25.02
0
0
0
0
0
0
100
0.03

2-151
24.99
0
0
0
0
0
0
100
0.03

2-152
24.98
0
0
0
0
0
0
100
0.03

2-153
25.13
0
0
0
0
0
0
100
0.03

2-154
25.04
0
0
0
0
0
0
100
0.03

2-155
25.01
0
0
0
0
0
0
100
0.03

2-156
25.22
0
0
0
0
0
0
100
0.03

2-157
25.1
0
0
0
0
0
0
100
0.03

2-158
24.74
0
0
0
0
0
0
100
0.03

2-159
24.88
0
0
0
0
0
0
100
0.03

2-160
24.09
0
0
0
0
0
0
100
0.03

2-161
24.23
0
0
0
0
0
0
100
0.03

2-162
24.37
0
0
0
0
0
0
100
0.03

2-163
18.96
0
0
0
0
7.49
0
100
0.03

TABLE 2-2(1)

Glass composition (% by mass)

Li₂O/

Li₂O + Na₂O +
Gd₂O₃+

TiO₂/
(Li₂O + Na₂O +

No.
K₂O + Cs₂O
La₂O₃+ Y₂O₃
TiO₂+ Nb₂O₅
(TiO₂+ Nb₂O₅)
K₂O + Cs₂O)

2-1
5.58
0.00
49.93
0.53
0.55

2-2
6.44
0.00
49.47
0.53
0.34

2-3
4.65
0.00
49.22
0.53
0.47

2-4
4.61
0.00
48.78
0.53
0.47

2-5
7.75
0.00
52.00
0.57
0.64

2-6
7.36
0.00
55.19
0.53
0.63

2-7
7.07
0.00
54.81
0.53
0.61

2-8
7.77
0.00
54.07
0.51
0.64

2-9
7.84
0.00
54.50
0.51
0.64

2-10
7.91
0.00
53.25
0.57
0.64

2-11
7.98
0.00
53.69
0.57
0.64

2-12
7.96
0.00
50.94
0.55
0.64

2-13
7.98
0.00
51.10
0.55
0.64

2-14
8.59
0.00
51.71
0.55
0.66

2-15
7.98
0.00
51.00
0.55
0.64

2-16
9.08
0.00
51.44
0.55
0.56

2-17
8.10
0.00
50.06
0.63
0.64

2-18
8.57
0.00
51.65
0.55
0.66

2-19
8.60
0.00
49.78
0.63
0.54

2-20
8.26
0.00
49.14
0.70
0.64

2-21
7.73
0.00
56.37
0.53
0.64

2-22
7.15
0.00
55.56
0.53
0.61

2-23
6.58
0.00
54.84
0.53
0.59

2-24
8.38
0.00
54.87
0.51
0.66

2-25
9.61
0.00
55.14
0.53
0.40

2-26
8.80
0.00
56.84
0.53
0.56

2-27
7.42
0.00
53.29
0.51
0.63

2-28
7.36
0.00
52.87
0.51
0.63

2-29
7.39
0.00
53.13
0.51
0.63

2-30
7.63
0.00
54.85
0.44
0.64

2-31
9.52
0.00
53.03
0.51
0.41

2-32
10.27
0.00
52.60
0.51
0.30

2-33
10.99
0.00
52.18
0.51
0.21

2-34
7.51
0.00
55.60
0.39
0.64

2-35
7.39
0.00
56.32
0.33
0.64

2-36
8.76
0.00
53.48
0.51
0.53

2-37
7.99
0.00
53.93
0.51
0.69

2-38
7.46
0.00
53.57
0.51
0.62

2-39
7.49
0.00
53.73
0.51
0.62

2-40
7.39
0.00
53.07
0.51
0.63

2-41
6.97
0.00
51.73
0.51
0.61

2-42
6.59
0.00
50.65
0.51
0.60

2-43
7.38
0.00
52.32
0.50
0.62

2-44
7.41
0.00
52.10
0.52
0.62

2-45
7.44
0.00
53.11
0.51
0.63

2-46
7.84
0.00
52.60
0.51
0.55

TABLE 2-2(2)

Glass composition (% by mass)

Li₂O/

Li₂O + Na₂O +
Gd₂O₃+

TiO₂/
(Li₂O + Na₂O +

No.
K₂O + Cs₂O
La₂O₃+ Y₂O₃
TiO₂+ Nb₂O₅
(TiO₂+ Nb₂O₅)
K₂O + Cs₂O)

2-47
7.60
0.00
52.74
0.51
0.60

2-48
7.34
0.00
52.73
0.51
0.63

2-49
7.41
0.00
52.57
0.50
0.62

2-50
7.44
0.00
52.37
0.52
0.63

2-51
7.36
0.00
52.87
0.51
0.66

2-52
7.83
0.00
52.61
0.51
0.58

2-53
7.33
0.00
52.66
0.51
0.62

2-54
7.39
0.00
53.08
0.51
0.63

2-55
7.63
0.00
53.02
0.51
0.64

2-56
7.34
0.00
52.69
0.51
0.63

2-57
7.20
0.00
51.60
0.51
0.59

2-58
7.63
0.00
52.53
0.52
0.60

2-59
4.55
0.00
52.57
0.57
0.47

2-60
4.42
0.00
53.91
0.46
0.47

2-61
3.13
0.00
54.76
0.60
0.79

2-62
4.38
0.00
57.59
0.50
0.47

2-63
7.62
0.00
52.45
0.52
0.60

2-64
7.19
0.00
51.52
0.51
0.59

2-65
7.19
0.00
51.44
0.51
0.59

2-66
7.10
0.00
48.86
0.53
0.59

2-67
7.59
0.00
50.90
0.51
0.60

2-68
7.64
0.00
50.49
0.55
0.60

2-69
7.16
0.00
50.02
0.50
0.59

2-70
7.22
0.00
49.61
0.53
0.59

2-71
7.60
2.88
52.30
0.52
0.60

2-72
7.69
1.81
52.87
0.52
0.60

2-73
7.17
2.80
51.38
0.51
0.59

2-74
7.26
1.77
51.90
0.51
0.59

2-75
7.17
0.00
51.40
0.51
0.59

2-76
7.23
0.00
51.81
0.51
0.59

2-77
7.26
0.00
52.01
0.51
0.59

2-78
7.26
1.77
51.69
0.50
0.59

2-79
7.27
1.77
51.63
0.51
0.59

2-80
7.26
1.77
51.61
0.50
0.59

2-81
7.27
1.77
51.49
0.51
0.59

2-82
7.33
0.00
51.83
0.51
0.59

2-83
6.77
0.00
51.12
0.51
0.57

2-84
7.78
0.00
51.60
0.51
0.50

2-85
8.37
0.00
52.32
0.51
0.53

2-86
7.65
0.00
51.42
0.51
0.60

2-87
7.72
0.00
51.01
0.55
0.60

2-88
1.55
0.00
50.15
0.55
1.00

2-89
1.18
0.00
49.66
0.55
1.00

2-90
0.63
0.00
51.31
0.57
1.00

2-91
0.62
0.00
52.18
0.50
1.00

TABLE 2-2(3)

Glass composition (% by mass)

Li₂O/

Li₂O + Na₂O +
Gd₂O₃+

TiO₂/
(Li₂O + Na₂O +

No.
K₂O + Cs₂O
La₂O₃+ Y₂O₃
TiO₂+ Nb₂O₅
(TiO₂+ Nb₂O₅)
K₂O + Cs₂O)

2-92
8.1
0
52.27
0.52362732
0.507407407

2-93
8.56
0
52
0.523461538
0.422897196

2-94
8.57
0
51.99
0.523369879
0.477246208

2-95
7.05
0
51.8
0.523552124
0.577304965

2-96
7.7
0
52.12
0.556600153
0.603896104

2-97
7.41
0
51.78
0.556778679
0.591093117

2-98
9.1
0
52.14
0.523590334
0.425274725

2-99
7.79
0
51.4
0.545525292
0.603337612

2-100
7.72
0
51.83
0.511672776
0.603626943

2-101
8.17
0
52.67
0.523447883
0.565483476

2-102
8.64
0
52.4
0.523473282
0.532407407

2-103
7.12
0
52.25
0.523444976
0.577247191

2-104
7.35
0
51.81
0.556649296
0.587755102

2-105
7.55
0
51.83
0.556627436
0.565562914

2-106
7.54
0
51.84
0.556712963
0.572944297

2-107
7.54
0
51.84
0.556712963
0.580901857

2-108
7.75
0
53.36
0.523425787
0.603870968

2-109
7.72
0
54.45
0.534802571
0.603626943

2-110
7.69
0
54.64
0.518850659
0.603381014

2-111
7.65
0
54.84
0.503282276
0.603921569

2-112
7.79
0
53.15
0.539981185
0.603337612

2-113
7.42
0
54.06
0.534961154
0.591644205

2-114
6.92
0
54.07
0.534862216
0.669075145

2-115
7.75
0
53.99
0.541211335
0.603870968

2-116
7.49
0
51.5
0.523495146
0.603471295

2-117
7.33
0
50.51
0.523460701
0.604365621

2-118
7.16
0
52.59
0.523483552
0.578212291

2-119
8.7
0
52.81
0.52357508
0.477011494

2-120
8.24
0
53.07
0.523459582
0.565533981

2-121
9.17
0
52.54
0.523601066
0.450381679

2-122
7.6
0
52.34
0.523500191
0.603947368

2-123
7.85
0
52.75
0.511658768
0.603821656

2-124
7.93
0
52.33
0.545576151
0.604035309

2-125
7.16
0
52.63
0.52365571
0.578212291

2-126
7.49
0
53.18
0.523505077
0.591455274

2-127
7.51
1.83
51.21
0.545596563
0.591211718

TABLE 2-2(4)

Glass composition (% by mass)

Li₂O/

Li₂O + Na₂O +
Gd₂O₃+

TiO₂/
(Li₂O + Na₂O +

No.
K₂O + Cs₂O
La₂O₃+ Y₂O₃
TiO₂+ Nb₂O₅
(TiO₂+ Nb₂O₅)
K₂O + Cs₂O)

2-128
7.76
0
51.3
0.545614035
0.604381443

2-129
7.78
0
53.52
0.523542601
0.604113111

2-130
7.91
0
52.44
0.50553013
0.604298357

2-131
7.94
0
52.22
0.522405209
0.604534005

2-132
7.97
0
52.02
0.539792388
0.60476788

2-133
8.01
0
51.8
0.557142857
0.604244694

2-134
7.97
0
53.24
0.523666416
0.616060226

2-135
8.21
0
53.1
0.52354049
0.567600487

2-136
8.45
0
52.95
0.523512748
0.550295858

2-137
7.69
0
52.87
0.523359183
0.603381014

2-138
7.56
0
52.95
0.491406988
0.604497354

2-139
7.5
0
53.33
0.46015376
0.604

2-140
7.35
0
52.19
0.523471929
0.59047619

2-141
7.29
0
51.8
0.523552124
0.59122085

2-142
7.32
0
51.98
0.523470566
0.591530055

2-143
7.27
0
51.64
0.523431448
0.591471802

2-144
7.63
0
52.58
0.523583111
0.604193971

2-145
7.59
0
52.16
0.523389571
0.60342556

2-146
7.6
0
52.36
0.523491215
0.603947368

2-147
7.55
0
51.96
0.5234796
0.60397351

2-148
7.65
0
52.64
0.523556231
0.603921569

2-149
7.62
0
52.65
0.525735992
0.603674541

2-150
7.63
0
52.65
0.524786325
0.604193971

2-151
7.59
0
52.63
0.525175755
0.602108037

2-152
7.62
0
52.43
0.523555216
0.603674541

2-153
7.66
0
52.75
0.523601896
0.604438642

2-154
7.63
0
52.42
0.522319725
0.604193971

2-155
7.63
0
52.75
0.525876777
0.604193971

2-156
6.7
0
51.19
0.50732565
0.562686567

2-157
6.65
0
50.94
0.507263447
0.563909774

2-158
6.55
0
50.23
0.507465658
0.563358779

2-159
6.83
0
50.5
0.507326733
0.576866764

2-160
5.95
0
48.91
0.507462687
0.531092437

2-161
6.21
0
49.18
0.507320049
0.547504026

2-162
6.46
0
49.47
0.507378209
0.563467492

2-163
7.10
7.49
44.78
0.576596695
0.591549296

TABLE 2-3(1)

Glass properties

Specific
Tg
λ80
λ70
λ5

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)

2-1
1.92564
23.09
3.639
605
556
460
376

2-2
1.91696
23.17
3.631
607
541
454
374

2-3
1.92371
23.31
3.656
615
572
467
377

2-4
1.92372
23.50
3.659
623
552
453
374

2-5
1.91272
23.06
3.418
583
548
456
374

2-6
1.92316
22.52
3.441
583
556
461
377

2-7
1.92293
22.63
3.449

541
455
376

2-8
1.90059
23.31
3.364
582
666
459
374

2-9
1.90590
22.97
3.372
571
N/A
478
374

2-10
1.90099
23.01
3.333

693
460
374

2-11
1.90643
22.88
3.341

N/A
500
375

2-12
1.87843
23.92
3.298
581
544
443
372

2-13
1.87702
23.79
3.295
575
N/A
461
373

2-14
1.88584
23.83
3.313
573
514
438
371

2-15
1.88581
24.02
3.329
582
528
439
371

2-16
1.88185
23.84
3.311

508
437
370

2-17
1.87894
23.70
3.266
582
526
443
372

2-18
1.87815
23.64
3.281

514
442
372

2-19
1.87486
23.77
3.262

505
437
372

2-20
1.87931
23.56
3.232

650
452
374

2-21
1.93027
22.53
3.429
580
562
473
379

2-22
1.92297
21.40
3.415
587
573
475
380

2-23
1.92238
22.77
3.429
594
564
471
379

2-24
1.90832
23.09
3.381
572
555
465
376

2-25
1.90598
22.63
3.372
578
563
471
378

2-26
1.92643
22.32
3.413
572
590
480
380

2-27
1.90072
23.33
3.393
580
560
469
377

2-28
1.90098
23.35
3.413
585
569
468
376

2-29
1.90423
23.18
3.392
585
570
470
377

2-30
1.90037
23.40
3.397
580
568
466
375

2-31
1.88576
23.40
3.343
578
553
465
375

2-32
1.87933
23.47
3.341

548
463
375

2-33
1.87258
23.57
3.336

549
461
374

2-34
1.89768
23.50
3.429

554
461
374

2-35
1.89943
23.74
3.458

559
461
373

2-36
1.89182
22.03
3.345

556
466
377

2-37
1.89719
23.33
3.345

564
469
377

2-38
1.89548
23.20
3.352

569
468
377

2-39
1.89641
23.24
3.356

549
464
377

2-40
1.90091
23.33
3.404
584
545
462
376

2-41
1.90124
23.49
3.457
586
565
469
377

2-42
1.90126
23.64
3.504
590
562
466
376

2-43
1.89547
23.57
3.406
586
561
464
375

2-44
1.89561
23.51
3.398
582
551
461
375

2-45
1.90107
23.33
3.402
581
551
465
376

2-46
1.89703
23.40
3.405
580
565
469
377

TABLE 2-3(2)

Glass properties

Specific
Tg
λ80
λ70
λ5

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)

2-47
1.89909
23.40
3.406
581
566
468
376

2-48
1.89968
23.36
3.408
582
569
466
376

2-49
1.8991
23.43
3.380
584
626
474
376

2-50
1.89915
23.42
3.375
586
579
468
376

2-51
1.90093
23.39
3.407
583
570
470
376

2-52
1.89667
23.45
3.400
582
557
465
376

2-53
1.89848
23.46
3.404
586
553
466
377

2-54
1.90705
23.43
3.417
578
561
472
378

2-55
1.90226
23.30
3.418
586
556
466
377

2-56
1.90216
23.37
3.425
589
551
464
376

2-57
1.89924
23.48
3.452
587
566
470
377

2-58
1.89899
23.53
3.399
583
565
469
377

2-59
1.95316
22.30
3.668
621
668
500
387

2-60
1.95215
21.79
3.720
618
N/A
524
385

2-61
2.00242
21.02
3.817
628
N/A
526
395

2-62
1.99474
20.78
3.787
616
N/A
520
393

2-63
1.90223
23.36
3.405
585
566
472
378

2-64
1.9023
23.44
3.459
589
564
469
377

2-65
1.90575
23.55
3.467
590
560
468
377

2-66
1.89824
23.79
3.498
589
549
462
376

2-67
1.89573
23.72
3.414
584
559
468
376

2-68
1.8959
23.61
3.399
586
569
472
377

2-69
1.89591
23.90
3.468
590
561
466
376

2-70
1.89598
23.79
3.452
588
555
465
376

2-71
1.90158
23.38
3.419
586
561
470
377

2-72
1.90054
23.36
3.382
586
561
468
377

2-73
1.90183
23.54
3.473
588
553
465
377

2-74
1.90052
23.54
3.436
587
551
464
376

2-75
1.89651
23.73
3.446
591
559
467
376

2-76
1.90232
23.46
3.456
581
564
471
377

2-77
1.90443
23.38
3.460
579
564
470
377

2-78
1.89848
23.60
3.433
586
554
468
377

2-79
1.89833
23.60
3.43
590
559
469
377

2-80
1.89847
23.69
3.437
590
548
466
376

2-81
1.89856
23.63
3.432
582
552
464
376

2-82
1.90048
23.64
3.438

571
475
377

2-83
1.89251
23.60
3.42

565
469
377

2-84
1.89666
23.51
3.438

558
467
377

2-85
1.90344
23.43
3.452

563
467
376

2-86
1.88811
23.77
3.379

575
466
375

2-87
1.88831
23.71
3.365

569
464
375

2-88
2.01059
21.43
4.05
661
N/A
538
393

2-89
2.00864
21.62
4.05
670
N/A
511
391

2-90
2.02551
20.90
4.06
677
N/A
549
399

2-91
2.02450
21.08
4.09
678
N/A
540
397

TABLE 2-3(3)

Glass propertes

No.
nd
νd
Specific weight
Tg (° C.)
λ80 (nm)
λ70 (nm)
λ5 (nm)

2-92
1.89542
23.34
3.396
580
557
467
377

2-93
1.8914
23.41
3.395
584
566
468
376

2-94
1.89093
23.44
3.384
581
566
468
376

2-95
1.89112
23.14
3.38
590
556
465
377

2-96
1.89951
23.23
3.38
583
551
468
378

2-97
1.89942
23.36
3.388
588
553
467
377

2-98
1.8865
23.56
3.356
582
549
465
376

2-99
1.88826
23.64
3.345
582
545
463
376

2-100
1.88811
23.75
3.361

546
464
376

2-101
1.89457
23.41
3.365

552
466
377

2-102
1.88953
23.5
3.351

544
465
377

2-103
1.89895
23.5
3.393

543
465
377

2-104
1.90024
23.75
3.376
588
558
469
378

2-105
1.90025
23.29
3.378
590
558
469
378

2-106
1.90023
23.29
3.379

553
467
378

2-107
1.89992
23.3
3.377

552
465
377

2-108
1.89897
23.3
3.359
583
561
472
378

2-109
1.90618
22.84
3.361
583
566
475
379

2-110
1.90622
22.85
3.369
583
570
474
379

2-111
1.90606
22.92
3.376
582
609
475
378

2-112
1.89901
23.27
3.351
584
566
472
377

2-113
1.90185
22.87
3.351
586
595
479
379

2-114
1.90097
22.89
3.347
587
670
486
380

2-115
1.90296
22.92
3.35
583
560
469
378

2-116
1.88883
23.63
3.372
585
556
466
377

2-117
1.8786
23.91
3.349
589
548
461
375

2-118
1.8907
23.4
3.342
590
598
475
377

2-119
1.89048
23.4
3.345
583
561
471
377

2-120
1.89424
23.38
3.346
582
564
471
377

2-121
1.88593
23.54
3.332
584
552
466
377

2-122
1.88866
23.57
3.337
585
557
464
376

2-123
1.89279
23.57
3.353
581
559
468
377

2-124
1.89292
23.51
3.337
580
552
464
376

2-125
1.89479
23.47
3.356
590
556
469
377

2-126
1.89777
23.26
3.354
582
578
474
378

2-127
1.8924
23.68
3.361
585
550
466
377

TABLE 2-3(4)

Glass properties

No.
nd
νd
Specific weight
Tg (° C.)
λ80 (nm)
λ70 (nm)
λ5 (nm)

2-128
1.89572
23.57
3.36
587
551
466
377

2-129
1.89843
23.24
3.354
581
546
454
372

2-130
1.88954
23.77
3.348
580
N/A
N/A
377

2-131
1.88958
23.73
3.343
582
N/A
668
376

2-132
1.88967
23.64
3.335
581
N/A
580
375

2-133
1.8876
23.54
3.326
582
N/A
546
374

2-134
1.89782
23.38
3.353
580
665
533
377

2-135
1.8959
23.39
3.353
583
N/A
556
377

2-136
1.89363
23.44
3.349
583
N/A
599
379

2-137
1.89767
23.49
3.364
584
N/A
628
379

2-138
1.89935
23.42
3.411
581
583
500
381

2-139
1.89904
23.53
3.43
584
578
490
378

2-140
1.89932
23.41
3.406
588
593
497
380

2-141
1.89937
23.62
3.426
587
580
500
381

2-142
1.90099
23.35
3.423
578
565
489
379

2-143
1.90325
23.32
3.426
588
591
500
381

2-144
1.90299
23.41
3.412
582
576
488
378

2-145
1.90284
23.41
3.437
583
570
490
379

2-146
1.90019
23.49
3.413
588
576
496
380

2-147
1.9003
23.51
3.433
586

2-148
1.90041
23.31
3.4
582
592
484
378

2-149
1.90055
23.31
3.4

591
483
378

2-150
1.9005
23.29
3.401
583
576
474
377

2-151
1.90049
23.29
3.4

572
473
377

2-152
1.89837
23.37
3.389
573
567
479
379

2-153
1.90132
23.29
3.4
582
569
483
379

2-154
1.89832
23.38
3.397
583
567
477
378

2-155
1.90151
23.25
3.402
583
558
473
378

2-156
1.89886
23.64
3.456
584
609
502
380

2-157
1.89904
23.74
3.464
594
587
488
378

2-158
1.89897
23.78
3.505
593
573
484
378

2-159
1.89946
23.69
3.496
590
562
478
378

2-160
1.89862
24.01
3.542
598
564
481
378

2-161
1.89917
23.93
3.534
589
567
482
379

2-162
1.89987
23.81
3.529
589
559
479
378

2-163
1.88787
24.93
3.536
592
537
454
372

Example 2-2

A lens blank was prepared by using each of the optical glasses prepared in Example 2-1 in accordance with a known method, and various lenses were prepared by processing the lens blank in accordance with a known method such as polishing.

The prepared optical lens was various lenses such as a planar lens, a biconvex lens, a biconcave lens, a plano-convex lens, a plano-concave lens, a concave meniscus lens, and a convex meniscus lens.

A secondary chromatic aberration was capable of being excellently corrected by combining various lenses with a lens including another type of optical glass.

Example 2-3

Each of the optical glasses prepared in Example 2-1 was processed into the shape of a rectangular thin plate having Length of 50 mm×Width of 20 mm×Thickness of 1.0 mm to obtain a light guide plate. The light guide plate was built in the head mounted display 1 illustrated in FIG. 2.

Example 3
Example 3-1

Glass samples having glass compositions shown in Tables 3-1(1), 3-1(2), 3-1(3), and 3-1(4) were prepared by the following procedure, and various evaluations were performed.

[Manufacturing of Optical Glass]

First, an oxide, a hydroxide, a carbonate, and a nitrate corresponding to structural components of the glass were prepared as a raw material, the raw materials were weighed and blended such that a glass composition of optical glass to be obtained was each of the compositions shown in Tables 3-1(1), 3-1(2), 3-1(3), and 3-1(4), and the raw materials were sufficiently mixed. A blended raw material (a batch raw material) obtained as described above was put in a platinum crucible, and was heated at 1350° C. to 1400° C. for 2 hours to be molten glass, and the molten glass was stirred, homogenized, and clarified, and then, was cast into a mold that was preheated to a suitable temperature. The cast glass was subjected to a heat treatment at approximately a glass transition temperature Tg for 30 minutes, and was allowed to cool in a furnace to a room temperature, and thus, a glass sample was obtained.

[Check of Glass Component Composition]

[Measurement of Optical Properties]

The obtained glass sample was further subjected to an annealing treatment at approximately the glass transition temperature Tg for approximately 30 minutes to 2 hours, and then, was cooled in the furnace to the room temperature at a temperature decrease rate of −30° C./hour, and thus, an annealed sample was obtained. In the obtained annealed sample, refractive indices nd, ng, nF, and nC, an Abbe's number νd, a specific weight, the glass transition temperature Tg, λ80, λ70, and λ5 were measured. Results are shown in Tables 3-2(1), 3-2(2), 3-2(3), and 3-2(4).

(i) Refractive Indices nd, ng, nF, and nC and Abbe's Number νd

νd=(nd−1)/(nF−nC)

(ii) Specific Weight

The specific weight was measured by an Archimedes method.

(iii) Glass Transition Temperature Tg

(iv) λ80, λ70, and λ5

TABLE 3-1(1)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
Sro
BaO

3-1
0.00
21.48
1.02
0.00
3.09
2.49
0.00
0.00
9.41
0.00
10.78

3-2
0.00
21.29
1.01
0.00
2.21
4.23
0.00
0.00
9.33
0.00
10.68

3-3
0.00
21.17
1.00
0.00
2.20
2.45
0.00
2.28
9.28
0.00
10.63

3-4
0.00
20.99
0.99
0.00
2.18
2.43
0.00
0.00
12.34
0.00
10.53

3-5
0.00
24.06
2.26
0.00
4.43
2.79
0.00
0.00
10.55
0.00
2.22

3-6
0.00
24.22
1.15
0.00
4.94
2.81
0.00
0.00
10.61
0.00
2.24

3-7
0.00
23.74
1.12
0.00
4.61
2.75
0.00
0.00
10.40
0.00
2.19

3-8
0.00
23.68
1.12
0.00
4.35
3.24
0.00
0.00
10.38
0.00
2.19

3-9
0.00
23.65
1.12
0.00
4.35
2.74
0.00
0.65
10.36
0.00
2.18

3-10
0.00
23.59
1.12
0.00
4.34
2.73
0.00
0.00
11.23
0.00
2.18

3-11
0.00
24.22
1.15
0.00
4.92
2.80
0.00
0.00
10.61
0.00
0.00

3-12
0.00
24.11
1.14
0.00
4.68
2.79
0.68
0.00
10.56
0.00
0.00

3-13
0.00
26.33
1.15
0.00
4.95
2.82
0.00
0.00
10.68
0.00
0.00

3-14
0.00
24.58
2.31
0.00
4.99
2.85
0.00
0.00
10.77
0.00
0.00

3-15
0.00
26.80
1.17
0.00
5.04
2.87
0.00
0.00
10.87
0.00
0.00

3-16
0.00
25.02
2.35
0.00
5.08
2.90
0.00
0.00
10.96
0.00
0.00

3-17
0.00
27.39
1.20
0.00
5.65
2.94
0.00
0.00
11.11
0.00
0.00

3-18
0.00
27.01
1.18
0.00
5.08
2.90
0.00
0.00
12.83
0.00
0.00

3-19
0.00
27.24
1.19
0.00
5.12
3.96
0.00
0.00
11.05
0.00
0.00

3-20
0.00
22.31
1.15
0.00
4.92
2.81
0.00
0.00
12.44
0.00
0.00

3-21
0.00
23.90
1.13
0.00
4.38
2.77
0.00
0.00
12.26
0.00
0.00

3-22
0.00
23.59
1.12
0.00
3.85
2.73
0.00
0.00
13.87
0.00
0.00

3-23
0.00
24.74
1.17
0.00
5.52
2.86
0.00
0.00
10.84
0.00
0.00

3-24
0.00
23.73
1.12
0.00
3.87
2.75
2.99
0.00
10.40
0.00
0.00

3-25
0.00
22.49
1.16
0.00
4.96
3.84
0.00
0.00
10.71
0.00
0.00

3-26
0.00
24.42
1.16
0.00
4.96
3.84
0.00
0.00
8.87
0.00
0.00

3-27
0.00
25.96
1.14
0.00
4.64
2.78
0.00
0.00
10.53
1.66
0.00

3-28
0.00
25.75
1.13
0.00
4.60
2.76
0.00
0.00
10.45
0.00
2.44

3-29
0.00
25.88
1.13
0.00
4.62
2.77
0.00
0.00
10.50
0.00
0.00

3-30
0.00
25.89
1.13
0.00
4.86
2.77
0.00
0.00
10.50
0.00
0.00

3-31
0.00
25.84
1.13
0.00
3.87
3.21
2.44
0.00
10.48
0.00
0.00

3-32
0.00
25.46
1.11
0.00
4.78
2.73
0.00
0.00
10.32
0.00
0.00

3-33
0.00
25.04
1.10
0.00
4.71
2.68
0.00
0.00
10.15
0.00
0.00

3-34
0.00
26.05
1.14
0.00
4.68
1.62
2.46
0.00
10.57
0.00
0.00

3-35
0.00
26.27
1.15
0.00
5.51
0.00
2.48
0.00
10.66
0.00
0.00

3-36
1.15
26.10
1.14
0.00
4.66
2.80
0.00
0.00
10.58
0.00
0.00

3-37
0.00
26.18
1.15
0.83
4.68
2.81
0.00
0.00
10.62
0.00
0.00

3-38
0.00
25.86
1.13
0.00
4.62
2.77
0.00
0.00
10.49
0.83
1.23

3-39
0.00
25.20
1.10
0.00
4.27
2.70
0.00
0.00
10.22
0.00
4.78

3-40
0.00
24.67
1.08
0.00
3.95
2.64
0.00
0.00
10.00
0.00
7.01

3-41
0.00
26.26
1.13
0.00
4.61
2.77
0.00
0.00
10.46
0.00
2.45

3-42
0.00
26.39
1.13
0.00
4.63
2.78
0.00
0.00
10.51
0.00
2.46

3-43
0.00
25.87
1.13
0.00
4.67
2.77
0.00
0.00
10.49
0.00
1.96

3-44
0.00
25.62
1.12
0.00
4.34
2.75
0.75
0.00
10.39
0.00
2.43

3-45
0.00
25.69
1.12
0.00
4.59
2.26
0.75
0.00
10.42
0.00
2.43

3-46
0.28
25.68
1.12
0.00
4.59
2.75
0.00
0.00
10.42
0.00
2.43

3-47
0.00
26.41
1.13
0.00
4.63
2.78
0.00
0.00
10.51
0.00
0.00

3-48
0.00
26.51
1.14
0.00
4.65
2.79
0.00
0.00
10.56
0.00
0.00

No.
TiO₂
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

3-1
26.46
23.47
1.80
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-2
26.21
23.26
1.78
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-3
26.09
23.13
1.77
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-4
25.85
22.93
1.76
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-5
29.64
22.03
2.02
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-6
29.83
22.17
2.03
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-7
29.25
25.94
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-8
29.17
25.87
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-9
29.12
25.83
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-10
29.04
25.77
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-11
29.84
26.46
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-12
29.70
26.34
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-13
27.44
26.63
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-14
27.64
26.86
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-15
30.55
22.70
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-16
30.80
22.89
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-17
28.51
23.20
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-18
28.12
22.88
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-19
28.37
23.07
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-20
29.87
26.50
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-21
29.44
26.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-22
29.06
25.78
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-23
27.84
27.03
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-24
29.22
25.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-25
30.13
26.71
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-26
30.07
26.68
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-27
27.03
26.26
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-28
26.82
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-29
26.96
26.17
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-30
24.40
30.45
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-31
26.90
26.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-32
21.48
34.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-33
18.66
37.66
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-34
27.13
26.35
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-35
27.36
26.57
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-36
27.18
26.39
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-37
27.26
26.47
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-38
26.92
26.15
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-39
26.24
25.49
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-40
25.70
24.95
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-41
26.23
26.09
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-42
26.97
25.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-43
26.95
26.16
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-44
26.69
25.91
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-45
26.76
25.98
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-46
26.76
25.97
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-47
26.36
26.21
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-48
27.11
25.26
1.98
0.00
0.00
0.00
0.00
0.00
100.00
0.03

TABLE 3-1(2)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO

3-49
0.00
25.75
1.13
0.00
4.84
1.77
0.75
0.00
10.45
0.00
2.44

3-50
0.00
25.62
1.12
0.00
4.58
1.76
1.49
0.00
10.39
0.00
2.43

3-51
0.00
26.61
0.57
0.00
4.58
2.75
0.00
0.00
10.40
0.00
2.43

3-52
0.00
24.90
1.69
0.00
4.62
2.77
0.00
0.00
10.49
0.00
2.45

3-53
0.00
25.84
0.58
0.00
4.86
2.77
0.00
0.00
10.48
0.00
2.45

3-54
0.00
25.67
0.57
0.00
4.59
2.75
0.00
0.00
11.30
0.00
2.43

3-55
0.00
25.14
1.10
0.00
4.26
2.21
0.73
0.00
10.19
0.00
4.77

3-56
0.00
25.80
1.13
0.00
4.61
2.27
0.75
0.00
10.46
0.00
2.45

3-57
0.00
16.53
0.93
0.00
2.05
2.28
0.00
0.00
8.63
0.00
17.95

3-58
0.00
19.40
0.92
0.00
2.02
0.64
0.00
0.00
8.50
0.00
17.68

3-59
0.00
20.71
0.98
0.00
2.15
2.40
0.00
0.00
9.07
0.00
10.39

3-60
0.00
20.12
0.95
0.00
2.09
2.33
0.00
0.00
8.82
0.00
10.10

3-61
0.00
16.12
0.91
0.00
2.00
0.63
0.00
0.00
8.41
0.00
17.50

3-62
0.00
16.71
0.94
0.00
2.47
0.66
0.00
0.00
8.72
0.00
14.07

3-63
0.00
16.71
0.94
0.00
2.07
2.31
0.00
0.00
8.72
0.00
9.99

3-64
0.00
16.35
0.92
0.00
2.22
0.64
0.00
0.00
8.53
0.00
17.75

3-65
0.00
16.06
0.90
0.00
1.99
0.63
0.00
0.00
8.38
0.00
19.42

3-66
0.00
25.76
1.13
0.00
4.60
2.27
0.75
0.00
10.45
0.00
0.00

3-67
0.00
25.10
1.10
0.00
4.25
2.21
0.73
0.00
10.18
0.00
2.38

3-68
0.00
25.06
1.10
0.00
4.25
2.21
0.73
0.00
10.16
0.00
0.00

3-69
0.00
24.80
1.09
0.00
4.20
2.18
0.72
0.00
10.06
0.00
4.70

3-70
0.00
25.62
1.12
0.00
4.58
2.26
0.75
0.00
10.39
0.00
2.43

3-71
0.00
25.84
1.13
0.00
4.62
2.27
0.75
0.00
10.48
0.00
2.45

3-72
0.00
24.97
1.09
0.00
4.23
2.20
0.73
0.00
10.13
0.00
4.73

3-73
0.00
25.17
1.10
0.00
4.27
2.22
0.73
0.00
10.21
0.00
4.77

3-74
0.00
25.68
1.12
0.00
4.59
2.26
0.75
0.00
10.42
0.00
0.00

3-75
0.00
25.96
1.14
0.00
4.64
2.29
0.76
0.00
10.53
0.00
0.00

3-76
0.00
25.03
1.10
0.00
4.24
2.20
0.73
0.00
10.15
0.00
2.37

3-77
0.00
25.30
1.11
0.00
4.29
2.23
0.74
0.00
10.26
0.00
2.40

3-78
0.00
25.97
0.56
0.00
4.24
2.20
0.73
0.00
10.15
0.00
4.75

3-79
0.00
24.30
1.65
0.00
4.28
2.22
0.73
0.00
10.23
0.00
4.78

3-80
0.00
23.45
2.20
0.00
4.29
2.23
0.74
0.00
10.28
0.00
4.80

3-81
0.00
25.50
1.11
0.00
4.29
2.23
0.74
0.00
10.27
0.00
2.40

3-82
0.00
25.54
1.11
0.00
4.30
2.23
0.74
0.00
10.28
0.00
2.40

3-83
0.00
25.32
1.11
0.00
4.29
2.23
0.74
0.00
10.53
0.00
2.40

3-84
0.00
25.39
1.11
0.00
4.30
2.23
0.74
0.00
10.56
0.00
2.41

3-85
0.00
25.32
1.11
0.00
4.36
2.23
0.74
0.00
10.27
0.00
3.12

3-86
0.00
26.81
1.09
0.00
3.84
2.20
0.73
0.00
10.12
0.00
3.08

3-87
0.00
25.19
1.10
0.00
3.87
3.18
0.73
0.00
10.22
0.00
3.10

3-88
0.00
23.65
1.12
0.00
4.40
3.23
0.74
0.00
10.36
0.00
3.15

3-89
0.00
26.85
1.13
0.00
4.62
2.28
0.75
0.00
10.50
0.00
2.45

3-90
0.00
27.07
1.14
0.00
4.66
2.30
0.76
0.00
10.59
0.00
2.47

3-91
0.00
18.82
0.89
0.00
1.62
0.00
0.00
0.00
8.25
2.32
17.16

3-92
0.00
15.03
0.85
0.00
1.55
0.00
0.00
0.00
6.50
2.21
16.32

3-93
0.00
14.89
0.84
0.00
1.18
0.00
0.00
0.00
7.77
2.18
16.16

3-94
0.00
14.55
0.82
0.00
0.63
0.00
0.00
0.00
7.59
2.14
15.80

3-95
0.00
14.70
0.83
0.00
0.00
2.41
0.00
0.00
7.67
2.16
15.96

No.
TiO₂
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

3-49
26.82
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-50
26.69
25.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-51
26.72
25.94
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-52
26.93
26.15
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-53
26.90
26.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-54
26.73
25.96
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-55
26.18
25.42
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-56
27.50
25.03
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-57
28.46
21.52
1.65
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-58
28.03
21.19
1.62
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-59
29.94
22.63
1.73
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-60
24.78
29.13
1.68
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-61
31.84
20.98
1.61
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-62
33.01
21.75
1.67
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-63
28.77
28.82
1.67
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-64
32.31
21.28
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-65
31.72
20.90
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-66
27.46
24.99
0.00
0.00
0.00
0.00
2.59
0.00
100.00
0.03

3-67
26.14
25.38
0.00
0.00
0.00
0.00
2.53
0.00
100.00
0.03

3-68
26.09
25.35
0.00
0.00
0.00
0.00
5.05
0.00
100.00
0.03

3-69
25.82
23.04
0.00
0.00
3.39
0.00
0.00
0.00
100.00
0.03

3-70
26.04
24.86
1.95
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-71
27.54
22.95
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-72
24.77
25.25
1.90
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-73
26.22
23.39
1.92
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-74
27.38
24.92
0.00
0.00
0.00
2.88
0.00
0.00
100.00
0.03

3-75
27.68
25.19
0.00
0.00
0.00
0.00
0.00
1.81
100.00
0.03

3-76
26.07
25.31
0.00
0.00
0.00
2.80
0.00
0.00
100.00
0.03

3-77
26.33
25.57
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

3-78
26.08
25.32
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-79
26.29
25.52
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-80
26.39
25.62
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-81
26.10
25.59
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

3-82
26.41
25.22
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

3-83
26.00
25.61
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

3-84
26.44
25.05
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

3-85
26.54
25.29
0.00
0.00
0.00
0.00
1.02
0.00
100.00
0.03

3-86
26.18
24.94
0.00
0.00
0.00
0.00
1.01
0.00
100.00
0.03

3-87
26.43
25.17
0.00
0.00
0.00
0.00
1.01
0.00
100.00
0.03

3-88
26.80
25.52
0.00
0.00
0.00
0.00
1.03
0.00
100.00
0.03

3-89
26.31
25.11
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-90
27.83
23.18
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-91
28.80
20.56
1.58
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-92
27.41
22.74
7.39
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-93
27.14
22.52
7.32
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-94
29.29
22.02
7.16
0.00
0.00
0.00
0.00
0.00
100.00
0.03

3-95
26.80
22.24
7.23
0.00
0.00
0.00
0.00
0.00
100.00
0.03

TABLE 3-1(3)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
Sro
BaO

3-96
0
25.67
1.12
0
4.11
3.24
0.75
0
10.41
0
2.43

3-97
0
25.54
1.12
0
3.62
4.2
0.74
0
10.36
0
2.42

3-98
0
25.54
1.12
0
4.09
2.25
2.23
0
10.36
0
2.42

3-99
0
27.32
1.11
0
4.07
2.24
0.74
0
10.31
0
2.41

3-100
0
26.02
1.14
0
4.65
2.29
0.76
0
10.55
0
2.47

3-101
0
25.85
1.13
0
4.38
2.28
0.75
0
11.38
0
2.45

3-102
0
25.6
1.12
0
3.87
2.25
2.98
0
10.83
0
1.21

3-103
0
27.28
1.15
0
4.7
2.32
0.77
0
11.13
0
1.25

3-104
0
27.04
1.14
0
4.66
2.3
0.76
0
11.03
0
1.24

3-105
0
25.86
1.13
0
4.62
1.29
2.26
0
10.94
0
1.23

3-106
0
25.73
1.13
0
4.6
0.29
3.75
0
10.88
0
1.22

3-107
0
25.66
1.12
0
4.11
2.26
0.75
0
12.63
0
1.22

3-108
0
26.1
1.13
0
4.32
2.28
0.75
0
11.39
0
1.23

3-109
0
25.88
1.13
0
4.27
2.53
0.75
0
11.39
0
1.23

3-110
0
25.88
1.13
0
4.32
2.28
0.94
0
11.39
0
1.23

3-111
0
25.88
1.13
0
4.38
2.03
1.13
0
11.39
0
1.23

3-112
0
26.2
1.15
0
4.68
2.31
0.76
0
11.54
0
0

3-113
0
26.1
1.14
0
4.66
2.3
0.76
0
10.59
0
0

3-114
0
25.99
1.14
0
4.64
2.29
0.76
0
10.54
0
0

3-115
0
25.88
1.13
0
4.62
2.28
0.75
0
10.5
0
0

3-116
0
26.32
1.15
0
4.7
2.32
0.77
0
11.59
0
0

3-117
0
26.88
1.13
0
4.39
2.28
0.75
0
10.51
0
0

3-118
0
27.37
1.13
0
4.63
1.54
0.75
0
10.51
0
0

3-119
0
26.49
1.15
0
4.68
2.31
0.76
0
10.62
0
0

3-120
0
27.24
1.11
0
4.52
2.23
0.74
0
10.26
0
2.4

3-121
0
27.75
1.13
0
4.14
2.27
0.75
0
11.37
0
0

3-122
0
25.93
1.14
0
4.15
2.28
2.27
0
11.42
0
0

3-123
0
26.07
1.14
0
4.66
1.3
2.28
0
11.48
0
0

3-124
0
25.8
1.13
0
4.13
1.28
3.76
0
11.36
0
0

3-125
0
27.61
1.13
0
4.59
2.26
0.75
0
11.32
0
0

3-126
0
26.55
1.16
0
4.74
2.34
0.77
0
11.69
0
0

3-127
0
26.78
1.17
0
4.79
2.36
0.78
0
11.79
0
0

3-128
0
26.81
1.13
0
4.14
2.27
0.75
0
12.27
0
0

3-129
0
26.12
1.71
0
4.43
2.3
0.76
0
11.5
0
0

3-130
0
26.2
1.71
0
4.44
2.31
0.76
0
11.54
0
0

3-131
0
26.24
1.15
0
4.69
2.31
0.76
0
11.55
0
0

3-132
0
25.99
1.6
0
4.7
2.31
0.77
0
11.11
0
0

3-133
0
26.72
1.17
0
4.78
2.35
0.78
0
11.76
0
0

3-134
0
26.84
1.18
0
4.8
2.36
0.78
0
11.82
0
0

No.
TiO₂
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

3-96
27.37
24.9
0
0
0
0
0
0
100
0.03

3-97
27.22
24.78
0
0
0
0
0
0
100
0.03

3-98
27.21
24.78
0
0
0
0
0
0
100
0.03

3-99
27.12
24.68
0
0
0
0
0
0
100
0.03

3-100
29.01
23.11
0
0
0
0
0
0
100
0.03

3-101
28.83
22.95
0
0
0
0
0
0
100
0.03

3-102
27.3
24.84
0
0
0
0
0
0
100
0.03

3-103
28.04
23.36
0
0
0
0
0
0
100
0.03

3-104
26.52
25.31
0
0
0
0
0
0
100
0.03

3-105
27.57
25.1
0
0
0
0
0
0
100
0.03

3-106
27.43
24.97
0
0
0
0
0
0
100
0.03

3-107
27.35
24.9
0
0
0
0
0
0
100
0.03

3-108
28.84
22.97
0.99
0
0
0
0
0
100
0.03

3-109
28.85
22.98
0.99
0
0
0
0
0
100
0.03

3-110
28.86
22.98
0.99
0
0
0
0
0
100
0.03

3-111
28.86
22.98
0.99
0
0
0
0
0
100
0.03

3-112
27.93
25.43
0
0
0
0
0
0
100
0.03

3-113
29.12
25.33
0
0
0
0
0
0
100
0.03

3-114
28.35
26.29
0
0
0
0
0
0
100
0.03

3-115
27.6
27.24
0
0
0
0
0
0
100
0.03

3-116
28.7
24.45
0
0
0
0
0
0
100
0.03

3-117
28.92
25.14
0
0
0
0
0
0
100
0.03

3-118
28.92
25.15
0
0
0
0
0
0
100
0.03

3-119
29.22
24.77
0
0
0
0
0
0
100
0.03

3-120
26.96
24.54
0
0
0
0
0
0
100
0.03

3-121
27.53
25.06
0
0
0
0
0
0
100
0.03

3-122
27.65
25.16
0
0
0
0
0
0
100
0.03

3-123
27.78
25.29
0
0
0
0
0
0
100
0.03

3-124
27.51
25.03
0
0
0
0
0
0
100
0.03

3-125
27.4
24.94
0
0
0
0
0
0
100
0.03

3-126
26.99
25.76
0
0
0
0
0
0
100
0.03

3-127
28.55
23.78
0
0
0
0
0
0
100
0.03

3-128
27.56
25.07
0
0
0
0
0
0
100
0.03

3-129
27.84
25.34
0
0
0
0
0
0
100
0.03

3-130
27.94
23.27
0
0
0
0
0
1.83
100
0.03

3-131
27.99
23.31
2
0
0
0
0
0
100
0.03

3-132
28.02
25.5
0
0
0
0
0
0
100
0

3-133
26.51
25.93
0
0
0
0
0
0
100
0

3-134
27.28
24.94
0
0
0
0
0
0
100
0

TABLE 3-1(4)

Glass composition (% by mass)

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO

3-135
0
26.96
1.18
0
4.82
2.37
0.78
0
11.87
0
0

3-136
0
27.08
1.19
0
4.84
2.38
0.79
0
11.92
0
0

3-137
0
26.14
1.14
0
4.91
2.3
0.76
0
11.51
0
0

3-138
0
26.07
1.14
0
4.66
2.79
0.76
0
11.48
0
0

3-139
0
26.01
1.14
0
4.65
2.29
1.51
0
11.45
0
0

3-140
0
25.97
1.14
0
4.64
2.29
0.76
0
12.33
0
0

3-141
0
25.58
1.12
0
4.57
2.25
0.74
0
10.37
0
2.42

3-142
0
25.37
1.11
0
4.53
2.23
0.74
0
10.29
0
2.4

3-143
0
25.63
1.12
0
4.34
2.26
0.75
0
11.28
0
2.43

3-144
0
25.44
1.11
0
4.31
2.24
0.74
0
10.32
1.63
2.41

3-145
0
25.53
1.12
0
4.33
2.25
0.74
0
10.35
0
2.42

3-146
0
25.36
1.11
0
4.3
2.23
0.74
0
10.29
0
2.4

3-147
0
24.85
1.13
0
4.61
2.27
0.75
0
11.36
0
2.45

3-148
0
24.67
1.12
0
4.58
2.26
0.75
0
10.39
1.64
2.43

3-149
0
25.71
0.57
0
4.59
2.26
0.75
0
11.32
0
2.44

3-150
0
25.52
0.57
0
4.56
2.25
0.74
0
10.35
1.63
2.42

3-151
0
25.65
1.13
0
4.62
2.28
0.75
0
10.48
0
2.45

3-152
0
25.72
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44

3-153
0
25.69
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44

3-154
0
25.76
1.13
0
4.57
2.27
0.75
0
10.45
0
2.44

3-155
0
25.94
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44

3-156
0
25.51
1.13
0
4.63
2.28
0.75
0
10.5
0
2.45

3-157
0
25.9
1.13
0
4.61
2.27
0.75
0
10.47
0
2.45

3-158
0
25.59
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44

3-159
0
13.35
0.93
0
2.83
0.65
0
0
8.61
0
17.92

3-160
0
13.42
0.93
0
2.06
2.29
0
0
8.66
0
18.01

3-161
0
13.61
0.95
0
2.09
2.32
0
0
8.78
0
18.27

3-162
0
13.33
0.93
0
2.04
2.27
0
0
8.6
0
17.89

3-163
0
13.52
0.94
0
2.07
2.3
0
0
8.72
0
18.14

3-164
0
13.48
0.94
0
2.46
1.48
0
0
8.7
0
18.09

3-165
0
13.54
0.94
0
2.87
0.66
0
0
8.73
0
18.17

3-166
0
13.58
0.95
0
3.2
0
0
0
8.76
0
18.23

3-167
0
24.94
1.09
0
3.77
2.2
0.73
1.24
10.11
0
4.73

3-168
0
24.82
1.09
0
3.75
2.18
0.72
0
11.79
0
4.71

3-169
0
24.46
1.07
0
3.69
2.15
0.71
0
9.92
3.13
4.64

3-170
0
24.61
1.08
0
3.94
2.17
0.72
0
9.98
0
7

3-171
0
23.82
1.04
0
3.16
2.1
0.69
0
9.66
6.1
4.52

3-172
0
23.96
1.05
0
3.4
2.11
0.7
0
9.72
3.07
6.81

3-173
0
24.1
1.06
0
3.64
2.12
0.7
0
9.77
0
9.14

3-174
0
24.2
1.06
0
4.1
2.13
0.7
0
9.81
0
4.59

3-175
0
24.79
1.09
0
4.2
2.18
0.72
0
10.05
0
4.7

3-176
0
24.68
1.08
0
4.18
2.17
0.72
0
10.01
0
4.68

3-177
0
24.47
1.07
0
4.15
2.15
0.71
0
9.93
0
4.64

3-178
0
24.82
1.09
0
4.21
2.19
0.72
0
10.07
0
4.71

No.
TiO₂
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

3-135
28.08
23.94
0
0
0
0
0
0
100
0

3-136
28.86
22.94
0
0
0
0
0
0
100
0

3-137
27.88
25.36
0
0
0
0
0
0
100
0

3-138
27.8
25.3
0
0
0
0
0
0
100
0

3-139
27.72
25.23
0
0
0
0
0
0
100
0

3-140
27.67
25.2
0
0
0
0
0
0
100
0

3-141
26.02
26.93
0
0
0
0
0
0
100
0.03

3-142
24.54
28.79
0
0
0
0
0
0
100
0.03

3-143
27.32
24.87
0
0
0
0
0
0
100
0.03

3-144
27.12
24.68
0
0
0
0
0
0
100
0.03

3-145
27.21
24.77
0
1.28
0
0
0
0
100
0.03

3-146
27.03
24.61
1.93
0
0
0
0
0
100
0.03

3-147
27.53
25.05
0
0
0
0
0
0
100
0.03

3-148
27.3
24.86
0
0
0
0
0
0
100
0.03

3-149
27.41
24.95
0
0
0
0
0
0
100
0.03

3-150
27.2
24.76
0
0
0
0
0
0
100
0.03

3-151
27.56
25.08
0
0
0
0
0
0
100
0.03

3-152
27.68
24.97
0
0
0
0
0
0
100
0.03

3-153
27.63
25.02
0
0
0
0
0
0
100
0.03

3-154
27.64
24.99
0
0
0
0
0
0
100
0.03

3-155
27.45
24.98
0
0
0
0
0
0
100
0.03

3-156
27.62
25.13
0
0
0
0
0
0
100
0.03

3-157
27.38
25.04
0
0
0
0
0
0
100
0.03

3-158
27.74
25.01
0
0
0
0
0
0
100
0.03

3-159
32.59
21.47
1.65
0
0
0
0
0
100
0.03

3-160
34.89
18.09
1.65
0
0
0
0
0
100
0.03

3-161
37.52
14.78
1.68
0
0
0
0
0
100
0.03

3-162
33.6
19.7
1.64
0
0
0
0
0
100
0.03

3-163
36.19
16.45
1.67
0
0
0
0
0
100
0.03

3-164
35.03
18.16
1.66
0
0
0
0
0
100
0.03

3-165
35.18
18.24
1.67
0
0
0
0
0
100
0.03

3-166
35.31
18.3
1.67
0
0
0
0
0
100
0.03

3-167
25.97
25.22
0
0
0
0
0
0
100
0.03

3-168
25.84
25.1
0
0
0
0
0
0
100
0.03

3-169
25.49
24.74
0
0
0
0
0
0
100
0.03

3-170
25.62
24.88
0
0
0
0
0
0
100
0.03

3-171
24.82
24.09
0
0
0
0
0
0
100
0.03

3-172
24.95
24.23
0
0
0
0
0
0
100
0.03

3-173
25.1
24.37
0
0
0
0
0
0
100
0.03

3-174
21.62
24.48
0
0
0
0
7.31
0
100
0.03

3-175
25.82
18.96
0
0
0
0
7.49
0
100
0.03

3-176
25.69
16.85
0
0
0
0
9.94
0
100
0.03

3-177
25.5
17.51
0
0
0
9.87
0
0
100
0.03

3-178
25.83
16.54
0
0
0
3.89
3.5
2.43
100
0.03

TABLE 3-2(1)

Glass composition

Glass properties
(% by mass)

Specific
Tg
λ80
λ70
λ5
nd/Specific
TiO₂+
TiO₂/(TiO₂+

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
weight
Nb₂O₅
Nb₂O₅)

3-1
1.92564
23.09
3.639
605
556
460
376
0.53
49.93
0.53

3-2
1.91696
23.17
3.631
607
541
454
374
0.53
49.47
0.53

3-3
1.92371
23.31
3.656
615
572
467
377
0.53
49.22
0.53

3-4
1.92372
23.50
3.659
623
552
453
374
0.53
48.78
0.53

3-5
1.91048

3.410
580
554
458
375
0.56
51.67
0.57

3-6
1.91272
23.06
3.418
583
548
456
374
0.56
52.00
0.57

3-7
1.92316
22.52
3.441
583
556
461
377
0.56
55.19
0.53

3-8
1.92110

3.441

555
459
376
0.56
55.04
0.53

3-9
1.92309

3.448

N/A
497
378
0.56
54.95
0.53

3-10
1.92293
22.63
3.449

541
455
376
0.56
54.81
0.53

3-11
1.92337

3.400
580
N/A
484
378
0.57
56.30
0.53

3-12
1.91933

3.394
577
549
459
376
0.57
56.04
0.53

3-13
1.90059
23.31
3.364
582
666
459
374
0.56
54.07
0.51

3-14
1.90590
22.97
3.372
571
N/A
478
374
0.57
54.50
0.51

3-15
1.90099
23.01
3.333

693
460
374
0.57
53.25
0.57

3-16
1.90643
22.88
3.341

N/A
500
375
0.57
53.69
0.57

3-17
1.88584
23.83
3.313
573
514
438
371
0.57
51.71
0.55

3-18
1.88581
24.02
3.329
582
528
439
371
0.57
51.00
0.55

3-19
1.88185
23.84
3.311

508
437
370
0.57
51.44
0.55

3-20
1.93027
22.53
3.429
580
562
473
379
0.56
56.37
0.53

3-21
1.92297
21.40
3.415
587
573
475
380
0.56
55.56
0.53

3-22
1.92238
22.77
3.429
594
564
471
379
0.56
54.84
0.53

3-23
1.90832
23.09
3.381
572
555
465
376
0.56
54.87
0.51

3-24
1.90598
22.63
3.372
578
563
471
378
0.57
55.14
0.53

3-25
1.92643
22.32
3.413
572
590
480
380
0.56
56.84
0.53

3-26
1.91948

3.382

666
487
381
0.57
56.75
0.53

3-27
1.90072
23.33
3.393
580
560
469
377
0.56
53.29
0.51

3-28
1.90098
23.35
3.413
585
569
468
376
0.56
52.87
0.51

3-29
1.90423
23.18
3.392
585
570
470
377
0.56
53.13
0.51

3-30
1.90037
23.40
3.397
580
568
466
375
0.56
54.85
0.44

3-31
1.88576
23.40
3.343
578
553
465
375
0.56
53.03
0.51

3-32
1.89768
23.50
3.429

554
461
374
0.55
55.60
0.39

3-33
1.89943
23.74
3.458

559
461
373
0.55
56.32
0.33

3-34
1.89182
22.03
3.345

556
466
377
0.57
53.48
0.51

3-35
1.89719
23.33
3.345

564
469
377
0.57
53.93
0.51

3-36
1.89548
23.20
3.352

569
468
377
0.57
53.57
0.51

3-37
1.89641
23.24
3.356

549
464
377
0.57
53.73
0.51

3-38
1.90091
23.33
3.404
584
545
462
376
0.56
53.07
0.51

3-39
1.90124
23.49
3.457
586
565
469
377
0.55
51.73
0.51

3-40
1.90126
23.64
3.504
590
562
466
376
0.54
50.65
0.51

3-41
1.89547
23.57
3.406
586
561
464
375
0.56
52.32
0.50

3-42
1.89561
23.51
3.398
582
551
461
375
0.56
52.10
0.52

3-43
1.90107
23.33
3.402
581
551
465
376
0.56
53.11
0.51

3-44
1.89703
23.40
3.405
580
565
469
377
0.56
52.60
0.51

3-45
1.89909
23.40
3.406
581
566
468
376
0.56
52.74
0.51

3-46
1.89968
23.36
3.408
582
569
466
376
0.56
52.73
0.51

3-47
1.8991
23.43
3.380
584
626
474
376
0.56
52.57
0.50

3-48
1.89915
23.42
3.375
586
579
468
376
0.56
52.37
0.52

TABLE 3-2(2)

Glass composition

Glass properties
(% by mass)

Specific
Tg
λ80
λ70
λ5
nd/Specific
TiO₂+
TiO₂/(TiO₂+

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
weight
Nb₂O₅
Nb₂O₅)

3-49
1.90093
23.39
3.407
583
570
470
376
0.56
52.87
0.51

3-50
1.89667
23.45
3.400
582
557
465
376
0.56
52.61
0.51

3-51
1.89848
23.46
3.404
586
553
466
377
0.56
52.66
0.51

3-52
1.90705
23.43
3.417
578
561
472
378
0.56
53.08
0.51

3-53
1.90226
23.30
3.418
586
556
466
377
0.56
53.02
0.51

3-54
1.90216
23.37
3.425
589
551
464
376
0.56
52.69
0.51

3-55
1.89924
23.48
3.452
587
566
470
377
0.55
51.60
0.51

3-56
1.89899
23.53
3.399
583
565
469
377
0.56
52.53
0.52

3-57
1.9636
23.38
3.858
621
648
499
387
0.51
49.98
0.57

3-58
1.95856
22.26
3.830
639
656
499
387
0.51
49.22
0.57

3-59
1.95316
22.30
3.668
621
668
500
387
0.53
52.57
0.57

3-60
1.95215
21.79
3.720
618
N/A
524
385
0.52
53.91
0.46

3-61
1.99951
21.92
3.890
636
N/A
518
394
0.51
52.82
0.60

3-62
2.00242
21.02
3.817
628
N/A
526
395
0.52
54.76
0.60

3-63
1.99474
20.78
3.787
616
N/A
520
393
0.53
57.59
0.50

3-64
1.99624
21.02
3.865
629
N/A
517
396
0.52
53.59
0.60

3-65
1.99462
21.17
3.907
637
N/A
516
395
0.51
52.62
0.60

3-66
1.90223
23.36
3.405
585
566
472
378
0.56
52.45
0.52

3-67
1.9023
23.44
3.459
589
564
469
377
0.55
51.52
0.51

3-68
1.90575
23.55
3.467
590
560
468
377
0.55
51.44
0.51

3-69
1.89824
23.79
3.498
589
549
462
376
0.54
48.86
0.53

3-70
1.89573
23.72
3.414
584
559
468
376
0.56
50.90
0.51

3-71
1.8959
23.61
3.399
586
569
472
377
0.56
50.49
0.55

3-72
1.89591
23.90
3.468
590
561
466
376
0.55
50.02
0.50

3-73
1.89598
23.79
3.452
588
555
465
376
0.55
49.61
0.53

3-74
1.90158
23.38
3.419
586
561
470
377
0.56
52.30
0.52

3-75
1.90054
23.36
3.382
586
561
468
377
0.56
52.87
0.52

3-76
1.90183
23.54
3.473
588
553
465
377
0.55
51.38
0.51

3-77
1.90052
23.54
3.436
587
551
464
376
0.55
51.90
0.51

3-78
1.89651
23.73
3.446
591
559
467
376
0.55
51.40
0.51

3-79
1.90232
23.46
3.456
581
564
471
377
0.55
51.81
0.51

3-80
1.90443
23.38
3.460
579
564
470
377
0.55
52.01
0.51

3-81
1.89848
23.60
3.433
586
554
468
377
0.55
51.69
0.50

3-82
1.89833
23.60
3.43
590
559
469
377
0.55
51.63
0.51

3-83
1.89847
23.69
3.437
590
548
466
376
0.55
51.61
0.50

3-84
1.89856
23.63
3.432
582
552
464
376
0.55
51.49
0.51

3-85
1.90048
23.64
3.438

571
475
377
0.55
51.83
0.51

3-86
1.89251
23.60
3.42

565
469
377
0.55
51.12
0.51

3-87
1.89666
23.51
3.438

558
467
377
0.55
51.60
0.51

3-88
1.90344
23.43
3.452

563
467
376
0.55
52.32
0.51

3-89
1.88811
23.77
3.379

575
466
375
0.56
51.42
0.51

3-90
1.88831
23.71
3.365

569
464
375
0.56
51.01
0.55

3-91
1.96914
22.11
3.89
657
639
500
388
0.51
49.36
0.58

3-92
2.01059
21.43
4.05
661
N/A
538
393
0.50
50.15
0.55

3-93
2.00864
21.62
4.05
670
N/A
511
391
0.50
49.66
0.55

3-94
2.02551
20.90
4.06
677
N/A
549
399
0.50
51.31
0.57

3-95
1.99093
21.75
4.01
688
N/A
514
391
0.50
49.04
0.55

TABLE 3-2(3)

Glass composition

Glass properties
(% by mass)

Specific
Tg
λ80
λ70
λ5
nd/Specific
TiO₂+
TiO₂/(TiO₂+

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
weight
Nb₂O₅
Nb₂O₅)

3-96
1.89542
23.34
3.396
580
557
467
377
0.5581331
52.27
0.52362732

3-97
1.8914
23.41
3.395
584
566
468
376
0.5571134
52
0.523461538

3-98
1.89093
23.44
3.384
581
566
468
376
0.55878546
51.99
0.523369879

3-99
1.89112
23.14
3.38
590
556
465
377
0.55950296
51.8
0.523552124

3-100
1.89951
23.23
3.38
583
551
468
378
0.56198521
52.12
0.556600153

3-101
1.89942
23.36
3.388
588
553
467
377
0.56063164
51.78
0.556778679

3-102
1.8865
23.56
3.356
582
549
465
376
0.56212753
52.14
0.523590334

3-103
1.88826
23.64
3.345
582
545
463
376
0.56450224
51.4
0.545525292

3-104
1.88811
23.75
3.361

546
464
376
0.56177031
51.83
0.511672776

3-105
1.89457
23.41
3.365

552
466
377
0.56302229
52.67
0.523447883

3-106
1.88953
23.5
3.351

544
465
377
0.56387049
52.4
0.523473282

3-107
1.89895
23.5
3.393

543
465
377
0.55966696
52.25
0.523444976

3-108
1.90024
23.75
3.376
588
558
469
378
0.5628673
51.81
0.556649296

3-109
1.90025
23.29
3.378
590
558
469
378
0.562537
51.83
0.556627436

3-110
1.90023
23.29
3.379

553
467
378
0.5623646
51.84
0.556712963

3-111
1.89992
23.3
3.377

552
465
377
0.56260586
51.84
0.556712963

3-112
1.89897
23.3
3.359
583
561
472
378
0.5653379
53.36
0.523425787

3-113
1.90618
22.84
3.361
583
566
475
379
0.56714668
54.45
0.534802571

3-114
1.90622
22.85
3.369
583
570
474
379
0.56581181
54.64
0.518850659

3-115
1.90606
22.92
3.376
582
609
475
378
0.56459123
54.84
0.503282276

3-116
1.89901
23.27
3.351
584
566
472
377
0.56669949
53.15
0.539981185

3-117
1.90185
22.87
3.351
586
595
479
379
0.567547
54.06
0.534961154

3-118
1.90097
22.89
3.347
587
670
486
380
0.56796235
54.07
0.534862216

3-119
1.90296
22.92
3.35
583
560
469
378
0.56804776
53.99
0.541211335

3-120
1.88883
23.63
3.372
585
556
466
377
0.56015125
51.5
0.523495146

3-121
1.8907
23.4
3.342
590
598
475
377
0.56573908
52.59
0.523483552

3-122
1.89048
23.4
3.345
583
561
471
377
0.56516592
52.81
0.52357508

3-123
1.89424
23.38
3.346
582
564
471
377
0.56612074
53.07
0.523459582

3-124
1.88593
23.54
3.332
584
552
466
377
0.5660054
52.54
0.523601066

3-125
1.88866
23.57
3.337
585
557
464
376
0.56597543
52.34
0.523500191

3-126
1.89279
23.57
3.353
581
559
468
377
0.56450641
52.75
0.511658768

3-127
1.89292
23.51
3.337
580
552
464
376
0.56725202
52.33
0.545576151

3-128
1.89479
23.47
3.356
590
556
469
377
0.56459774
52.63
0.52365571

3-129
1.89777
23.26
3.354
582
578
474
378
0.5658229
53.18
0.523505077

3-130
1.8924
23.68
3.361
585
550
466
377
0.56304671
51.21
0.545596563

3-131
1.89572
23.57
3.36
587
551
466
377
0.56420238
51.3
0.545614035

3-132
1.89843
23.24
3.354
581
546
454
372
0.56601968
53.52
0.523542601

3-133
1.88954
23.77
3.348
580
N/A
N/A
377
0.56437873
52.44
0.50553013

3-134
1.88958
23.73
3.343
582
N/A
668
376
0.56523482
52.22
0.522405209

TABLE 3-2(4)

Glass composition

Glass properties
(% by mass)

Specific
Tg
λ80
λ70
λ5
nd/Specific
TiO₂+
TiO₂/(TiO₂+

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)
weight
Nb₂O₅
Nb₂O₅)

3-135
1.88967
23.64
3.335
581
N/A
580
375
0.56661769
52.02
0.539792388

3-136
1.8876
23.54
3.326
582
N/A
546
374
0.56752856
51.8
0.557142857

3-137
1.89782
23.38
3.353
580
665
533
377
0.56600656
53.24
0.523666416

3-138
1.8959
23.39
3.353
583
N/A
556
377
0.56543394
53.1
0.52354049

3-139
1.89363
23.44
3.349
583
N/A
599
379
0.56543147
52.95
0.523512748

3-140
1.89767
23.49
3.364
584
N/A
628
379
0.56411118
52.87
0.523359183

3-141
1.89935
23.42
3.411
581
583
500
381
0.55683084
52.95
0.491406988

3-142
1.89904
23.53
3.43
584
578
490
378
0.55365598
53.33
0.46015376

3-143
1.89932
23.41
3.406
588
593
497
380
0.55763946
52.19
0.523471929

3-144
1.89937
23.62
3.426
587
580
500
381
0.55439872
51.8
0.523552124

3-145
1.90099
23.35
3.423
578
565
489
379
0.55535787
51.98
0.523470566

3-146
1.90325
23.32
3.426
588
591
500
381
0.55553123
51.64
0.523431448

3-147
1.90299
23.41
3.412
582
576
488
378
0.55773447
52.58
0.523583111

3-148
1.90284
23.41
3.437
583
570
490
379
0.55363398
52.16
0.523389571

3-149
1.90019
23.49
3.413
588
576
496
380
0.55675066
52.36
0.523491215

3-150
1.9003
23.51
3.433
586

0.55353918
51.96
0.5234796

3-151
1.90041
23.31
3.4
582
592
484
378
0.55894412
52.64
0.523556231

3-152
1.90055
23.31
3.4

591
483
378
0.55898529
52.65
0.525735992

3-153
1.9005
23.29
3.401
583
576
474
377
0.55880623
52.65
0.524786325

3-154
1.90049
23.29
3.4

572
473
377
0.55896765
52.63
0.525175755

3-155
1.89837
23.37
3.389
573
567
479
379
0.56015639
52.43
0.523555216

3-156
1.90132
23.29
3.4
582
569
483
379
0.55921176
52.75
0.523601896

3-157
1.89832
23.38
3.397
583
567
477
378
0.55882249
52.42
0.522319725

3-158
1.90151
23.25
3.402
583
558
473
378
0.55893886
52.75
0.525876777

3-159
2.01328
20.96
3.919
604
N/A
522
398
0.51372289
54.06
0.602848687

3-160
2.00332
20.96
3.88
612
N/A
525
397
0.51631959
52.98
0.658550396

3-161
2.00373
20.82
3.854
618
N/A
522
400
0.51990919
52.3
0.717399618

3-162
2.00319
21.01
3.89
619
N/A
517
396
0.51495887
53.3
0.630393996

3-163
2.00338
20.89
3.871
619
681
511
396
0.51753552
52.64
0.6875

3-164
2.00866
20.89
3.888
605
N/A
527
399
0.51663066
53.19
0.65858244

3-165
2.01517
20.82
3.894
609
N/A
527
400
0.51750642
53.42
0.658554848

3-166
2.01957
20.77
3.903
621
N/A
529
400
0.51744043
53.61
0.658645775

3-167
1.89886
23.64
3.456
584
609
502
380
0.54943866
51.19
0.50732565

3-168
1.89904
23.74
3.464
594
587
488
378
0.54822171
50.94
0.507263447

3-169
1.89897
23.78
3.505
593
573
484
378
0.54178887
50.23
0.507465658

3-170
1.89946
23.69
3.496
590
562
478
378
0.5433238
50.5
0.507326733

3-171
1.89862
24.01
3.542
598
564
481
378
0.53603049
48.91
0.507462687

3-172
1.89917
23.93
3.534
589
567
482
379
0.53739955
49.18
0.507320049

3-173
1.89987
23.81
3.529
589
559
479
378
0.53835931
49.47
0.507378209

3-174
1.88715
25.22
3.581
591
526
450
371
0.52698967
46.1
0.468980477

3-175
1.88787
24.93
3.536
592
537
454
372
0.53389989
44.78
0.576596695

3-176
1.88398
25.39
3.564
593
531
451
371
0.52861392
42.54
0.60390221

3-177
1.8839
25.13
3.604
596
531
450
371
0.52272475
43.01
0.592885375

3-178
1.88045
25.42
3.558
591
531
449
371
0.52851321
42.37
0.609629455

Example 3-2

A lens blank was prepared by using each of the optical glasses prepared in Example 3-1 in accordance with a known method, and various lenses were prepared by processing the lens blank in accordance with a known method such as polishing.

The prepared optical lens was various lenses such as a planar lens, a biconvex lens, a biconcave lens, a plano-convex lens, a plano-concave lens, a concave meniscus lens, and a convex meniscus lens.

A secondary chromatic aberration was capable of being excellently corrected by combining various lenses with a lens including another type of optical glass.

Example 3-3

Each of the optical glasses prepared in Example 3-1 was processed into the shape of a rectangular thin plate having Length of 50 mm×Width of 20 mm×Thickness of 1.0 mm to obtain a light guide plate. The light guide plate was built in the head mounted display 1 illustrated in FIG. 2.

Example 4
Example 4-1

Glass samples having glass compositions shown in Tables 4-1(1), 4-1(2), 4-1(3), 4-1(4), 4-2(1), 4-2(2), 4-2(3), and 4-2(4) were prepared by the following procedure, and various evaluations were performed.

[Manufacturing of Optical Glass]

First, an oxide, a hydroxide, a carbonate, and a nitrate corresponding to structural components of the glass were prepared as a raw material, the raw materials were weighed and blended such that a glass composition of optical glass to be obtained was each of the compositions shown in Tables 4-1(1), 4-1(2), 4-1(3), 4-1(4), 4-2(1), 4-2(2), 4-2(3), and 4-2(4), and the raw materials were sufficiently mixed. A blended raw material (a batch raw material) obtained as described above was put in a platinum crucible, and was heated at 1350° C. to 1400° C. for 2 hours to be molten glass, and the molten glass was stirred, homogenized, and clarified, and then, was cast into a mold that was preheated to a suitable temperature. The cast glass was subjected to a heat treatment at approximately a glass transition temperature Tg for 30 minutes, and was allowed to cool in a furnace to a room temperature, and thus, a glass sample was obtained.

[Check of Glass Component Composition]

[Measurement of Optical Properties]

The obtained glass sample was further subjected to an annealing treatment at approximately the glass transition temperature Tg for approximately 30 minutes to 2 hours, and then, was cooled in the furnace to the room temperature at a temperature decrease rate of −30° C./hour, and thus, an annealed sample was obtained. In the obtained annealed sample, refractive indices nd, ng, nF, and nC, an Abbe's number νd, a specific weight, the glass transition temperature Tg, λ80, λ70, and λ5 were measured. Results are shown in Tables 4-3(1), 4-3(2), 4-3(3), and 4-3(4).

(i) Refractive Indices nd, ng, nF, and nC and Abbe's Number νd

νd=(nd−1)/(nF−nC)

(ii) Specific Weight

The specific weight was measured by an Archimedes method.

(iii) Glass Transition Temperature Tg

(iv) λ80, λ70, and λ5

TABLE 4-1(1)

% by mass

No.
P₂O₅
SiO₂
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
MgO
CaO
SrO
BaO

4-1
0.00
21.48
1.02
0.00
3.09
2.49
0.00
0.00
9.41
0.00
10.78

4-2
0.00
21.29
1.01
0.00
2.21
4.23
0.00
0.00
9.33
0.00
10.68

4-3
0.00
21.17
1.00
0.00
2.20
2.45
0.00
2.28
9.28
0.00
10.63

4-4
0.00
20.99
0.99
0.00
2.18
2.43
0.00
0.00
12.34
0.00
10.53

4-5
0.00
24.07
2.26
0.00
4.43
2.79
0.00
0.00
10.55
0.00
2.22

4-6
0.00
24.23
1.15
0.00
4.94
2.81
0.00
0.00
10.61
0.00
2.24

4-7
0.00
23.74
1.12
0.00
4.61
2.75
0.00
0.00
10.40
0.00
2.19

4-8
0.00
23.68
1.12
0.00
4.35
3.24
0.00
0.00
10.38
0.00
2.19

4-9
0.00
23.65
1.12
0.00
4.35
2.74
0.00
0.65
10.36
0.00
2.18

4-10
0.00
23.59
1.12
0.00
4.34
2.73
0.00
0.00
11.23
0.00
2.18

4-11
0.00
24.22
1.15
0.00
4.92
2.80
0.00
0.00
10.61
0.00
0.00

4-12
0.00
24.11
1.14
0.00
4.68
2.79
0.68
0.00
10.56
0.00
0.00

4-13
0.00
26.33
1.15
0.00
4.95
2.82
0.00
0.00
10.68
0.00
0.00

4-14
0.00
24.58
2.31
0.00
4.99
2.85
0.00
0.00
10.77
0.00
0.00

4-15
0.00
26.80
1.17
0.00
5.04
2.87
0.00
0.00
10.87
0.00
0.00

4-16
0.00
25.02
2.35
0.00
5.08
2.90
0.00
0.00
10.96
0.00
0.00

4-17
0.00
28.98
1.18
0.00
5.07
2.89
0.00
0.00
10.94
0.00
0.00

4-18
0.00
27.06
1.18
1.71
5.08
2.90
0.00
0.00
10.97
0.00
0.00

4-19
0.00
27.39
1.20
0.00
5.65
2.94
0.00
0.00
11.11
0.00
0.00

4-20
0.00
27.01
1.18
0.00
5.08
2.90
0.00
0.00
12.83
0.00
0.00

4-21
0.00
27.24
1.19
0.00
5.12
3.96
0.00
0.00
11.05
0.00
0.00

4-22
0.00
29.50
1.20
0.00
5.16
2.94
0.00
0.00
11.14
0.00
0.00

4-23
0.00
29.38
1.20
0.00
5.64
2.93
0.00
0.00
9.20
0.00
0.00

4-24
0.00
29.34
1.20
0.00
4.63
3.97
0.00
0.00
11.08
0.00
0.00

4-25
0.00
30.04
1.22
0.00
5.26
3.00
0.00
0.00
11.34
0.00
0.00

4-26
0.00
22.31
1.15
0.00
4.92
2.81
0.00
0.00
12.44
0.00
0.00

4-27
0.00
23.90
1.13
0.00
4.38
2.77
0.00
0.00
12.26
0.00
0.00

4-28
0.00
23.59
1.12
0.00
3.85
2.73
0.00
0.00
13.87
0.00
0.00

4-29
0.00
24.74
1.17
0.00
5.52
2.86
0.00
0.00
10.84
0.00
0.00

4-30
0.00
23.73
1.12
0.00
3.87
2.75
2.99
0.00
10.40
0.00
0.00

4-31
0.00
22.49
1.16
0.00
4.96
3.84
0.00
0.00
10.71
0.00
0.00

4-32
0.00
24.42
1.16
0.00
4.96
3.84
0.00
0.00
8.87
0.00
0.00

4-33
0.00
25.96
1.14
0.00
4.64
2.78
0.00
0.00
10.53
1.66
0.00

4-34
0.00
25.75
1.13
0.00
4.60
2.76
0.00
0.00
10.45
0.00
2.44

4-35
0.00
25.88
1.13
0.00
4.62
2.77
0.00
0.00
10.50
0.00
0.00

4-36
0.00
25.89
1.13
0.00
4.86
2.77
0.00
0.00
10.50
0.00
0.00

4-37
0.00
25.84
1.13
0.00
3.87
3.21
2.44
0.00
10.48
0.00
0.00

4-38
0.00
25.62
1.12
0.00
3.07
4.78
2.42
0.00
10.39
0.00
0.00

4-39
0.00
25.41
1.11
0.00
2.28
6.31
2.40
0.00
10.31
0.00
0.00

4-40
0.00
25.21
1.10
0.00
1.51
7.83
2.38
0.00
10.22
0.00
0.00

4-41
0.00
26.05
1.14
0.00
4.68
1.62
2.46
0.00
10.57
0.00
0.00

4-42
0.00
26.27
1.15
0.00
5.51
0.00
2.48
0.00
10.66
0.00
0.00

4-43
1.15
26.16
1.14
0.00
4.43
2.81
0.00
0.00
10.61
0.00
0.00

4-44
0.00
26.18
1.15
0.83
4.68
2.81
0.00
0.00
10.62
0.00
0.00

4-45
0.00
25.86
1.13
0.00
4.62
2.77
0.00
0.00
10.49
0.83
1.23

4-46
0.00
25.20
1.10
0.00
4.27
2.70
0.00
0.00
10.22
0.00
4.78

4-47
0.00
24.67
1.08
0.00
3.95
2.64
0.00
0.00
10.00
0.00
7.01

4-48
0.00
26.27
1.13
0.00
4.61
2.77
0.00
0.00
10.46
0.00
2.45

4-49
0.00
26.39
1.13
0.00
4.63
2.78
0.00
0.00
10.51
0.00
2.46

4-50
0.00
25.87
1.13
0.00
4.67
2.77
0.00
0.00
10.49
0.00
1.96

4-51
0.00
25.62
1.12
0.00
4.34
2.75
0.75
0.00
10.39
0.00
2.43

4-52
0.00
25.69
1.12
0.00
4.59
2.26
0.75
0.00
10.42
0.00
2.43

4-53
0.28
25.76
1.12
0.00
4.60
2.76
0.00
0.00
10.45
0.00
2.14

4-54
0.00
18.82
0.89
0.00
1.62
0.00
0.00
0.00
8.25
2.32
17.16

4-55
0.00
26.40
1.13
0.00
4.63
2.78
0.00
0.00
10.51
0.00
0.00

4-56
0.00
26.51
1.14
0.00
4.65
2.79
0.00
0.00
10.56
0.00
0.00

4-57
0.00
25.75
1.13
0.00
4.84
1.77
0.75
0.00
10.45
0.00
2.44

4-58
0.00
25.62
1.12
0.00
4.58
1.76
1.49
0.00
10.39
0.00
2.43

4-59
0.00
26.60
0.57
0.00
4.58
2.75
0.00
0.00
10.40
0.00
2.43

4-60
0.00
24.90
1.69
0.00
4.62
2.77
0.00
0.00
10.49
0.00
2.45

4-61
0.00
25.84
0.58
0.00
4.86
2.77
0.00
0.00
10.48
0.00
2.45

4-62
0.00
25.67
0.57
0.00
4.59
2.75
0.00
0.00
11.30
0.00
2.43

4-63
0.00
25.14
1.10
0.00
4.26
2.21
0.73
0.00
10.19
0.00
4.77

4-64
0.00
25.80
1.13
0.00
4.61
2.27
0.75
0.00
10.46
0.00
2.45

4-65
0.00
16.53
0.93
0.00
2.05
2.28
0.00
0.00
8.63
0.00
17.95

4-66
0.00
19.40
0.92
0.00
2.02
0.64
0.00
0.00
8.50
0.00
17.68

4-67
0.00
20.71
0.98
0.00
2.15
2.40
0.00
0.00
9.07
0.00
10.39

4-68
0.00
16.12
0.91
0.00
2.00
0.63
0.00
0.00
8.41
0.00
17.50

4-69
0.00
16.71
0.94
0.00
2.47
0.66
0.00
0.00
8.72
0.00
14.07

4-70
0.00
16.71
0.94
0.00
2.07
2.31
0.00
0.00
8.72
0.00
9.99

4-71
0.00
16.35
0.92
0.00
2.22
0.64
0.00
0.00
8.53
0.00
17.75

4-72
0.00
16.06
0.90
0.00
1.99
0.63
0.00
0.00
8.38
0.00
19.42

4-73
0.00
25.76
1.13
0.00
4.60
2.27
0.75
0.00
10.45
0.00
0.00

4-74
0.00
25.10
1.10
0.00
4.25
2.21
0.73
0.00
10.18
0.00
2.38

4-75
0.00
25.06
1.10
0.00
4.25
2.21
0.73
0.00
10.16
0.00
0.00

4-76
0.00
24.80
1.09
0.00
4.20
2.18
0.72
0.00
10.06
0.00
4.70

4-77
0.00
25.62
1.12
0.00
4.58
2.26
0.75
0.00
10.39
0.00
2.43

4-78
0.00
25.84
1.13
0.00
4.62
2.27
0.75
0.00
10.48
0.00
2.45

4-79
0.00
24.97
1.09
0.00
4.23
2.20
0.73
0.00
10.13
0.00
4.73

4-80
0.00
25.17
1.10
0.00
4.27
2.22
0.73
0.00
10.21
0.00
4.77

4-81
0.00
25.68
1.12
0.00
4.59
2.26
0.75
0.00
10.42
0.00
0.00

4-82
0.00
25.96
1.14
0.00
4.64
2.29
0.76
0.00
10.53
0.00
0.00

4-83
0.00
25.03
1.10
0.00
4.24
2.20
0.73
0.00
10.15
0.00
2.37

4-84
0.00
25.30
1.11
0.00
4.29
2.23
0.74
0.00
10.26
0.00
2.40

4-85
0.00
25.97
0.56
0.00
4.24
2.20
0.73
0.00
10.15
0.00
4.75

4-86
0.00
24.30
1.65
0.00
4.28
2.22
0.73
0.00
10.23
0.00
4.78

4-87
0.00
23.45
2.20
0.00
4.29
2.23
0.74
0.00
10.28
0.00
4.80

4-88
0.00
25.50
1.11
0.00
4.29
2.23
0.74
0.00
10.27
0.00
2.40

4-89
0.00
25.54
1.11
0.00
4.30
2.23
0.74
0.00
10.28
0.00
2.40

4-90
0.00
25.32
1.11
0.00
4.29
2.23
0.74
0.00
10.53
0.00
2.40

4-91
0.00
25.39
1.11
0.00
4.30
2.23
0.74
0.00
10.56
0.00
2.41

4-92
0.00
25.32
1.11
0.00
4.36
2.23
0.74
0.00
10.27
0.00
3.12

4-93
0.00
26.82
1.09
0.00
3.84
2.20
0.73
0.00
10.12
0.00
3.08

4-94
0.00
25.19
1.10
0.00
3.87
3.18
0.73
0.00
10.22
0.00
3.10

4-95
0.00
23.65
1.12
0.00
4.40
3.23
0.74
0.00
10.36
0.00
3.15

4-96
0.00
26.84
1.13
0.00
4.62
2.28
0.75
0.00
10.50
0.00
2.45

4-97
0.00
27.07
1.14
0.00
4.66
2.30
0.76
0.00
10.59
0.00
2.47

4-98
0
25.67
1.12
0
4.11
3.24
0.75
0
10.41
0
2.43

4-99
0
25.54
1.12
0
3.62
4.2
0.74
0
10.36
0
2.42

4-100
0
25.54
1.12
0
4.09
2.25
2.23
0
10.36
0
2.42

4-101
0
27.32
1.11
0
4.07
2.24
0.74
0
10.31
0
2.41

4-102
0
26.02
1.14
0
4.65
2.29
0.76
0
10.55
0
2.47

4-103
0
25.85
1.13
0
4.38
2.28
0.75
0
11.38
0
2.45

4-104
0
25.6
1.12
0
3.87
2.25
2.98
0
10.83
0
1.21

4-105
0
27.28
1.15
0
4.7
2.32
0.77
0
11.13
0
1.25

4-106
0
27.04
1.14
0
4.66
2.3
0.76
0
11.03
0
1.24

4-107
0
25.86
1.13
0
4.62
1.29
2.26
0
10.94
0
1.23

4-108
0
25.73
1.13
0
4.6
0.29
3.75
0
10.88
0
1.22

4-109
0
25.66
1.12
0
4.11
2.26
0.75
0
12.63
0
1.22

4-110
0
26.1
1.13
0
4.32
2.28
0.75
0
11.39
0
1.23

4-111
0
25.88
1.13
0
4.27
2.53
0.75
0
11.39
0
1.23

4-112
0
25.88
1.13
0
4.32
2.28
0.94
0
11.39
0
1.23

4-113
0
25.88
1.13
0
4.38
2.03
1.13
0
11.39
0
1.23

4-114
0
26.2
1.15
0
4.68
2.31
0.76
0
11.54
0
0

4-115
0
26.1
1.14
0
4.66
2.3
0.76
0
10.59
0
0

4-116
0
25.99
1.14
0
4.64
2.29
0.76
0
10.54
0
0

4-117
0
25.88
1.13
0
4.62
2.28
0.75
0
10.5
0
0

4-118
0
26.32
1.15
0
4.7
2.32
0.77
0
11.59
0
0

4-119
0
26.88
1.13
0
4.39
2.28
0.75
0
10.51
0
0

4-120
0
27.37
1.13
0
4.63
1.54
0.75
0
10.51
0
0

4-121
0
26.49
1.15
0
4.68
2.31
0.76
0
10.62
0
0

4-122
0
27.24
1.11
0
4.52
2.23
0.74
0
10.26
0
2.4

4-123
0
28.66
1.09
0
4.43
2.18
0.72
0
10.06
0
2.35

4-124
0
27.75
1.13
0
4.14
2.27
0.75
0
11.37
0
0

4-125
0
25.93
1.14
0
4.15
2.28
2.27
0
11.42
0
0

4-126
0
26.07
1.14
0
4.66
1.3
2.28
0
11.48
0
0

4-127
0
25.8
1.13
0
4.13
1.28
3.76
0
11.36
0
0

4-128
0
27.61
1.13
0
4.59
2.26
0.75
0
11.32
0
0

4-129
0
26.55
1.16
0
4.74
2.34
0.77
0
11.69
0
0

4-130
0
26.78
1.17
0
4.79
2.36
0.78
0
11.79
0
0

4-131
0
26.81
1.13
0
4.14
2.27
0.75
0
12.27
0
0

4-132
0
26.12
1.71
0
4.43
2.3
0.76
0
11.5
0
0

4-133
0
26.2
1.71
0
4.44
2.31
0.76
0
11.54
0
0

4-134
0
26.24
1.15
0
4.69
2.31
0.76
0
11.55
0
0

4-135
0
25.99
1.6
0
4.7
2.31
0.77
0
11.11
0
0

4-136
0
26.72
1.17
0
4.78
2.35
0.78
0
11.76
0
0

4-137
0
26.84
1.18
0
4.8
2.36
0.78
0
11.82
0
0

4-138
0
26.96
1.18
0
4.82
2.37
0.78
0
11.87
0
0

4-139
0
27.08
1.19
0
4.84
2.38
0.79
0
11.92
0
0

4-140
0
26.14
1.14
0
4.91
2.3
0.76
0
11.51
0
0

4-141
0
26.07
1.14
0
4.66
2.79
0.76
0
11.48
0
0

4-142
0
26.01
1.14
0
4.65
2.29
1.51
0
11.45
0
0

4-143
0
25.97
1.14
0
4.64
2.29
0.76
0
12.33
0
0

4-144
0
25.58
1.12
0
4.57
2.25
0.74
0
10.37
0
2.42

4-145
0
25.37
1.11
0
4.53
2.23
0.74
0
10.29
0
2.4

4-146
0
25.63
1.12
0
4.34
2.26
0.75
0
11.28
0
2.43

4-147
0
25.44
1.11
0
4.31
2.24
0.74
0
10.32
1.63
2.41

4-148
0
25.53
1.12
0
4.33
2.25
0.74
0
10.35
0
2.42

4-149
0
25.36
1.11
0
4.3
2.23
0.74
0
10.29
0
2.4

4-150
0
24.85
1.13
0
4.61
2.27
0.75
0
11.36
0
2.45

4-151
0
24.67
1.12
0
4.58
2.26
0.75
0
10.39
1.64
2.43

4-152
0
25.71
0.57
0
4.59
2.26
0.75
0
11.32
0
2.44

4-153
0
25.52
0.57
0
4.56
2.25
0.74
0
10.35
1.63
2.42

4-154
0
25.65
1.13
0
4.62
2.28
0.75
0
10.48
0
2.45

4-155
0
25.72
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44

4-156
0
25.69
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44

4-157
0
25.76
1.13
0
4.57
2.27
0.75
0
10.45
0
2.44

4-158
0
25.94
1.13
0
4.6
2.27
0.75
0
10.44
0
2.44

4-159
0
25.51
1.13
0
4.63
2.28
0.75
0
10.5
0
2.45

4-160
0
25.9
1.13
0
4.61
2.27
0.75
0
10.47
0
2.45

4-161
0
25.59
1.13
0
4.61
2.27
0.75
0
10.46
0
2.44

4-162
0
13.35
0.93
0
2.83
0.65
0
0
8.61
0
17.92

4-163
0
13.42
0.93
0
2.06
2.29
0
0
8.66
0
18.01

4-164
0
13.61
0.95
0
2.09
2.32
0
0
8.78
0
18.27

4-165
0
13.33
0.93
0
2.04
2.27
0
0
8.6
0
17.89

4-166
0
13.52
0.94
0
2.07
2.3
0
0
8.72
0
18.14

4-167
0
13.48
0.94
0
2.46
1.48
0
0
8.7
0
18.09

4-168
0
13.54
0.94
0
2.87
0.66
0
0
8.73
0
18.17

4-169
0
13.58
0.95
0
3.2
0
0
0
8.76
0
18.23

4-170
0
24.94
1.09
0
3.77
2.2
0.73
1.24
10.11
0
4.73

4-171
0
24.82
1.09
0
3.75
2.18
0.72
0
11.79
0
4.71

4-172
0
24.46
1.07
0
3.69
2.15
0.71
0
9.92
3.13
4.64

4-173
0
24.61
1.08
0
3.94
2.17
0.72
0
9.98
0
7

4-174
0
23.82
1.04
0
3.16
2.1
0.69
0
9.66
6.1
4.52

4-175
0
23.96
1.05
0
3.4
2.11
0.7
0
9.72
3.07
6.81

4-176
0
24.1
1.06
0
3.64
2.12
0.7
0
9.77
0
9.14

No.
TiO₂
Nb₂O₅
ZrO₂
ZnO
Ta₂O₅
Gd₂O₃
La₂O₃
Y₂O₃
Total
Sb₂O₃

4-1
26.46
23.47
1.80
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-2
26.21
23.26
1.78
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-3
26.09
23.13
1.77
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-4
25.85
22.93
1.76
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-5
29.63
22.03
2.02
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-6
29.82
22.17
2.03
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-7
29.25
25.94
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-8
29.17
25.87
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-9
29.12
25.83
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-10
29.04
25.77
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-11
29.84
26.46
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-12
29.70
26.34
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-13
27.44
26.63
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-14
27.64
26.86
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-15
30.55
22.70
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-16
30.80
22.89
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-17
28.09
22.85
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-18
28.18
22.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-19
28.51
23.20
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-20
28.12
22.88
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-21
28.37
23.07
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-22
31.31
18.75
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-23
28.48
23.17
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-24
31.13
18.65
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-25
34.64
14.50
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-26
29.87
26.50
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-27
29.44
26.12
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-28
29.06
25.78
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-29
27.84
27.03
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-30
29.22
25.92
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-31
30.13
26.71
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-32
30.07
26.68
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-33
27.03
26.26
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-34
26.82
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-35
26.96
26.17
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-36
24.41
30.44
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-37
26.90
26.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-38
26.69
25.91
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-39
26.48
25.70
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-40
26.26
25.49
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-41
27.13
26.35
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-42
27.36
26.57
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-43
27.25
26.45
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-44
27.25
26.48
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-45
26.92
26.15
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-46
26.24
25.49
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-47
25.70
24.95
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-48
26.22
26.09
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-49
26.97
25.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-50
26.95
26.16
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-51
26.69
25.91
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-52
26.76
25.98
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-53
26.84
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-54
28.80
20.56
1.58
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-55
26.35
26.21
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-56
27.11
25.26
1.98
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-57
26.82
26.05
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-58
26.68
25.91
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-59
26.71
25.94
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-60
26.93
26.15
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-61
26.91
26.13
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-62
26.73
25.96
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-63
26.18
25.42
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-64
27.50
25.03
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-65
28.46
21.52
1.65
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-66
28.03
21.19
1.62
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-67
29.93
22.63
1.73
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-68
31.84
20.98
1.61
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-69
33.01
21.75
1.67
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-70
28.77
28.82
1.67
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-71
32.30
21.28
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-72
31.72
20.90
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-73
27.46
24.99
0.00
0.00
0.00
0.00
2.59
0.00
100.00
0.03

4-74
26.14
25.38
0.00
0.00
0.00
0.00
2.53
0.00
100.00
0.03

4-75
26.10
25.35
0.00
0.00
0.00
0.00
5.05
0.00
100.00
0.03

4-76
25.82
23.04
0.00
0.00
3.39
0.00
0.00
0.00
100.00
0.03

4-77
26.05
24.86
1.95
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-78
27.55
22.95
1.97
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-79
24.77
25.25
1.90
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-80
26.22
23.39
1.92
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-81
27.38
24.92
0.00
0.00
0.00
2.88
0.00
0.00
100.00
0.03

4-82
27.68
25.19
0.00
0.00
0.00
0.00
0.00
1.81
100.00
0.03

4-83
26.06
25.31
0.00
0.00
0.00
2.80
0.00
0.00
100.00
0.03

4-84
26.34
25.58
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

4-85
26.08
25.32
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-86
26.28
25.52
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-87
26.38
25.62
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-88
26.11
25.60
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

4-89
26.40
25.22
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

4-90
26.00
25.61
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

4-91
26.44
25.05
0.00
0.00
0.00
0.00
0.00
1.77
100.00
0.03

4-92
26.55
25.29
0.00
0.00
0.00
0.00
1.02
0.00
100.00
0.03

4-93
26.18
24.94
0.00
0.00
0.00
0.00
1.01
0.00
100.00
0.03

4-94
26.42
25.17
0.00
0.00
0.00
0.00
1.01
0.00
100.00
0.03

4-95
26.80
25.52
0.00
0.00
0.00
0.00
1.03
0.00
100.00
0.03

4-96
26.31
25.11
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-97
27.83
23.18
0.00
0.00
0.00
0.00
0.00
0.00
100.00
0.03

4-98
27.37
24.9
0
0
0
0
0
0
100
0.03

4-99
27.22
24.78
0
0
0
0
0
0
100
0.03

4-100
27.21
24.78
0
0
0
0
0
0
100
0.03

4-101
27.12
24.68
0
0
0
0
0
0
100
0.03

4-102
29.01
23.11
0
0
0
0
0
0
100
0.03

4-103
28.83
22.95
0
0
0
0
0
0
100
0.03

4-104
27.3
24.84
0
0
0
0
0
0
100
0.03

4-105
28.04
23.36
0
0
0
0
0
0
100
0.03

4-106
26.52
25.31
0
0
0
0
0
0
100
0.03

4-107
27.57
25.1
0
0
0
0
0
0
100
0.03

4-108
27.43
24.97
0
0
0
0
0
0
100
0.03

4-109
27.35
24.9
0
0
0
0
0
0
100
0.03

4-110
28.84
22.97
0.99
0
0
0
0
0
100
0.03

4-111
28.85
22.98
0.99
0
0
0
0
0
100
0.03

4-112
28.86
22.98
0.99
0
0
0
0
0
100
0.03

4-113
28.86
22.98
0.99
0
0
0
0
0
100
0.03

4-114
27.93
25.43
0
0
0
0
0
0
100
0.03

4-115
29.12
25.33
0
0
0
0
0
0
100
0.03

4-116
28.35
26.29
0
0
0
0
0
0
100
0.03

4-117
27.6
27.24
0
0
0
0
0
0
100
0.03

4-118
28.7
24.45
0
0
0
0
0
0
100
0.03

4-119
28.92
25.14
0
0
0
0
0
0
100
0.03

4-120
28.92
25.15
0
0
0
0
0
0
100
0.03

4-121
29.22
24.77
0
0
0
0
0
0
100
0.03

4-122
26.96
24.54
0
0
0
0
0
0
100
0.03

4-123
26.44
24.07
0
0
0
0
0
0
100
0.03

4-124
27.53
25.06
0
0
0
0
0
0
100
0.03

4-125
27.65
25.16
0
0
0
0
0
0
100
0.03

4-126
27.78
25.29
0
0
0
0
0
0
100
0.03

4-127
27.51
25.03
0
0
0
0
0
0
100
0.03

4-128
27.4
24.94
0
0
0
0
0
0
100
0.03

4-129
26.99
25.76
0
0
0
0
0
0
100
0.03

4-130
28.55
23.78
0
0
0
0
0
0
100
0.03

4-131
27.56
25.07
0
0
0
0
0
0
100
0.03

4-132
27.84
25.34
0
0
0
0
0
0
100
0.03

4-133
27.94
23.27
0
0
0
0
0
1.83
100
0.03

4-134
27.99
23.31
2
0
0
0
0
0
100
0.03

4-135
28.02
25.5
0
0
0
0
0
0
100
0

4-136
26.51
25.93
0
0
0
0
0
0
100
0

4-137
27.28
24.94
0
0
0
0
0
0
100
0

4-138
28.08
23.94
0
0
0
0
0
0
100
0

4-139
28.86
22.94
0
0
0
0
0
0
100
0

4-140
27.88
25.36
0
0
0
0
0
0
100
0

4-141
27.8
25.3
0
0
0
0
0
0
100
0

4-142
27.72
25.23
0
0
0
0
0
0
100
0

4-143
27.67
25.2
0
0
0
0
0
0
100
0

4-144
26.02
26.93
0
0
0
0
0
0
100
0.03

4-145
24.54
28.79
0
0
0
0
0
0
100
0.03

4-146
27.32
24.87
0
0
0
0
0
0
100
0.03

4-147
27.12
24.68
0
0
0
0
0
0
100
0.03

4-148
27.21
24.77
0
1.28
0
0
0
0
100
0.03

4-149
27.03
24.61
1.93
0
0
0
0
0
100
0.03

4-150
27.53
25.05
0
0
0
0
0
0
100
0.03

4-151
27.3
24.86
0
0
0
0
0
0
100
0.03

4-152
27.41
24.95
0
0
0
0
0
0
100
0.03

4-153
27.2
24.76
0
0
0
0
0
0
100
0.03

4-154
27.56
25.08
0
0
0
0
0
0
100
0.03

4-155
27.68
24.97
0
0
0
0
0
0
100
0.03

4-156
27.63
25.02
0
0
0
0
0
0
100
0.03

4-157
27.64
24.99
0
0
0
0
0
0
100
0.03

4-158
27.45
24.98
0
0
0
0
0
0
100
0.03

4-159
27.62
25.13
0
0
0
0
0
0
100
0.03

4-160
27.38
25.04
0
0
0
0
0
0
100
0.03

4-161
27.74
25.01
0
0
0
0
0
0
100
0.03

4-162
32.59
21.47
1.65
0
0
0
0
0
100
0.03

4-163
34.89
18.09
1.65
0
0
0
0
0
100
0.03

4-164
37.52
14.78
1.68
0
0
0
0
0
100
0.03

4-165
33.6
19.7
1.64
0
0
0
0
0
100
0.03

4-166
36.19
16.45
1.67
0
0
0
0
0
100
0.03

4-167
35.03
18.16
1.66
0
0
0
0
0
100
0.03

4-168
35.18
18.24
1.67
0
0
0
0
0
100
0.03

4-169
35.31
18.3
1.67
0
0
0
0
0
100
0.03

4-170
25.97
25.22
0
0
0
0
0
0
100
0.03

4-171
25.84
25.1
0
0
0
0
0
0
100
0.03

4-172
25.49
24.74
0
0
0
0
0
0
100
0.03

4-173
25.62
24.88
0
0
0
0
0
0
100
0.03

4-174
24.82
24.09
0
0
0
0
0
0
100
0.03

4-175
24.95
24.23
0
0
0
0
0
0
100
0.03

4-176
25.1
24.37
0
0
0
0
0
0
100
0.03

TABLE 4-2(1)

% by mass

TiO₂/(TiO₂+

Nb₂O₅+

WO₃+ ZrO₂+

SrO +

BaO +
Li₂O/

Li₂O +

Li₂O/{100 −

ZnO +
(Li₂O +

Na₂O +
Na₂O +
Gd₂O₃+
(SiO₂+

TiO₂/
La₂O₃+
Na₂O +

K₂O +
K₂O +
La₂O₃+
B₂O₃+
TiO₂+
(TiO₂+
Gd₂O₃+ Y₂O₃+
K₂O +

No.
Cs₂O
Cs₂O
Y₂O₃
P₂O₅+ GeO₂)}
Nb₂O₅
Nb₂O₅)
Ta₂O₅+ Bi₂O₃)
Cs₂O)

4-1
5.58
2.49
0.00
0.04
49.93
0.53
0.42
0.55

4-2
6.44
4.23
0.00
0.03
49.47
0.53
0.42
0.34

4-3
4.65
2.45
0.00
0.03
49.22
0.53
0.42
0.47

4-4
4.61
2.43
0.00
0.03
48.78
0.53
0.42
0.47

4-5
7.22
2.79
0.00
0.06
51.66
0.57
0.53
0.61

4-6
7.75
2.81
0.00
0.07
51.99
0.57
0.53
0.64

4-7
7.36
2.75
0.00
0.06
55.19
0.53
0.51
0.63

4-8
7.59
3.24
0.00
0.06
55.04
0.53
0.51
0.57

4-9
7.09
2.74
0.00
0.06
54.95
0.53
0.51
0.61

4-10
7.07
2.73
0.00
0.06
54.81
0.53
0.51
0.61

4-11
7.72
2.80
0.00
0.07
56.30
0.53
0.53
0.64

4-12
8.15
3.47
0.00
0.06
56.04
0.53
0.53
0.57

4-13
7.77
2.82
0.00
0.07
54.07
0.51
0.51
0.64

4-14
7.84
2.85
0.00
0.07
54.50
0.51
0.51
0.64

4-15
7.91
2.87
0.00
0.07
53.25
0.57
0.57
0.64

4-16
7.98
2.90
0.00
0.07
53.69
0.57
0.57
0.64

4-17
7.96
2.89
0.00
0.07
50.94
0.55
0.55
0.64

4-18
7.98
2.90
0.00
0.07
51.10
0.55
0.55
0.64

4-19
8.59
2.94
0.00
0.08
51.71
0.55
0.55
0.66

4-20
7.98
2.90
0.00
0.07
51.00
0.55
0.55
0.64

4-21
9.08
3.96
0.00
0.07
51.44
0.55
0.55
0.56

4-22
8.10
2.94
0.00
0.07
50.06
0.63
0.63
0.64

4-23
8.57
2.93
0.00
0.08
51.65
0.55
0.55
0.66

4-24
8.60
3.97
0.00
0.07
49.78
0.63
0.63
0.54

4-25
8.26
3.00
0.00
0.08
49.14
0.70
0.70
0.64

4-26
7.73
2.81
0.00
0.06
56.37
0.53
0.53
0.64

4-27
7.15
2.77
0.00
0.06
55.56
0.53
0.53
0.61

4-28
6.58
2.73
0.00
0.05
54.84
0.53
0.53
0.59

4-29
8.38
2.86
0.00
0.07
54.87
0.51
0.51
0.66

4-30
9.61
5.74
0.00
0.05
55.14
0.53
0.53
0.40

4-31
8.80
3.84
0.00
0.06
56.84
0.53
0.53
0.56

4-32
8.80
3.84
0.00
0.07
56.75
0.53
0.53
0.56

4-33
7.42
2.78
0.00
0.06
53.29
0.51
0.49
0.63

4-34
7.36
2.76
0.00
0.06
52.87
0.51
0.48
0.63

4-35
7.39
2.77
0.00
0.06
53.13
0.51
0.49
0.63

4-36
7.63
2.77
0.00
0.07
54.85
0.45
0.45
0.64

4-37
9.52
5.65
0.00
0.05
53.03
0.51
0.51
0.41

4-38
10.27
7.20
0.00
0.04
52.60
0.51
0.51
0.30

4-39
10.99
8.71
0.00
0.03
52.18
0.51
0.51
0.21

4-40
11.72
10.21
0.00
0.02
51.75
0.51
0.51
0.13

4-41
8.76
4.08
0.00
0.06
53.48
0.51
0.51
0.53

4-42
7.99
2.48
0.00
0.08
53.93
0.51
0.51
0.69

4-43
7.24
2.81
0.00
0.06
53.70
0.51
0.51
0.61

4-44
7.49
2.81
0.00
0.06
53.73
0.51
0.51
0.62

4-45
7.39
2.77
0.00
0.06
53.07
0.51
0.49
0.63

4-46
6.97
2.70
0.00
0.06
51.73
0.51
0.46
0.61

4-47
6.59
2.64
0.00
0.05
50.65
0.51
0.45
0.60

4-48
7.38
2.77
0.00
0.06
52.31
0.50
0.48
0.62

4-49
7.41
2.78
0.00
0.06
52.10
0.52
0.49
0.62

4-50
7.44
2.77
0.00
0.06
53.11
0.51
0.49
0.63

4-51
7.84
3.50
0.00
0.06
52.60
0.51
0.49
0.55

4-52
7.60
3.01
0.00
0.06
52.74
0.51
0.49
0.60

4-53
7.36
2.76
0.00
0.06
52.89
0.51
0.49
0.63

4-54
1.62
0.00
0.00
0.02
49.36
0.58
0.41
1.00

4-55
7.41
2.78
0.00
0.06
52.57
0.50
0.48
0.63

4-56
7.44
2.79
0.00
0.06
52.37
0.52
0.50
0.63

4-57
7.36
2.52
0.00
0.07
52.87
0.51
0.48
0.66

4-58
7.84
3.26
0.00
0.06
52.60
0.51
0.48
0.58

4-59
7.33
2.75
0.00
0.06
52.66
0.51
0.48
0.63

4-60
7.39
2.77
0.00
0.06
53.08
0.51
0.48
0.63

4-61
7.62
2.77
0.00
0.07
53.04
0.51
0.48
0.64

4-62
7.34
2.75
0.00
0.06
52.69
0.51
0.48
0.63

4-63
7.20
2.94
0.00
0.06
51.60
0.51
0.46
0.59

4-64
7.63
3.02
0.00
0.06
52.53
0.52
0.50
0.60

4-65
4.33
2.28
0.00
0.02
49.98
0.57
0.41
0.47

4-66
2.66
0.64
0.00
0.03
49.22
0.57
0.41
0.76

4-67
4.55
2.40
0.00
0.03
52.55
0.57
0.46
0.47

4-68
2.63
0.63
0.00
0.02
52.82
0.60
0.44
0.76

4-69
3.13
0.66
0.00
0.03
54.76
0.60
0.47
0.79

4-70
4.38
2.31
0.00
0.03
57.59
0.50
0.42
0.47

4-71
2.87
0.64
0.00
0.03
53.58
0.60
0.45
0.78

4-72
2.62
0.63
0.00
0.02
52.61
0.60
0.44
0.76

4-73
7.62
3.02
2.59
0.06
52.45
0.52
0.50
0.60

4-74
7.19
2.94
2.53
0.06
51.52
0.51
0.46
0.59

4-75
7.18
2.94
5.05
0.06
51.45
0.51
0.46
0.59

4-76
7.11
2.90
0.00
0.06
48.87
0.53
0.45
0.59

4-77
7.58
3.00
0.00
0.06
50.91
0.51
0.47
0.60

4-78
7.64
3.03
0.00
0.06
50.49
0.55
0.50
0.60

4-79
7.16
2.92
0.00
0.06
50.02
0.50
0.44
0.59

4-80
7.21
2.95
0.00
0.06
49.61
0.53
0.47
0.59

4-81
7.60
3.01
2.88
0.06
52.30
0.52
0.50
0.60

4-82
7.68
3.04
1.81
0.06
52.87
0.52
0.51
0.60

4-83
7.17
2.93
2.80
0.06
51.38
0.51
0.46
0.59

4-84
7.25
2.96
1.77
0.06
51.93
0.51
0.47
0.59

4-85
7.18
2.93
0.00
0.06
51.40
0.51
0.46
0.59

4-86
7.23
2.96
0.00
0.06
51.80
0.51
0.46
0.59

4-87
7.26
2.97
0.00
0.06
52.01
0.51
0.46
0.59

4-88
7.25
2.97
1.77
0.06
51.71
0.50
0.47
0.59

4-89
7.27
2.97
1.77
0.06
51.63
0.51
0.47
0.59

4-90
7.26
2.97
1.77
0.06
51.61
0.50
0.47
0.59

4-91
7.28
2.97
1.77
0.06
51.49
0.51
0.47
0.59

4-92
7.33
2.97
1.02
0.06
51.84
0.51
0.47
0.60

4-93
6.76
2.92
1.01
0.05
51.12
0.51
0.47
0.57

4-94
7.79
3.92
1.01
0.05
51.58
0.51
0.47
0.50

4-95
8.37
3.97
1.03
0.06
52.32
0.51
0.47
0.53

4-96
7.66
3.03
0.00
0.06
51.42
0.51
0.49
0.60

4-97
7.72
3.06
0.00
0.06
51.01
0.55
0.52
0.60

4-98
8.1
3.99
0
0.056139872
52.27
0.52362732
0.500365631
0.507407407

4-99
8.56
4.94
0
0.049359149
52
0.523461538
0.500183756
0.422897196

4-100
8.57
4.48
0
0.055767657
51.99
0.523369879
0.500091895
0.477246208

4-101
7.05
2.98
0
0.056867403
51.8
0.523552124
0.500276702
0.577304965

4-102
7.7
3.05
0
0.06383855
52.12
0.556600153
0.53141601
0.603896104

4-103
7.41
3.03
0
0.059983566
51.78
0.556778679
0.531624562
0.591093117

4-104
9.1
5.23
0
0.052811135
52.14
0.523590334
0.511715089
0.425274725

4-105
7.79
3.09
0
0.065669973
51.4
0.545525292
0.532573599
0.603337612

4-106
7.72
3.06
0
0.064884433
51.83
0.511672776
0.499717354
0.603626943

4-107
8.17
3.55
0
0.063279003
52.67
0.523447883
0.511502783
0.565483476

4-108
8.64
4.04
0
0.062893082
52.4
0.523473282
0.51156285
0.532407407

4-109
7.12
3.01
0
0.056132204
52.25
0.523444976
0.511501777
0.577247191

4-110
7.35
3.03
0
0.059365123
51.81
0.556649296
0.533777531
0.587755102

4-111
7.55
3.28
0
0.058501165
51.83
0.556627436
0.533765032
0.565562914

4-112
7.54
3.22
0
0.05918619
51.84
0.556712963
0.533851276
0.572944297

4-113
7.54
3.16
0
0.06000822
51.84
0.556712963
0.533851276
0.580901857

4-114
7.75
3.07
0
0.064418445
53.36
0.523425787
0.523425787
0.603870968

4-115
7.72
3.06
0
0.064046179
54.45
0.534802571
0.534802571
0.603626943

4-116
7.69
3.05
0
0.063675038
54.64
0.518850659
0.518850659
0.603381014

4-117
7.65
3.03
0
0.063296342
54.84
0.503282276
0.503282276
0.603921569

4-118
7.79
3.09
0
0.064800772
53.15
0.539981185
0.539981185
0.603337612

4-119
7.42
3.03
0
0.060980692
54.06
0.534961154
0.534961154
0.591644205

4-120
6.92
2.29
0
0.064755245
54.07
0.534862216
0.534862216
0.669075145

4-121
7.75
3.07
0
0.064676617
53.99
0.541211335
0.541211335
0.603870968

4-122
7.49
2.97
0
0.063084438
51.5
0.523495146
0.500185529
0.603471295

4-123
7.33
2.9
0
0.063060498
50.51
0.523460701
0.500189179
0.604365621

4-124
7.16
3.02
0
0.058211474
52.59
0.523483552
0.523483552
0.578212291

4-125
8.7
4.55
0
0.05690388
52.81
0.52357508
0.52357508
0.477011494

4-126
8.24
3.58
0
0.064019783
53.07
0.523459582
0.523459582
0.565533981

4-127
9.17
5.04
0
0.056521144
52.54
0.523601066
0.523601066
0.450381679

4-128
7.6
3.01
0
0.064412012
52.34
0.523500191
0.523500191
0.603947368

4-129
7.85
3.11
0
0.065569235
52.75
0.511658768
0.511658768
0.603821656

4-130
7.93
3.14
0
0.06648161
52.33
0.545576151
0.545576151
0.604035309

4-131
7.16
3.02
0
0.057452123
52.63
0.52365571
0.52365571
0.578212291

4-132
7.49
3.06
0
0.061382846
53.18
0.523505077
0.523505077
0.591455274

4-133
7.51
3.07
1.83
0.06158968
51.21
0.545596563
0.526772247
0.591211718

4-134
7.76
3.07
0
0.064591654
51.3
0.545614035
0.525140713
0.604381443

4-135
7.78
3.08
0
0.064908162
53.52
0.523542601
0.523542601
0.604113111

4-136
7.91
3.13
0
0.066287616
52.44
0.50553013
0.50553013
0.604298357

4-137
7.94
3.14
0
0.06668519
52.22
0.522405209
0.522405209
0.604534005

4-138
7.97
3.15
0
0.067074868
52.02
0.539792388
0.539792388
0.60476788

4-139
8.01
3.17
0
0.067475254
51.8
0.557142857
0.557142857
0.604244694

4-140
7.97
3.06
0
0.067519252
53.24
0.523666416
0.523666416
0.616060226

4-141
8.21
3.55
0
0.064019783
53.1
0.52354049
0.52354049
0.567600487

4-142
8.45
3.8
0
0.063829787
52.95
0.523512748
0.523512748
0.550295858

4-143
7.69
3.05
0
0.063657566
52.87
0.523359183
0.523359183
0.603381014

4-144
7.56
2.99
0
0.062346521
52.95
0.491406988
0.469929565
0.604497354

4-145
7.5
2.97
0
0.061615887
53.33
0.46015376
0.440337341
0.604

4-146
7.35
3.01
0
0.059249147
52.19
0.523471929
0.500183083
0.59047619

4-147
7.29
2.98
0
0.058679374
51.8
0.523552124
0.485673352
0.59122085

4-148
7.32
2.99
0
0.059032038
51.98
0.523470566
0.488685345
0.591530055

4-149
7.27
2.97
0
0.058479532
51.64
0.523431448
0.482937288
0.591471802

4-150
7.63
3.02
0
0.062280465
52.58
0.523583111
0.500272579
0.604193971

4-151
7.59
3.01
0
0.06171675
52.16
0.523389571
0.485505958
0.60342556

4-152
7.6
3.01
0
0.062262615
52.36
0.523491215
0.500182482
0.603947368

4-153
7.55
2.99
0
0.061696658
51.96
0.5234796
0.485627567
0.60397351

4-154
7.65
3.03
0
0.063097514
52.64
0.523556231
0.500272282
0.603921569

4-155
7.62
3.02
0
0.062884484
52.65
0.525735992
0.502450535
0.603674541

4-156
7.63
3.02
0
0.062995354
52.65
0.524786325
0.50154293
0.604193971

4-157
7.59
3.02
0
0.062508549
52.63
0.525175755
0.501906664
0.602108037

4-158
7.62
3.02
0
0.063074181
52.43
0.523555216
0.500273373
0.603674541

4-159
7.66
3.03
0
0.063113413
52.75
0.523601896
0.500362319
0.604438642

4-160
7.63
3.02
0
0.063176648
52.42
0.522319725
0.498997631
0.604193971

4-161
7.63
3.02
0
0.062909389
52.75
0.525876777
0.502627288
0.604193971

4-162
3.48
0.65
0
0.033014466
54.06
0.602848687
0.442618498
0.813218391

4-163
4.35
2.29
0
0.024051372
52.98
0.658550396
0.480313877
0.473563218

4-164
4.41
2.32
0
0.02446161
52.3
0.717399618
0.519307958
0.473922902

4-165
4.31
2.27
0
0.023792862
53.3
0.630393996
0.461348345
0.473317865

4-166
4.37
2.3
0
0.024199205
52.64
0.6875
0.499516908
0.473684211

4-167
3.94
1.48
0
0.028745034
53.19
0.65858244
0.480257746
0.624365482

4-168
3.53
0.66
0
0.033559401
53.42
0.658554848
0.48020748
0.813031161

4-169
3.2
0
0
0.037440037
53.61
0.658645775
0.480342811
1

4-170
6.7
2.93
0
0.050966608
51.19
0.50732565
0.464413448
0.562686567

4-171
6.65
2.9
0
0.050614118
50.94
0.507263447
0.464330638
0.563909774

4-172
6.55
2.86
0
0.049550154
50.23
0.507465658
0.439482759
0.563358779

4-173
6.83
2.89
0
0.053021128
50.5
0.507326733
0.445565217
0.576866764

4-174
5.95
2.79
0
0.042054831
48.91
0.507462687
0.416932639
0.531092437

4-175
6.21
2.81
0
0.045339379
49.18
0.507320049
0.422451744
0.547504026

4-176
6.46
2.82
0
0.048637092
49.47
0.507378209
0.428254564
0.563467492

TABLE 4-3(1)

Glass properties

Abbe's

nd − (0.2 ×
nd/
Glass transition

Refractive
number
Specific
Specific
Specific
temperature
λ80
λ70
λ5

No.
index nd
νd
weight
weigh + 1.18)
weight
Tg (° C.)
(nm)
(nm)
(nm)

4-1
1.92564
23.09
3.639
0.018
0.529
605
556
460
376

4-2
1.91696
23.17
3.631
0.011
0.528
607
541
454
374

4-3
1.92371
23.31
3.656
0.013
0.526
615
572
467
377

4-4
1.92372
23.50
3.659
0.012
0.526
623
552
453
374

4-5
1.91048

3.410
0.048
0.560
580
554
458
375

4-6
1.91272
23.06
3.418
0.049
0.560
583
548
456
374

4-7
1.92316
22.52
3.441
0.055
0.559
583
556
461
377

4-8
1.92110

3.441
0.053
0.558

555
459
376

4-9
1.92309

3.448
0.053
0.558

N/A
497
378

4-10
1.92293
22.63
3.449
0.053
0.558

541
455
376

4-11
1.92337

3.400
0.063
0.566
580
N/A
484
378

4-12
1.91933

3.394
0.061
0.566
577
549
459
376

4-13
1.90059
23.31
3.364
0.048
0.565
582
666
459
374

4-14
1.90590
22.97
3.372
0.051
0.565
571
N/A
478
374

4-15
1.90099
23.01
3.333
0.054
0.570

693
460
374

4-16
1.90643
22.88
3.341
0.058
0.571

N/A
500
375

4-17
1.87843
23.92
3.298
0.039
0.570
581
544
443
372

4-18
1.87702
23.79
3.295
0.038
0.570
575
N/A
461
373

4-19
1.88584
23.83
3.313
0.043
0.569
573
514
438
371

4-20
1.88581
24.02
3.329
0.040
0.566
582
528
439
371

4-21
1.88185
23.84
3.311
0.040
0.568

508
437
370

4-22
1.87894
23.70
3.266
0.046
0.575
582
526
443
372

4-23
1.87815
23.64
3.281
0.042
0.572

514
442
372

4-24
1.87486
23.77
3.262
0.042
0.575

505
437
372

4-25
1.87931
23.56
3.232
0.053
0.581

650
452
374

4-26
1.93027
22.53
3.429
0.064
0.563
580
562
473
379

4-27
1.92297
21.40
3.415
0.060
0.563
587
573
475
380

4-28
1.92238
22.77
3.429
0.057
0.561
594
564
471
379

4-29
1.90832
23.09
3.381
0.052
0.564
572
555
465
376

4-30
1.90598
22.63
3.372
0.052
0.565
578
563
471
378

4-31
1.92643
22.32
3.413
0.064
0.564
572
590
480
380

4-32
1.91948

3.382
0.063
0.568

666
487
381

4-33
1.90072
23.33
3.393
0.042
0.560
580
560
469
377

4-34
1.90098
23.35
3.413
0.038
0.557
585
569
468
376

4-35
1.90423
23.18
3.392
0.046
0.561
585
570
470
377

4-36
1.90037
23.40
3.397
0.041
0.559
580
568
466
375

4-37
1.88576
23.40
3.343
0.037
0.564
578
553
465
375

4-38
1.87933
23.47
3.341
0.031
0.563

548
463
375

4-39
1.87258
23.57
3.336
0.025
0.561

549
461
374

4-40
1.86530

3.331
0.019
0.560

602
464
373

4-41
1.89182
22.03
3.345
0.043
0.566

556
466
377

4-42
1.89719
23.33
3.345
0.048
0.567

564
469
377

4-43
1.89548
23.20
3.352
0.045
0.565

569
468
377

4-44
1.89641
23.24
3.356
0.045
0.565

549
464
377

4-45
1.90091
23.33
3.404
0.040
0.558
584
545
462
376

4-46
1.90124
23.49
3.457
0.030
0.550
586
565
469
377

4-47
1.90126
23.64
3.504
0.020
0.543
590
562
466
376

4-48
1.89547
23.57
3.406
0.034
0.557
586
561
464
375

4-49
1.89561
23.51
3.398
0.036
0.558
582
551
461
375

4-50
1.90107
23.33
3.402
0.041
0.559
581
551
465
376

4-51
1.89703
23.4
3.405
0.036
0.557
580
565
469
377

4-52
1.89909
23.4
3.406
0.038
0.558
581
566
468
376

4-53
1.89968
23.36
3.408
0.038
0.557
582
569
466
376

4-54
1.96914
22.11
3.89
0.011
0.506
657
639
500
388

4-55
1.8991
23.43
3.380
0.043
0.562
584
626
474
376

4-56
1.89915
23.42
3.375
0.044
0.563
586
579
468
376

4-57
1.90093
23.39
3.407
0.040
0.558
583
570
470
376

4-58
1.89667
23.45
3.400
0.037
0.558
582
557
465
376

4-59
1.89848
23.46
3.404
0.038
0.558
586
553
466
377

4-60
1.90705
23.43
3.417
0.044
0.558
578
561
472
378

4-61
1.90226
23.30
3.418
0.039
0.557
586
556
466
377

4-62
1.90216
23.37
3.425
0.037
0.555
589
551
464
376

4-63
1.89924
23.48
3.452
0.029
0.550
587
566
470
377

4-64
1.89899
23.53
3.399
0.039
0.559
583
565
469
377

4-65
1.9636
23.38
3.858
0.012
0.509
621
648
499
387

4-66
1.95856
22.26
3.830
0.013
0.511
639
656
499
387

4-67
1.95316
22.30
3.668
0.040
0.532
621
668
500
387

4-68
1.99951
21.92
3.890
0.042
0.514
636
N/A
518
394

4-69
2.00242
21.02
3.817
0.059
0.525
628
N/A
526
395

4-70
1.99474
20.78
3.787
0.057
0.527
616
N/A
520
393

4-71
1.99624
21.02
3.865
0.043
0.516
629
N/A
517
396

4-72
1.99462
21.17
3.907
0.033
0.511
637
N/A
516
395

4-73
1.90223
23.36
3.405
0.041
0.559
585
566
472
378

4-74
1.9023
23.44
3.459
0.031
0.550
589
564
469
377

4-75
1.90575
23.55
3.467
0.032
0.550
590
560
468
377

4-76
1.89824
23.79
3.498
0.019
0.543
589
549
462
376

4-77
1.89573
23.72
3.414
0.033
0.555
584
559
468
376

4-78
1.8959
23.61
3.399
0.036
0.558
586
569
472
377

4-79
1.89591
23.90
3.468
0.022
0.547
590
561
466
376

4-80
1.89598
23.79
3.452
0.026
0.549
588
555
465
376

4-81
1.90158
23.38
3.419
0.038
0.556
586
561
470
377

4-82
1.90054
23.36
3.382
0.044
0.562
586
561
468
377

4-83
1.90183
23.54
3.473
0.027
0.548
588
553
465
377

4-84
1.90052
23.54
3.436
0.033
0.553
587
551
464
376

4-85
1.89651
23.73
3.446
1.869
0.550
591
559
467
376

4-86
1.90232
23.46
3.456
1.871
0.550
581
564
471
377

4-87
1.90443
23.38
3.460
1.872
0.550
579
564
470
377

4-88
1.89848
23.60
3.433
1.867
0.553
586
554
468
377

4-89
1.89833
23.60
3.430
1.866
0.553
590
559
469
377

4-90
1.89847
23.69
3.437
1.867
0.552
590
548
466
376

4-91
1.89856
23.63
3.432
1.866
0.553
582
552
464
376

4-92
1.90048
23.64
3.438
1.868
0.553

571
475
377

4-93
1.89251
23.60
3.420
1.864
0.553

565
469
377

4-94
1.89666
23.51
3.438
1.868
0.552

558
467
377

4-95
1.90344
23.43
3.452
1.870
0.551

563
467
376

4-96
1.88811
23.77
3.379
1.856
0.559

575
466
375

4-97
1.88831
23.71
3.365
1.853
0.561

569
464
375

Specific
Tg
λ80
λ70
λ5

No.
nd
νd
weight
(° C.)
(nm)
(nm)
(nm)

4-98
1.89542
23.34
3.396
580
557
467
377

4-99
1.8914
23.41
3.395
584
566
468
376

4-100
1.89093
23.44
3.384
581
566
468
376

4-101
1.89112
23.14
3.38
590
556
465
377

4-102
1.89951
23.23
3.38
583
551
468
378

4-103
1.89942
23.36
3.388
588
553
467
377

4-104
1.8865
23.56
3.356
582
549
465
376

4-105
1.88826
23.64
3.345
582
545
463
376

4-106
1.88811
23.75
3.361

546
464
376

4-107
1.89457
23.41
3.365

552
466
377

4-108
1.88953
23.5
3.351

544
465
377

4-109
1.89895
23.5
3.393

543
465
377

4-110
1.90024
23.75
3.376
588
558
469
378

4-111
1.90025
23.29
3.378
590
558
469
378

4-112
1.90023
23.29
3.379

553
467
378

4-113
1.89992
23.3
3.377

552
465
377

4-114
1.89897
23.3
3.359
583
561
472
378

4-115
1.90618
22.84
3.361
583
566
475
379

4-116
1.90622
22.85
3.369
583
570
474
379

4-117
1.90606
22.92
3.376
582
609
475
378

4-118
1.89901
23.27
3.351
584
566
472
377

4-119
1.90185
22.87
3.351
586
595
479
379

4-120
1.90097
22.89
3.347
587
670
486
380

4-121
1.90296
22.92
3.35
583
560
469
378

4-122
1.88883
23.63
3.372
585
556
466
377

4-123
1.8786
23.91
3.349
589
548
461
375

4-124
1.8907
23.4
3.342
590
598
475
377

4-125
1.89048
23.4
3.345
583
561
471
377

4-126
1.89424
23.38
3.346
582
564
471
377

4-127
1.88593
23.54
3.332
584
552
466
377

4-128
1.88866
23.57
3.337
585
557
464
376

4-129
1.89279
23.57
3.353
581
559
468
377

4-130
1.89292
23.51
3.337
580
552
464
376

4-131
1.89479
23.47
3.356
590
556
469
377

4-132
1.89777
23.26
3.354
582
578
474
378

4-133
1.8924
23.68
3.361
585
550
466
377

4-134
1.89572
23.57
3.36
587
551
466
377

4-135
1.89843
23.24
3.354
581
546
454
372

4-136
1.88954
23.77
3.348
580
N/A
N/A
377

4-137
1.88958
23.73
3.343
582
N/A
668
376

4-138
1.88967
23.64
3.335
581
N/A
580
375

4-139
1.8876
23.54
3.326
582
N/A
546
374

4-140
1.89782
23.38
3.353
580
665
533
377

4-141
1.8959
23.39
3.353
583
N/A
556
377

4-142
1.89363
23.44
3.349
583
N/A
599
379

4-143
1.89767
23.49
3.364
584
N/A
628
379

4-144
1.89935
23.42
3.411
581
583
500
381

4-145
1.89904
23.53
3.43
584
578
490
378

4-146
1.89932
23.41
3.406
588
593
497
380

4-147
1.89937
23.62
3.426
587
580
500
381

4-148
1.90099
23.35
3.423
578
565
489
379

4-149
1.90325
23.32
3.426
588
591
500
381

4-150
1.90299
23.41
3.412
582
576
488
378

4-151
1.90284
23.41
3.437
583
570
490
379

4-152
1.90019
23.49
3.413
588
576
496
380

4-153
1.9003
23.51
3.433
586

4-154
1.90041
23.31
3.4
582
592
484
378

4-155
1.90055
23.31
3.4

591
483
378

4-156
1.9005
23.29
3.401
583
576
474
377

4-157
1.90049
23.29
3.4

572
473
377

4-158
1.89837
23.37
3.389
573
567
479
379

4-159
1.90132
23.29
3.4
582
569
483
379

4-160
1.89832
23.38
3.397
583
567
477
378

4-161
1.90151
23.25
3.402
583
558
473
378

4-162
2.01328
20.96
3.919
604
N/A
522
398

4-163
2.00332
20.96
3.88
612
N/A
525
397

4-164
2.00373
20.82
3.854
618
N/A
522
400

4-165
2.00319
21.01
3.89
619
N/A
517
396

4-166
2.00338
20.89
3.871
619
681
511
396

4-167
2.00866
20.89
3.888
605
N/A
527
399

4-168
2.01517
20.82
3.894
609
N/A
527
400

4-169
2.01957
20.77
3.903
621
N/A
529
400

4-170
1.89886
23.64
3.456
584
609
502
380

4-171
1.89904
23.74
3.464
594
587
488
378

4-172
1.89897
23.78
3.505
593
573
484
378

4-173
1.89946
23.69
3.496
590
562
478
378

4-174
1.89862
24.01
3.542
598
564
481
378

4-175
1.89917
23.93
3.534
589
567
482
379

4-176
1.89987
23.81
3.529
589
559
479
378

Example 4-2

The optical glasses (Nos. 4-1 to 4-97) prepared in Example 4-1 were compared with the optical glasses disclosed in Examples of Patent Documents 1 to 4. First, in a graph in which a mass ratio [Li₂O/{100−(SiO₂+B₂O₃+P₂O₅+GeO₂)}] is a vertical axis, and a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] is a horizontal axis, the optical glasses of Example 4-1 and the optical glasses disclosed in Examples of Patent Documents 1 to 4 were plotted. Results are illustrated in FIG. 4.

Next, in a graph in which a ratio [Refractive Index nd/Specific Weight] of the refractive index nd to the specific weight is a vertical axis, and a mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] is a horizontal axis, the optical glasses (Nos. 4-1 to 4-97) of Example 4-1 and the optical glasses disclosed in Examples of Patent Documents 1 to 4 were plotted. Note that, it is indicated that as the value of the ratio [Refractive Index nd/Specific Weight] that is the vertical axis increases, the refractive index increases, and the specific weight is further reduced. Results are illustrated in FIG. 5.

As illustrated in FIG. 4, the optical glasses of Example 4-1 and the optical glasses disclosed in Examples of Patent Documents 1 to 4 are distinguished by a line on which the mass ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+ZrO₂+SrO+BaO+ZnO+La₂O₃+Gd₂O₃+Y₂O₃+Ta₂O₅+Bi₂O₃)] that is the horizontal axis is 0.40, and a line on which the mass ratio [Li₂O/{100-(SiO₂+B₂O₃+P₂O₅+GeO₂)}] that is the vertical axis is 0.02.

In addition, as illustrated in FIG. 5, it is found that in the ratio [Refractive Index nd/Specific Weight] that is the vertical axis, the optical glasses of Example 4-1 have a value higher than that of the optical glasses disclosed in Examples of Patent Documents 1 to 4.

That is, it was found that the optical glasses of Example 4-1 were distinctively distinguished from the optical glasses disclosed in Examples of Patent Documents 1 to 4 on the basis of the composition, and had a remarkable effect that the ratio [Refractive Index nd/Specific Weight] was high.

Example 4-3

A lens blank was prepared by using each of the optical glasses prepared in Example 4-1 in accordance with a known method, and various lenses were prepared by processing the lens blank in accordance with a known method such as polishing.

The prepared optical lens was various lenses such as a planar lens, a biconvex lens, a biconcave lens, a plano-convex lens, a plano-concave lens, a concave meniscus lens, and a convex meniscus lens.

A secondary chromatic aberration was capable of being excellently corrected by combining various lenses with a lens including another type of optical glass.

Example 4-4

Each of the optical glasses prepared in Example 4-1 was processed into the shape of a rectangular thin plate having Length of 50 mm×Width of 20 mm×Thickness of 1.0 mm to obtain a light guide plate. The light guide plate was built in the head mounted display 1 illustrated in FIG. 2.

COMPARATIVE EXAMPLES

Glass samples having glass compositions shown in Table 5(1) were prepared by the following procedure, and various evaluations were performed. Note that, Comparative Examples 1 to 7 have the same compositions as those of the glasses disclosed in the following documents, respectively.

Comparative Example 1: Physics and Chemistry of Glasses, vol. 12, p. 93, 1971

Comparative Example 2: J. Non-Crystalline Solids, vol. 107, p. 244, 1989

Comparative Example 3: J. American Ceramic Soc., vol. 73, p. 2743, 1990

Comparative Example 4: Applied Optics, vol. 29, p. 3126, 1990

Comparative Example 5: Applied Optics, vol. 29, p. 3126, 1990

Comparative Example 6: JP Patent Application Laid Open 2003-252646

Comparative Example 7: J. American Ceramic Soc., vol. 94, p. 2086, 2011

[Manufacturing of Optical Glass]

First, an oxide, a hydroxide, a carbonate, and a nitrate corresponding to structural components of the glass were prepared as a raw material, the raw materials were weighed and blended such that a glass composition of optical glass to be obtained was each of the compositions shown in Table 5(1), and the raw materials were sufficiently mixed. A blended raw material (a batch raw material) obtained as described above was put in a platinum crucible, and was heated at 1350° C. to 1400° C. for 2 hours to be molten glass, and the molten glass was stirred, homogenized, and clarified, and then, was cast into a mold that was preheated to a suitable temperature. The cast glass was subjected to a heat treatment at approximately a glass transition temperature Tg for 30 minutes, and was allowed to cool in a furnace to a room temperature, and thus, a glass sample was obtained.

[Check of Glass Component Composition]

[Measurement of Optical Properties]

The obtained glass sample was further subjected to an annealing treatment at approximately the glass transition temperature Tg for approximately 30 minutes to 2 hours, and then, was cooled in the furnace to the room temperature at a temperature decrease rate of −30° C./hour, and thus, an annealed sample was obtained. In the obtained annealed sample, a refractive index nd and a specific weight were measured. Results are shown in Table 5(2).

(i) Refractive Index nd

In the annealed sample, the refractive index nd was measured by a refractive index measurement method of JIS standard JIS B 7071-1.

(ii) Specific Weight

The specific weight was measured by an Archimedes method.

[Observation of Glass]

The obtained glass sample was observed. In all of Comparative Examples 1 to 7, a part of the glass sample or the entire glass sample was devitrified, and thus, glass applicable to the optical glass was not capable of being obtained. Pictures of the glass samples obtained in Comparative Examples 1, 2, and 4 to 7 are illustrated in FIGS. 6 to 11, respectively.

TABLE 5(1)

% by mass

No.
SiO₂
Nb₂O₅
B₂O₃
Al₂O₃
Li₂O
Na₂O
K₂O
ZnO

Comparative
18.80
65.80
0
0
0
15.40
0
0

Example 1

Comparative
13.62
45.19
0
0
0
14.04
0
0

Example 2

Comparative
14.10
69.70
0
0
0
16.20
0
0

Example 3

Comparative
11.18
49.46
12.95
0
0
11.53
0
0

Example 4

Comparative
10.55
46.67
12.22
0
0
0
16.54
0

Example 5

Comparative
19.20
23.40
2.70
0
3.10
17.9
0
3.00

Example 6

Comparative
23.81
65.83
0
0
10.36
0
0
0

Example 7

Li₂O + Na₂O +
Gd₂O₃+
TiO₂+
TiO₂/(TiO₂+

No.
TiO₂
WO₃
Total
K₂O + Cs₂O
La₂O₃+ Y₂O₃
Nb₂O₅
Nb₂O₅)

Comparative
0
0
100
15.40
0
65.80
0

Example 1

Comparative
27.15
0
100
14.04
0
72.34
0.375

Example 2

Comparative
0
0
100
16.20
0
69.70
0

Example 3

Comparative
14.86
0
99.98
11.53
0
64.32
0.231

Example 4

Comparative
14.02
0
100
16.54
0
60.69
0.231

Example 5

Comparative
30.30
0.40
100
21.00
0
53.70
0.564

Example 6

Comparative
0
0
100
10.36
0
65.83
0

Example 7

TABLE 5(2)

% by mass
Glass

Li₂O/Li₂O +
Na₂O +
Li₂O/{100 − (SiO₂+
TiO₂/(TiO₂+ Nb₂O₅+ WO₃+
properties

Na₂O +
K₂O +
B₂O₃+
ZrO₂+ SrO + BaO + ZnO + La₂O₃+
Refractive

No.
K₂O + Cs₂O)
Cs₂O
P₂O₅+ GeO₂)}
Gd₂O₃+ Y₂O₃+ Ta₂O₅+ Bi₂O₃)
index

Comparative
0
15.40
0
0
1.93

Example 1

Comparative
0
14.04
0
0.375311031
1.95

Example 2

Comparative
0
16.20
0
0
2.10

Example 3

Comparative
0
11.53
0
0.231032338
1.93

Example 4

Comparative
0
16.54
0
0.231010051
1.88

Example 5

Comparative
0.1476190
17.90
0
0.530647986
1.85

Example 6

Comparative
1
0
0
0
1.99

Example 7

Glass properties

nd/
0.2 × Specific
nd − [0.2 ×

Specific
Specific
weight +
Specific

No.
weight
weight
1.18
weight + 1.18]

Comparative
3.7
0.521622
1.920
0.010

Example 1

Comparative
3.6
0.541667
1.900
0.050

Example 2

Comparative
3.994
0.525789
1.9788
0.1212

Example 3

Comparative
3.49
0.553009
1.878
0.052

Example 4

Comparative
3.23
0.582043
1.826
0.054

Example 5

Comparative
3.27
0.565749
1.834
0.016

Example 6

Comparative
3.57
0.557423
1.894
0.096

Example 7

It should be considered that the embodiments disclosed here are exemplary in all respects and not restrictive. The scope of the present invention is shown by the claims but not the above description, and is intended to include all modifications within the meaning and the scope equivalent to the claims.

For example, the optical glass according to one aspect of the present invention can be prepared by performing an adjustment of the composition described herein with respect to the glass composition exemplified above.

In addition, it is obvious that two or more respects described herein as an example or a preferable range can be arbitrarily combined.

Number	Date	Country	Kind
2020-042968	Mar 2020	JP	national
2020-050615	Mar 2020	JP	national
2020-050618	Mar 2020	JP	national
2020-050620	Mar 2020	JP	national

OPTICAL GLASS AND OPTICAL ELEMENT

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