Patent Application
20200400868
This application claims the benefit of priority of Japanese Patent Application Number 2019-115299, filed on Jun. 21, 2019, and Japanese Patent Application Number 2019-194993, filed on Oct. 28, 2019, the entire contents of which are hereby incorporated by reference.
The present disclosure relates to a color vision correction lens and an optical component.
Conventionally, eyeglass lenses for aiding the color differentiation ability of people with color vision deficiency have been known. For example, Japanese Unexamined Patent Application Publication No. 2002-303832 (Patent Literature (PTL) 1) describes an eyeglass lens for a person with color vision deficiency which has, on the surface of the lens, a partial reflection film having a spectral curve that monotonically increases or decreases the transmittance of a wavelength band which corresponds to a color which the person with color vision deficiency has difficulty differentiating.
However, the aforementioned conventional eyeglass lens for a person with color vision deficiency has a deeply tinted appearance, and therefore other people tend to find the appearance of the eyeglass lens somewhat odd.
In view of the above, the present disclosure aims to provide a color vision correction lens and an optical component which have a less deeply tinted appearance.
In order to provide such a color vision correction lens and an optical component, a color vision correction lens according to an aspect of the present disclosure is a color vision correction lens that corrects color vision of a user. The color vision correction lens includes: a resin layer having a first surface facing an eye of the user and a second surface on an opposite side of the first surface; and a reflective layer on a second surface side of the resin layer. The resin layer contains a color material which selectively absorbs light in a first wavelength band, the reflective layer selectively reflects light in a second wavelength band, and the first wavelength band and the second wavelength band overlap at least partially.
In addition, an optical component according to an aspect of the present disclosure includes the color vision correction lens.
According to the present disclosure, it is possible to provide a color vision correction lens, etc. which have a less deeply tinted appearance.
The figures depict one or more implementations in accordance with the present teaching, by way of examples only, not by way of limitations. In the figures, like reference numerals refer to the same or similar elements.
Hereinafter, a color vision correction lens and an optical component according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the embodiments described below each show a specific example of the present disclosure. Accordingly, the numerical values, shapes, materials, structural elements, the arrangement and connection of the structural elements, steps, an order of the steps, etc. described in the following embodiments are all mere examples, and thus are not intended to limit the present disclosure. Thus, structural elements not recited in any one of independent claims among structural elements in the following embodiments are described as optional structural elements.
Note that the drawings are schematic diagrams, and do not necessarily provide strictly accurate illustration. Thus, the scale, etc. of the drawings do not necessarily coincide with each other. Throughout the drawings, the same reference sign is given to substantially the same configuration, and redundant description is omitted or simplified.
In addition, each of a numerical value range, a term which indicates a relationship between structural elements, such as coincides with or equals to, and a term which indicates the shape of the structural elements, such as spherical or flat, is not an expression that only indicates the strict meaning of the expression, but includes the scope of the expression that is substantially the same. For example, each of the expressions includes a difference of about several percent. In addition, the word “approximately” means to include the range of plus or minus 10% of a numerical value or a numerical value range.
First, the configuration of a color vision correction lens according to Embodiment 1 will be described with reference to
Color vision correction lens 1 is a lens for correcting color vision deficiency which a person with color vision deficiency has. People with color vision deficiency are typically congenitally color-blind to red and green, and perceive green light more intensely than red light. Color vision correction lens 1 is capable of keeping a perceptional balance between red light and green light by reducing the transmission of green light, and thus color vision can be corrected.
Resin layer 10 is a plate-like, light-transmissive component. Specifically, resin layer 10 is formed by molding a transparent resin material into a predetermined shape. For example, resin layer 10 includes a resin material, such as acrylic resin, epoxy resin, urethane resin, polysilazane, siloxane, allyl diglycol carbonate (CR-39) or polysiloxane acrylic hybrid resin, polycarbonate, etc.
Resin layer 10 has the thickness of, for example, at least 1 mm and at most 3 mm. Resin layer 10 includes convex surface 11 and concave surface 12. Concave surface 12 is an example of a first surface of color vision correction lens 1 which faces an eye of user 90. Convex surface 11 is an example of a second surface which is on an opposite side of concave surface 12. That is, convex surface 11 is an outer principal surface which is on the opposite side of the eye of user 90.
Each of convex surface 11 and concave surface 12 has the radius of curvature of at least 60 mm and at most 800 mm. Each of convex surface 11 and concave surface 12 may have the radius of curvature of at least 100 mm and at most 300 mm. Convex surface 11 has the radius of curvature different from the radius of curvature of concave surface 12. For example, convex surface 11 has the radius of curvature smaller than the radius of curvature of concave surface 12. That is, the distance between convex surface 11 and concave surface 12, or in other words, the thickness of resin layer 10 is different depending on a portion of resin layer 10. Accordingly, resin layer 10 has both a thin portion and a thick portion.
Note that convex surface 11 and concave surface 12 may have the same radius of curvature. The distance between convex surface 11 and concave surface 12 may be constant regardless of a portion of resin layer 10. That is, resin layer 10 may have thickness that is uniform. The thickness of resin layer 10 may be less than 1 mm, or greater than 3 mm.
In addition, convex surface 11 and concave surface 12 each have, for example, a spherical surface, but need not have a complete spherical surface. For example, in a cross-sectional view of resin layer 10, the roundness of convex surface 11 and concave surface 12 may be at least several μm and at most ten-odd μm. Furthermore, one of convex surface 11 and concave surface 12 may be flat.
Resin layer 10 may have a function of condensing or diffusing light like a function performed by a convex lens or a concave lens. The size and the shape of resin layer 10 are, for example, the size and the shape suitable for a pair of eyeglasses, a contact lens, etc. wearable by a person.
Resin layer 10 contains a color material which selectively absorbs light in a first wavelength band. The color material is evenly dispersed in resin layer 10. Specifically, the color material is evenly dispersed inside of and throughout the entirety of resin layer 10 in the thickness direction and the surface direction of resin layer 10.
Note that the color material may be dispersed only in a portion of resin layer 10. For example, the color material may be dispersed only in the central portion of resin layer 10 when convex surface 11 of resin layer 10 is seen from the front face. Alternatively, the color material may be dispersed only in the outer layer part, including convex surface 11, in the thickness direction of resin layer 10.
The color material is a dye material which absorbs light in the first wavelength band. The first wavelength band is a wavelength band which includes the wavelength of an absorption peak of the color material. The first wavelength band is a range having the absorptance of at least a quarter of absorptance of the absorption peak in the absorption spectrum of the color material, for example. Note that the first wavelength band may be a range having the absorptance of at least a tenth of the absorptance of the absorption peak. The first wavelength band is in the range of at least 430 nm and at most 600 nm. The color material does not practically absorb any light other than light in the first wavelength band in the visible light band. For example, the color material has transmittance of at least 80% with respect to light other than light in the first wavelength band. The visible light band is in the range of, for example, at least 380 nm and at most 780 nm.
The color material includes at least one type of dye material. For example, resin layer 10 includes several types of dye materials which are mixed together and dispersed throughout resin layer 10. A porphyrin dye, a phthalocyanine dye, a merocyanine dye, or a methine dye can be used as a dye material, for example.
The transmittance is at most 80% in a wavelength ranging from 430 nm to 600 nm in the transmission spectrum illustrated in
Note that the transmission spectrum (absorption spectrum) of resin layer 10 is not limited to the example illustrated in
Reflective layer 20 is on the convex surface 11 side of resin layer 10. Specifically, reflective layer 20 is disposed on convex surface 11 as illustrated in
Reflective layer 20 selectively reflects light in a second wavelength band. Specifically, reflective layer 20 reflects light in the second wavelength band, and allows light other than the light in the second wavelength band to pass through. The second wavelength band is a range having reflectance of at least a quarter of the reflectance of a reflection peak in the reflection spectrum of reflective layer 20, for example. Note that the second wavelength band may be a range having the reflectance of at least a tenth of the reflectance of the reflection peak. The second wavelength band is narrower than the first wavelength band in the embodiment, and is entirely included in the first wavelength band. For example, the second wavelength band is in the range of at least 500 nm and at most 570 nm. That is, reflective layer 20 reflects green light. The peak reflectance of reflective layer 20 is at least 10% and at most 99%.
The transmittance is at most 80% in a wavelength ranging from 550 nm to 580 nm in the transmission spectrum illustrated in
As such, in the embodiment, the reflection peak of reflective layer 20 is included in a wavelength band (first wavelength band) of the absorption peak of resin layer 10. The full width at half maximum of the reflection peak is narrower than the full width at half maximum of the absorption peak. That is, reflective layer 20 has the reflection peak that is steeper than the absorption peak of resin layer 10. The steep reflection peak is formed due to a colloidal crystal structure. Accordingly, reflective layer 20 includes the colloidal crystal structure in the embodiment. Reflective layer 20 reflects a portion of incident light using Bragg reflection exhibited by the colloidal crystal structure, and allows the remaining portion of the incident light to pass through.
Matrix material 21 is provided so as to fill spaces between the plurality of colloidal particles 22. Matrix material 21 includes an organic material. The organic material which matrix material 21 includes is a resin material having a high light transmittance in the visible light band. Specifically, as the resin material, at least one material selected from a group consisting of acrylic resin, polycarbonate resin, cycloolefin resin, epoxy resin, silicone resin, an acrylic styrene copolymer, styrene resin, and urethane resin can be used.
The plurality of colloidal particles 22 each have the size of a colloidal dimension. All of the plurality of colloidal particles 22 have the same size and the same shape. The colloidal dimension is equivalent to a nano-order size. Specifically, colloidal particle 22 is a spherical particle having a diameter of at least 1 nm and less than 1000 nm. For example, colloidal particle 22 may have the diameter of at least 150 nm and at most 300 nm.
Colloidal particle 22 includes at least one of an inorganic material and a resin material. That is, colloidal particle 22 may only include the inorganic material or the resin material. Alternatively, colloidal particle 22 may include both the inorganic material and the resin material.
The inorganic material may be, for example, a metal, such as gold or silver, or a metallic oxide, such as silica, alumina, or titania. In addition, the resin material may be styrene resin or acrylic resin. Colloidal particle 22 may include, among the aforementioned materials, one type of material or several types of materials combined.
The colloidal crystal structure includes the plurality of colloidal particles 22 which are regularly and three-dimensionally arranged. The mean value of center-to-center distance d between colloidal particles 22 is, for example, at least 100 nm and at most 500 nm. The mean value of center-to-center distance d may be at least 200 nm and at most 350 nm, or may be at least 220 nm and at most 300 nm. An adjustment to the mean value of center-to-center distance d makes it possible to realize reflective layer 20 which reflects light having a desired wavelength component. Specifically, it is possible to realize reflective layer 20 having a steep reflection peak and the full width at half maximum that is narrow. Note that center-to-center distance d can be checked by examining the surface of the colloidal crystal structure with a scanning electron microscope.
In addition, the ratio of the total volume of all colloidal particles 22 to the volume of reflective layer 20 is, for example, at least 10 vol % and at most 60 vol %. Alternatively, the ratio may be at least 20 vol % and at most 50 vol %, and may be at least 25 vol % and at most 40 vol %, By limiting the ratios within the ranges as described above, the colloidal crystal structure is capable of having suitable light transmittance and suitable shape stability. Adjacent colloidal particles 22 may be in contact with each other.
The thickness of reflective layer 20 is less than that of resin layer 10. For example, the thickness of reflective layer 20 is at least 10 μm and less than 3000 μm (3 mm), The thickness of reflective layer 20 may be at least 1 mm. For example, the thickness of reflective layer 20 may be at least 30 μm and at most 50 μm.
Note that so long as reflective layer 20 is capable of reflecting light in the second wavelength band, the shape, the size, and the regularity of the plurality of colloidal particles 22 need not be precise. That is, the plurality of colloidal particles 22 may include colloidal particles not in the shape of a sphere and in different sizes. In addition, the plurality of colloidal particles 22 may be irregularly arranged.
Reflective layer 20 is formed by hardening dispersion liquid applied on convex surface 11 of resin layer 10. The dispersion liquid is obtained by dispersing the plurality of colloidal particles 22 in a raw material, such as aforementioned acrylic resin, which is included in matrix material 21. Note that the method of forming reflective layer 20 is not particularly limited.
For example, a spray coating method, a spin coating method, a slit coating method, a roll coating method, etc. can be used as a method to apply the dispersion liquid. In addition, the method of polymerizing monomers is not limited. The monomers may be polymerized by heating, and by using an active energy ray (an electromagnetic wave, an ultraviolet ray, visible light, infrared light, an electron beam, a gamma ray, etc.). When the monomers are polymerized using an active energy ray, a photopolymerization initiator, etc. may be added to the dispersion liquid. A well-known photopolymerization initiator, such as a radical photopolymerization initiator, a cationic photopolymerization initiator, and an anionic photopolymerization initiator, etc., can be used as the photopolymerization initiator.
An eye of user 90 who is a person with color vision deficiency receives light L2 which has passed through color vision correction lens 1 in the order of reflective layer 20 and resin layer 10. Light L2 is a portion of light L1 which enters color vision correction lens 1 from the reflective layer 20 side and passes through color vision correction lens 1. Another portion of light L1 is reflected as reflected light L1r when light L1 passes through reflective layer 20.
In this embodiment, reflective layer 20 reflects green light, and resin layer 10 absorbs green light. For this reason, light L2 mainly includes, among a red component (R), a green component (G), and a blue component (B) included in light L1, the red component and the blue component since the green component is either reflected or absorbed. This removal of the green component enables user 90 who is a person with color vision deficiency to keep the perceptional balance between red and green, and thus color vision can be corrected. That is, the function of correcting color vision which color vision correction lens 1 performs can be sufficiently demonstrated.
On the other hand, when other person 91 looks at the face of user 90, an eye of other person 91 receives light L4, which has passed through color vision correction lens 1 in the order of resin layer 10 and reflective layer 20, and reflected light L1r, which is a portion of light L1. Light L4 is a portion of light L3 which enters color vision correction lens 1 and passes through color vision correction lens 1 from the resin layer 10 side.
Since resin layer 10 absorbs the green component included in light L3, light L4 mainly includes the red component and the blue component. An eye of other person 91 receives mixed light which includes the red component, the green component, and the blue component since reflected light L1r which is green light is added to light L4 in the embodiment.
Note that (a) of
When reflective layer 20 is not provided, light L4 illustrated in (a) of
Note that as illustrated in (b) and (c) of
Next, color vision correction lens 1 according to a variation will be described. In comparison with Embodiment 1, reflective layer 20 has a different configuration in the variation described below. The following mainly describes a difference between the variation and Embodiment 1, and the description of the common features will be omitted or simplified.
Dielectric film 121 and dielectric film 122 each include a light-transmissive material having a refractive index different from each other. For example, dielectric film 121 and dielectric film 122 each include a titanium oxide film, a hafnium oxide film, a silicon oxide film, etc. Adjustments to the thickness and the refractive index of each film and the selection of a material for each film allow light having a targeted wavelength to be reflected and light having a wavelength other than the targeted wavelength to pass through.
The transmittance is at most 80% in a wavelength ranging from 525 nm to 604 nm in the transmission spectrum illustrated in
As such, reflective layer 120 which includes the multilayer reflective film has the reflection peak that is less steep than the reflection peak of reflective layer 20 which includes the colloidal crystal structure. In this case, a portion of second wavelength band λ2 of light which reflective layer 120 reflects need not be included in first wavelength band λ1 of light which resin layer 10 absorbs as illustrated in
Note that (a) of
As illustrated in (c) of
Color vision correction lens 1 described above is used for various optical components.
For example, pair of eyeglasses 30 includes two color vision correction lenses 1 as right and left lenses, and frame 31 which supports the two color vision correction lenses 1. Each of contact lenses 32 and intraocular lens 34 are color vision correction lens 1 as a whole. Alternatively, only the center portion of contact lenses 32 and intraocular lens 34 may be color vision correction lens 1. Pair of goggles 36 includes one color vision correction lens 1 as a cover lens for covering both eyes.
Note that pair of eyeglasses 30, contact lenses 32, intraocular lens 34, and pair of goggles 36 each may include a color vision correction lens which includes reflective layer 120 described above in the variation.
As has been described above, color vision correction lens 1 according to the embodiment corrects the color vision of user 90. Color vision correction lens 1 includes resin layer 10 that includes concave surface 12 which is an example of a first surface facing an eye of user 90 and convex surface 11 which is an example of a second surface on the opposite side of concave surface 12, and reflective layer 20 or 120 which is disposed on the convex surface 11 side. Resin layer 10 contains a color material which selectively absorbs light in the first wavelength band. Reflective layer 20 or 120 selectively reflects light in the second wavelength band. The first wavelength band and the second wavelength band overlap at least partially.
Accordingly, when other person 91 who is different from user 90 looks at color vision correction lens 1, an eye of other person 91 receives mixed light in which reflected light L1r reflected by reflective layer 20 and light L4 that passes through color vision correction lens 1 are mixed. Although a component of the first wavelength band is reduced from light L4 due to absorption by resin layer 10, at least a portion of the reduction is supplemented by reflected light L1r in the second wavelength band. Thus, it is possible to provide color vision correction lens 1 which has a less deeply tinted appearance. In addition, reflective layer 20 or 120 may be disposed on convex surface 11, for example. With this, it is possible to realize color vision correction lens 1 that is smaller and lighter since resin layer 10 and reflective layer 20 can be adhere to each other.
Note that when user 90 uses color vision correction lens 1, an eye of user 90 receives light L2 from which first wavelength band component is reduced due to resin layer 10. For this reason, it is possible to sufficiently demonstrate an essential function (color vision correction function) of color vision correction lens 1.
In addition, the second wavelength band is in the range of at least 500 nm and at most 570 nm, for example.
With this, color vision correction lens 1, which corrects the color vision of a person who is congenitally color-blind to red and green, can have a less deeply tinted appearance since the transmission of green light is reduced.
In addition, reflective layer 20 or 120 has the peak reflectance of at least 10% and at most 99%.
With the adjustment of the peak reflectance as above, it is possible to reduce the glittering (glaring) of color vision correction lens 1.
In addition, the second wavelength band is narrower than the first wavelength band, and is entirely included in the first wavelength band, for example.
Accordingly, the amount of light of reflected light L1r can be reduced by making the second wavelength band narrower even when the peak reflectance is high. Therefore, it is possible to reduce the glittering of color vision correction lens 1.
In addition, reflective layer 20 includes the colloidal crystal structure, for example.
With this, the reflection spectrum of the colloidal crystal structure is less dependent on angles. Thus, color vision correction lens 1 can have a less deeply tinted appearance not only when color vision correction lens 1 is seen from the front face, but also from an oblique direction. In addition, the colloidal crystal structure can readily form a steep reflection peak. That is, the peak reflectance of reflective layer 20 can be increased, and the full width at half maximum of the reflection peak can be made narrower. This can suppress the intense reflection by reflective layer 20, or in other words, the amount of light of reflected light L1r. Therefore, color vision correction lens 1 can have a less glittering appearance.
As has been described above, the optical components according to the embodiment each include color vision correction lens 1. The optical components are, for example, pair of eyeglasses 30, contact lenses 32, intraocular lens 34, or pair of goggles 36.
With this, an optical component wearable by user 90, such as pair of eyeglasses 30, can be realized. If user 90 happens to wear pair of eyeglasses 30 which does not have a less deeply tinted appearance, other person 91 may find the appearance of pair of eyeglasses 30 somewhat odd. Since pair of eyeglasses 30 has a less deeply tinted appearance according to the embodiment, it is possible to reduce the sense of oddness felt by other person 91 in daily life.
Next, Embodiment 2 will be described.
In Embodiment 2, a resin layer and a reflective layer are separable. In other words, the reflective layer is capable of changing the positional relationship relative to the resin layer. The following mainly describes a difference between Embodiment 2 and Embodiment 1, and the description of the common features will be omitted or simplified.
The two color vision correction lenses 201 have the same configuration. Note that the two color vision correction lenses 201 are for a left eye and a right eye, and thus the shape of color vision correction lens 201 for the left eye is different from the shape of color vision correction lens 201 for the right eye.
As illustrated in
In a plan view of convex surface 11 of resin layer 10, reflective layer 220 is movable to a position at which reflective layer 220 covers convex surface 11 and a position at which reflective layer 220 does not cover convex surface 11. For example, reflective layer 220 is rotatably attached to frame 31 of pair of eyeglasses 38. Specifically, as illustrated in
As illustrated in (a) of
Reflective film 222 is the same as reflective layer 20 according to Embodiment 1. Reflective film 222 is disposed on transparent base material 221. Reflective film 222 may be the same as reflective layer 120 according to the variation of Embodiment 1.
When reflective layer 220 and resin layer 10 overlap each other as illustrated in (a) of
Note that since a portion of light L1 is reflected as reflected light L1r when light L1 enters reflective layer 220, the intensity of light received by user 90 decreases. On the contrary, since no light is attenuated by reflective layer 220 when reflective layer 220 and resin layer 10 do not overlap each other as illustrated in (b) of
As has been described above, color vision correction lens 201 according to the embodiment includes reflective layer 220 that is movable to a position at which reflective layer 220 covers convex surface 11 and a position at which reflective layer 220 does not cover convex surface 11 in a plan view of convex surface 11 of resin layer 10.
With this, it is possible to switch between improvement in the appearance of user 90 and the assurance of the visibility of user 90 according to circumstances.
Note that resin layer 10 and reflective layer 220 may be completely separated. That is, color vision correction lens 201 may include resin layer 10 and reflective layer 220 which are attachable to and detachable from each other. For example, shaft 230 which supports two reflective layers 220 may be provided with a clip member. Reflective layer 220 can overlap resin layer 10 by fastening the clip member to frame 31 of pair of eyeglasses 38. By removing the clip member from frame 31, reflective layer 220 does not overlap resin layer 10. The way of attaching reflective layer 220 to resin layer 10 and the way of detaching reflective layer 220 from resin layer 10 are not particularly limited. In addition, although (a) of
The following describes the concept of designing an optical characteristic and a result obtained by simulating the optical characteristic of the color vision correction lenses according to the embodiments described above.
As has been described above, the present disclosure aims to provide color vision correction lens 1 or 201 according the embodiments which has a less deeply tinted appearance. Specifically, the present disclosure aims to reduce the sense of oddness felt by other person 91 when other person 91 sees user 90 who has color vision deficiency and is using color vision correction lens 1 or 201.
For example, when color vision correction lenses 1 or 201 are used for pair of eyeglasses 30 or 38, other person 91 will look at the eyes and the skin around the eyes of user 90 via color vision correction lenses 1 or 201. For this reason, the oddness felt by other person 91 can be reduced if the human skin color seen via color vision correction lenses 1 or 201 is closer to the original human skin color. Note that the original human skin color is the color seen not via color vision correction lens 1 or 201. Accordingly, the optical characteristic of color vision correction lens 1 or 201 is designed such that the human skin color is closer to the original human skin color when the human skin color and color vision correction lens 1 or 201 overlap each other. Specifically, a condition that is appropriate for the reflection spectrum of reflective layer 20, 120, or 220 of color vision correction lens 1 or 201 is determined, and the reflection spectrum of reflective layer 20, 120, or 220 is adjusted so as to satisfy the condition determined.
The condition that is appropriate means that the peak wavelength of the second wavelength band of reflective layer 20, 120, or 220 is in the range in which CIE 1931 chromaticity coordinates are shifted toward white. The CIE 1931 chromaticity coordinates are obtained from a reflection spectrum which is obtained by multiplying the spectral reflectance of human skin and the spectral absorptance of color vision correction lens 1 or 201. Note that the CIE 1931 chromaticity coordinates are coordinates in the CIE 1931 color space defined by the Commission Internationale de l'Eclairage (CIE).
In designing color vision correction lens 1 or 201, the CIE 1931 chromaticity coordinates are calculated by multiplying, for example, the reflection spectrum of either “beautiful skin” or “aged skin” illustrated in
A plurality of arrows 304 in
For example, suppose the CIE 1931 chromaticity coordinates which are obtained by multiplying the spectral reflectance of human skin and the transmission spectrum of resin layer 10 are to be (x1, y1). And suppose the CIE 1931 chromaticity coordinates of the peak wavelength of the reflection peak of reflective layer 20, 120, or 220 are to be (x2, y2). In this case, a line segment (straight line) connecting (x1, y1) and (x2, y2) passes through white region 303. As such, the peak wavelength of the reflection peak of reflective layer 20, 120, or 220 is determined so as to obtain a line segment which passes through white region 303. That is, the shifting of CIE 1931 chromaticity coordinates, which is obtained from a reflection spectrum obtained by multiplying the spectral reflectance of human skin and the spectral absorptance of resin layer 10, to white is to shift the CIE 1931 chromaticity coordinates (x1, y1) toward white region 303.
The following describes results obtained from simulations performed on color vision correction lens 1 or 201.
The color of the appearance of color vision correction lens 1 or 201 is calculated in the simulations in which a color of human skin and the transmission spectrum (the absorption spectrum of a color material) of resin layer 10 are fixed values, and the peak wavelength and the reflectance of reflective layer 20, 120, or 220 are variables. Note that the color of the appearance is the color of color vision correction lens 1 or 201 when color vision correction lens 1 or 201 is seen from the reflective layer side.
Table 2 below indicates results obtained from the simulations. In Table 2, Wavelength (unit: nm) indicates peak wavelengths of reflective layer 20, 120, or 220. Reflectance (unit: %) indicates reflectance of the peak wavelengths of reflective layer 20, 120, or 220. Note that the full width at half maximum of the reflection peak is 20 nm. The letters x and y denote CIE 1931 chromaticity coordinates of colors of the appearance of color vision correction lens 1 or 201. Values indicated for Wavelength and Reflectance are input values, and values indicated for the letters x and y are output values. That is, CIE 1931 chromaticity coordinates (x, y) are calculated for each of combinations of a value of a wavelength and a value of reflectance. A value of a wavelength and a value of reflectance, which are the input values, determine the amount of change (specifically, the direction and the length of arrow 304 illustrated in
Comparative example indicated in Table 2 is the case in which reflective layer 20, 120, or 220 is not provided. In this case, the result which is obtained by multiplying the reflection spectrum of human skin and the transmission spectrum (the absorption spectrum of a color material) of resin layer 10 is simply obtained. The CIE 1931 chromaticity coordinates (x, y) are (0.401, 0.279), respectively, and the color pink, that is the color of resin layer 10, is most noticeable. Note that the CIE 1931 chromaticity coordinates (x, y) according to Comparative example are the CIE 1931 chromaticity coordinates (x1, y1) obtained by multiplying the spectral reflectance of human skin and the transmission spectrum of resin layer 10.
CIE 1931 chromaticity coordinates (x, y) of each of Examples 1 through 7 are closer to a skin color compared to Comparative example. That is, the color of an appearance becomes closer to the skin color by providing a reflective layer, and thus color vision correction lens 1 or 201 can have a natural appearance with reduced sense of oddness. Among Examples 1 through 7, Example 7 has obtained a color closest to the skin color.
In addition, among Examples 1 and 4 through 6 having the same reflectance of 20% and different peak wavelengths, Example 4 has obtained a color that is closest to the color of Comparative example, and Example 1 has obtained a color that is closest to the skin color. From the above, it can be understood that the obtaining of a color that is closer to the skin color is more effective when the peak wavelength is closer to the short wavelength region.
Furthermore, among Examples 1 through 3 having the same peak wavelength of 550 nm and different reflectance, Example 1 has obtained a color that is closest to the color of Comparative example, and Example 3 has obtained a color that is closest to the skin color. From the above, it can be understood that the obtaining of a color that is closer to the skin color is more effective when the reflectance is higher. Similarly, Example 7 having a high reflectance has obtained a color closest to the skin color when Example 7 is compared with Example 6.
As has been described above, we have found out that, through the simulations, the appearance of color vision correction lens 1 or 201 can be improved by providing reflective layer 20, 120, or 220. In addition, we have considered an influence on user 90, or in other words, an influence on a color vision correction function caused by providing reflective layer 20, 120, or 220.
In comparison with the case in which reflective layer 20, 120, or 220 is not provided, the intensity of light is decreased at the wavelength of around 510 nm when reflective layer 20, 120, or 220 is provided as illustrated in
As has been described above, in color vision correction lens 1 or 201, the peak wavelength of the second wavelength band which is the reflection range of light reflected by reflective layer 20, 120, or 220 is in the range in which the CIE 1931 chromaticity coordinates (x1, y1) are shifted toward white (white region 303). The CIE 1931 chromaticity coordinates are obtained from a reflection spectrum which is obtained by multiplying the spectral reflectance of human skin and the spectral absorptance of resin layer 10.
With this, it: is possible to realize color vision correction lens 1 or 201 having an appearance with reduced sense of oddness while ensuring a color vision correction function.
The color vision correction lenses and the optical components according to the present disclosure have been described as above based on the embodiments; however, the present disclosure is not limited to the aforementioned embodiments.
For example, the inclusion relation between light in the first wavelength band which resin layer 10 absorbs and light in the second wavelength band which reflective layer 20 reflects is not particularly limited. The second wavelength band may completely include first wavelength band, for example. The lower limit of the first wavelength band may be less than the lower limit of the second wavelength band, and may be greater than or equal to the lower limit of the second wavelength band. The upper limit of the first wavelength band may be greater than the upper limit of the second wavelength band, and may be less than or equal to the upper limit of the second wavelength band. In addition, the first wavelength band and the second wavelength band may be completely the same. Furthermore, the width of the first wavelength band may be narrower than or equal to the width of the second wavelength band.
In addition, the peak reflectance of reflective layer 20 or 120 may be greater than 99%, and may even be 100%, for example. In addition, the peak reflectance of reflective layer 20 or 120 may be less than 10%.
Furthermore, light in the first wavelength band which resin layer 10 of color vision correction lens 1 absorbs and light in the second wavelength band which reflective layer 20 or 120 reflects need not be the green wavelength band. The first wavelength band and the second wavelength band each may be a wavelength band suitable for color vision correction lens 1 to balance the color vision.
Moreover, resin layer 10 of color vision correction lens 1 may be a flat plate. Specifically, each of the first surface of resin layer 10 which faces user 90 and the second surface on an opposite side of the first surface may have a flat surface. In addition, the second surface of resin layer 10 may have a concave surface.
The present disclosure also encompasses: embodiments achieved by applying various modifications conceivable to those skilled in the art to each embodiment; and embodiments achieved by optionally combining the structural elements and the functions of each embodiment without departing from the essence of the present disclosure.
While the foregoing has described one or more embodiments and/or other examples, it is understood that various modifications may be made therein and that the subject matter disclosed herein may be implemented in various forms and examples, and that they may be applied in numerous applications, only some of which have been described herein. It is intended by the following claims to claim any and all modifications and variations that fall within the true scope of the present teachings.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-115299 | Jun 2019 | JP | national |
| 2019-194993 | Oct 2019 | JP | national |
