Patent Application
20150218877
1. Field of the Invention
The present invention relates to insulated glazing and methods of producing insulated glazing.
2. Description of the Related Art
So-called “vacuum insulated glazing”, which is formed by stacking a pair of glass substrates in layers with a gap interposed between them and maintained in a low-pressure or vacuum state, has a good heat insulating effect and is therefore used widely for, for example, window glass for constructions such as buildings and houses.
In the vacuum insulated glazing, the sealing performance of a sealing member provided around the gap to maintain the gap in a vacuum state has a significant effect over the heat insulating properties of the entire vacuum insulated glazing. This is because if the sealing member has poor sealing properties, components such as air and/or moisture in the atmosphere easily enter the gap through the sealing member, thereby decreasing the degree of vacuum of the gap. Therefore, work is proceeding with sealing members having better sealing properties.
In particular, recently, a sealing member formed of a metal member and a non-metal member has been developed. For example, Patent Document 1 discloses forming a sealing structure by combining a metal member and glass frit in vacuum insulated glazing.
According to an aspect of the present invention, insulated glazing includes a first glass substrate including a first surface, a second glass substrate including a second surface facing the first surface across a gap, and a sealing member hermetically sealing the gap. The sealing member includes a metal member of a frame shape including third and fourth surfaces, and first and second joining layers. The first joining layer is placed in a frame shape on the first surface of the first glass substrate. The second joining layer is placed in a frame shape on the second surface of the second glass substrate, and is in a position offset from the position of the first joining layer when viewed in a thickness direction of the insulated glazing. The first joining layer is bonded to part of the third surface of the metal member. The second joining layer is bonded to part of the fourth surface of the metal member.
According to an aspect of the present invention, a method of producing insulated glazing including first and second glass substrates stacked in layers with a gap interposed therebetween includes forming a first joining layer in a frame shape on a first surface of the first glass substrate and forming a second joining layer in a frame shape on a second surface of the second glass substrate; preparing a metal member of a frame shape that includes a third surface and a fourth surface; forming an assembly by stacking the first glass substrate, the metal member, and the second glass substrate in layers in this order, wherein the first glass substrate is placed with the first surface facing the third surface of the metal member and the second glass substrate is placed with the second surface facing the fourth surface of the metal member, so that the second joining layer is in a position offset from the position of the first joining layer when the assembly is viewed in a stacking direction thereof; and firing the assembly to bond the first and second joining layers and the metal member.
As described above, Patent Document 1 discloses a sealing structure into which a metal member and glass frit are combined.
For example, Patent Document 1 discloses vacuum insulated glazing 1 including a first glass substrate 2, a second glass substrate 3, a gap 6 formed between the glass substrates 2 and 3 with spacers 5, and a sealing structure 20 formed around the gap 6 as a first configuration as illustrated in
According to this sealing structure 20, however, the vacuum insulated glazing 1 may warp or deform when a temperature difference is caused between the first glass substrate 2 and the second glass substrate 3 to cause a difference in the degree of thermal expansion between them. In particular, when such a phenomenon becomes conspicuous, the vacuum insulated glazing 1 may be broken.
Furthermore, Patent Document 1 also illustrates vacuum insulated glazing 51 having another structure as illustrated in
There is a problem, however, in that this sealing structure 70 is extremely difficult to produce.
For example, it is necessary to prepare the U-shaped metal member 71 having a frame shape in order to produce the sealing structure 70. It is virtually impossible, however, to provide a metal member of such a three-dimensional shape as a one-piece product (a seamless member). Therefore, it is necessary to join multiple members into a one-piece body by welding or the like in order to obtain the U-shaped metal member 71 having a frame shape.
Here, it is necessary for the U-shaped metal member 71 to be formed extremely thin so as to fall within the height of the gap 6 (for example, 150 μm). It is extremely difficult, however, to form such a thin member of a complicated shape by joining such as welding. Furthermore, because the U-shaped metal member 71 is used as a member for a sealing structure, the joints are required to have high sealing characteristics without a defect or gap. A joining technique of extremely high accuracy is necessary to form such joints having high sealing characteristics in a member of a complicated shape.
Thus, each of the two types of vacuum insulated glazing 1 and 51 described in Patent Document 1 is far from satisfactory in the structure of the sealed part, so that there is still a demand for vacuum insulated glazing that is less likely to be affected by deformation due to a thermal stress and is relatively easy to produce.
According to the present invention, it is possible to provide insulated glazing that is capable of significantly reducing the effect of deformation due to a thermal stress and has a sealing structure that is relatively easy to produce. Furthermore, according to the present invention, it is possible to provide a method of producing insulated glazing that is capable of significantly reducing the effect of deformation due to a thermal stress and has a sealing structure that is relatively easy to produce.
A description is given below, with reference to the accompanying drawings, of embodiments of the present invention.
A description is given below, with reference to
In the following description, “vacuum insulated glazing” is taken as an example of insulated glazing, and a description is given of configurations and features thereof. It is clear to a person skilled in the art, however, that the present invention is not limited to “vacuum insulated glazing” and may also be similarly provided for “non-vacuum” insulated glazing.
As illustrated in
The first glass substrate 110 includes a first surface 112 and a first exterior surface 114. In the vacuum insulated glazing 100, the first glass substrate 110 is placed so that the first exterior surface 114 faces outward. Likewise, the second glass substrate 120 includes a second surface 122 and a second exterior surface 124. In the vacuum insulated glazing 100, the second glass substrate 120 is placed so that the second exterior surface 124 faces outward. Accordingly, the gap 130 is formed between the first surface 112 of the first glass substrate 110 and the second surface 122 of the second glass substrate 120.
Normally, a vacuum is maintained inside the gap 130. Here, the degree of vacuum of the gap 130 is not limited in particular, and may be any pressure lower than the atmospheric pressure. In general, the pressure in the gap 130 is approximately 0.2 Pa to approximately 0.001 Pa.
The gap 130 may be filled with an inert gas such as argon at a pressure lower than the atmospheric pressure. That is, in the present application, it is assumed that the “vacuum insulated glazing” is not necessarily limited to those in which the gap is in a vacuum state and that the term “vacuum insulated glazing” means any insulated glazing in which the pressure inside the gap is less than the atmospheric pressure.
When necessary, the vacuum insulated glazing 100 may include one or two or more spacers 190 inside the gap 130. The spacers 190 serve to keep the gap 130 in a desired shape. The spacers 190, however, may be omitted if it is possible to keep the gap 130 in a desired shape without the spacers 190, for example, in the case where the degree of vacuum of the gap 130 is low or in the case where the gap 130 is filled with an inert gas or the like at a certain pressure.
The sealing member 150 is a member for keeping the gap 130 hermetically sealed. The sealing member 150 is formed entirely around the gap 130.
The sealing member 150 includes the first joining layer 160, the metal member 155, and the second joining layer 165.
The first joining layer 160 is provided in a “frame shape” in a peripheral portion of the first glass substrate 110 on the first surface 112 of the first glass substrate 110. Likewise, the second joining layer 165 is provided in a “frame shape” in a peripheral portion of the second glass substrate 120 on the second surface 122 of the second glass substrate 120.
Here, in the present application, the term “frame shape” means a generic term for shapes formed of a “frame” defined by an outer edge and an inner edge with an inside portion of a flat-plate shape being removed in a plan view. The outer edge and/or the inner edge of a member of the “frame shape” is not necessarily limited to a substantially rectangular parallelepiped shape such as a frame, and may be, for example, shapes of a polygon such as a triangle, a substantial triangle, a trapezoid, a substantial trapezoid, a pentagon, and a substantial pentagon; a circle; a substantial circle; an ellipse; and a substantial ellipse. Furthermore, the outer edge and the inner edge of a member of the “frame shape” do not always have to be similar figures, and may be, for example, totally different in shape.
The metal member 155 includes a third surface 170 and a fourth surface 172, and has a shape of the “frame shape.” Part of the third surface 170 of the metal member 155 is bonded to the first joining layer 160, and part of the fourth surface 172 of the metal member 155 is bonded to the second joining layer 165. It is possible to hermetically seal the gap 130 by placing this sealing member 150 around the gap 130.
The second joining layer 165 may be placed in an annular shape along a peripheral portion of the second surface 122 of the second glass substrate 120 as illustrated in
Here, the first joining layer 160 has a feature of being provided in a position offset from the second joining layer 165 when the vacuum insulated glazing 100 is viewed from above (in the thickness direction, the Z direction in
In the case of thus forming the sealing member 150, it is possible to reduce the effect of a difference in thermal expansion between the first glass substrate 110 and the second glass substrate 120 because of the deforming function of the metal member 155 in horizontal directions (the X direction in
A more detailed description is given below, with reference to
First, it is assumed that the temperature becomes lower on the first glass substrate 110 side than on the second glass substrate 120 side in the vacuum insulated glazing 100.
In this case, the first glass substrate 110 is subject to a stress in a direction to contract, and the second glass substrate 120 is subject to a stress in a direction to expand.
To be more specific, as illustrated in
As a result, the left end of the metal member 155 is subject to a stress in the direction of arrow F105, and the right end of the metal member 155 is subject to a stress in the direction of arrow F106. Here, it should be noted that the first joining layer 160 and the second joining layer 165 are provided in offset positions when the vacuum insulated glazing 100 is viewed from above (in the thickness direction) as described above.
The third surface 170 of the metal member 155 is not restricted by other members except for the part bonded to the first joining layer 160 (hereinafter referred to as “first bonded part (175)”), and the fourth surface 172 of the metal member 155 is not restricted by other members except for the part bonded to the second joining layer 165 (hereinafter referred to as “second bonded part (177)”). Therefore, the metal member 155 is allowed to deform in the directions of arrow F105 and arrow F106.
Such expansion of the metal member 155 in the directions of arrow F105 and arrow F106 (the X direction) allows the sealing member 150 to follow the stresses F101 and F102 working on the first glass substrate 110 and the second glass substrate 120 so as to reduce the effect due to a difference in thermal expansion between the glass substrates 110 and 120.
Next, it is assumed that the temperature becomes higher on the first glass substrate 110 side than on the second glass substrate 120 side in the vacuum insulated glazing 100.
In this case, the first glass substrate 110 is subject to a stress in a direction to expand, and the second glass substrate 120 is subject to a stress in a direction to contract.
To be more specific, as illustrated in
As a result, the left end of the metal member 155 is subject to a stress in the direction of arrow F205, and the right end of the metal member 155 is subject to a stress in the direction of arrow F206.
Here, the third surface 170 of the metal member 155 is not restricted by other members except for the first bonded part 175, and the fourth surface 172 of the metal member 155 is not restricted by other members except for the second bonded part 177. Therefore, the metal member 155 is allowed to deform in the directions of arrow F205 and arrow F206.
Such expansion of the metal member 155 in the directions of arrow F205 and arrow F206 (the X direction) allows the sealing member 150 to follow the stresses F201 and F202 working on the first glass substrate 110 and the second glass substrate 120 so as to reduce the effect due to a difference in thermal expansion between the glass substrates 110 and 120.
Thus, according to the vacuum insulated glazing 100, the deformation function of the metal member 155 included in the sealing member 150 makes it possible to significantly reduce a warp or deformation of the vacuum insulated glazing 100.
Furthermore, the sealing member 150 of the vacuum insulated glazing 100 does not include a metal member of a complicated three-dimensional shape such as a U shape. Therefore, it is possible to relatively easily produce the sealing member 150.
Furthermore, because the metal member 155 is formed to have a planar or substantially planar cross section and have a frame shape in a plan view, the processing of corners also is easy. That is, when the metal member has a U-shaped cross section, it is extremely difficult to accurately form corners. It is easily made possible for the metal member 155 having a frame shape, however, to be formed of a one-piece product without joints (seamless member) or formed by combining multiple planar members, so that there is no troubling to address corners.
Thus, the vacuum insulated glazing 100 according to the first embodiment of the present invention makes it possible to provide insulated glazing that is capable of significantly reducing the effect of deformation due to a thermal stress and has a sealing structure that is relatively easy to produce.
Next, a description is given, with reference to
As illustrated in
The second vacuum insulated glazing 200 illustrated in
To be more specific, in a cross-sectional view of the metal member 255, a third surface 270 of the metal member 255 has an outline that changes in height from substantially the same level as a first surface 212 of a first glass substrate 210 to the part bonded to a first joining layer 260, that is, a first bonded part 275. Likewise, a fourth surface 272 of the metal member 255 has an outline that changes in height from the part bonded to a second joining layer 265, that is, a second bonded part 277, to substantially the same level as a second surface 222 of a second glass substrate 220.
In the case of
Furthermore, although not clear from
The sealing member 250 including the metal member 255 of such a shape is preferable to the above-described sealing member 150 including the metal member 155. That is, in the case of the metal member 255 illustrated in
Furthermore, in the case where the first glass substrate 210 is shaped so as to lie over and cover at least part of the second joining layer 265, that is, in the case where an end of the first glass substrate 210 is positioned on top of or outside the second joining layer 265, when viewed from above (the Z direction), it is easily made possible to perform production so that the first joining layer 260 and the second joining layer 265 are equal in joining strength. It is preferable that the first and second joining layers 260 and 265 be equal in joining strength because cracks due to stress concentration or the like are less likely to occur.
As described below, when vacuum insulated glazing according to an embodiment of the present invention is produced, a first surface of a first glass substrate comes into contact with and presses the third surface of the metal member 255 to apply pressure on the second joining layer 265 and a second surface of a second glass substrate comes into contact with and presses the fourth surface of the metal member 255 to apply pressure on the first joining layer 260, with a metal member of a frame shape being interposed between the two glass substrates. As a result of both the first and second joining layers 260 and 265 being thus pressed to be bonded to the metal member 255, it is possible to substantially equalize the joining strengths with ease. With respect to the bonding of a metal member and a joining layer, for example, glass frit, pressing at the time of bonding is one major factor that affects joining strength. It is clear that the joining layer is desirably substantially uniform in its entirety, and it contributes to improvement in the maintainability and durability of sealing that the first and second joining layers 260 and 265 are equal in joining strength and do not differ greatly in joining strength at least locally.
Furthermore, because the sealing member is interposed between two glass substrates, the problem of the breakage of the sealing member during the transportation of vacuum insulated glazing is significantly controlled.
It is preferable to perform production in this manner because the metal member 255 in the sealing member 250 tends to be eventually formed like
It is clear to a person skilled in the art that it is possible for the vacuum insulated glazing 200 illustrated in
Next, a description is given, with reference to
As illustrated in
The third vacuum insulated glazing 300 illustrated in
That is, according to the second vacuum insulated glazing 200 illustrated in
In the case of
According to the vacuum insulated glazing 300 of such a configuration, the metal member 355 is less restricted by other members when contracting because of a temperature difference between the two glass substrates. For example, when the first glass substrate 310 expands relative to the second glass substrate 320 (for example, as in the case of
Next, a more detailed description is given of component members that form vacuum insulated glazing according to an embodiment of the present invention as described above. In the following description, the above-described second vacuum insulated glazing 200 is taken as an example, and its component members are described. Accordingly, the reference numerals of component members correspond to the reference numerals used in
The composition of glass that forms the glass substrates 210 and 220 is not limited in particular. The glass of the glass substrates 210 and 222 may be, for example, soda-lime glass and/or alkali-free glass.
Furthermore, the compositions of the first glass substrate 210 and the second glass substrate 220 may be either equal or different.
Spacers 290 may have the same material, shape, and/or dimensions as spacers used in conventional vacuum insulated glazing.
The joining layers 260 and 265 that are components of the sealing member 250 may be formed of any material as long as having bondability with respect to the glass substrates 210 and 220 and the metal member 255. Furthermore, the first joining layer 260 and the second joining layer 265 may be formed of either the same material or different materials.
For examples, the joining layers 260 and 265 may be solidified glass layers.
The solidified glass layers are formed by firing paste containing glass frit. The solidified glass layers include a glass component and may further include ceramic particles.
The composition of the glass component included in the solidified glass layers is not limited in particular. The glass component included in the solidified glass layers may be, for example, ZnO—Bi2O3—B2O3-based or ZnO—SnO—P2O5-based glass.
Table 1 illustrates a composition of ZnO—Bi2O3—B2O3-based glass that may be used as a glass component included in the solidified glass layers. Furthermore, Table 2 illustrates a composition of ZnO—SnO—P2O5-based glass that may be used as a glass component included in the solidified glass layers.
70-90
2-8
Alternatively, one of the joining layers 260 and 265 may include a metal sprayed surface coating.
For example, when the first joining layer 260 includes a sprayed coating, it is possible to bond the metal member 255 to the first joining layer 260 by, for example, brazing, soldering or the like in the assembly process.
Such a metal sprayed coating may be formed in a frame shape on one surface of the glass substrate by, for example, electric arc spraying or plasma spraying.
Materials of the metal sprayed coating may be, but are not limited to, for example, copper (and copper alloys), aluminum (and aluminum alloys), zinc (and zinc alloys), etc.
Thus, the joining layers 260 and 265 may include any materials, such as ceramics, glass, metal, etc., as long as being bondable to the metal member 255. Furthermore, the joining layers 260 and 265 do not necessarily have to be formed of a single layer, and may be formed of multiple layers.
The thickness of the joining layer (the thickness of the entirety when formed of multiple layers) may be in the range of, but is not limited to, for example, 10 μm to 1000 μm when the pressure in the gap is less than the atmospheric pressure, or 10 μm to 15000 μm when the gap is filled with an inert gas or the like at a certain pressure.
The metal material of the metal member 255 is not limited to a particular kind. The metal member 255 may be selected from, for example, aluminum and aluminum alloys, copper and copper alloys, titanium and titanium alloys, stainless steel, etc.
The metal member 255 is foil or plate-shaped, and may have a thickness ranging from 5 μm to 500 μm when the pressure in the gap is less than the atmospheric pressure or a thickness ranging from 5 μm to 700 μm when the gap is filled with an inert gas or the like at a certain pressure.
Furthermore, the shape of the metal member 255 is not limited in particular at an intermediate preparation stage as long as the finally provided shape is a frame shape. Accordingly, the metal member 255 of a frame shape may be formed by, for example, joining multiple elongated plate-shaped members. Alternatively, the metal member 255 of a frame shape may be cut out in a frame shape from a plate-shaped member or blanked out in a frame shape from a plate-shaped member and be provided as a one-piece product (seamless member). Furthermore, the metal member 255 may also be formed by stacking in layers and joining multiple metal members in the thickness direction of the insulated glazing.
Furthermore, the third surface 270 and/or the fourth surface 272 of the metal member 255 may be corrugated. Alternatively, the third surface 270 and/or the fourth surface 272 of the metal member 255 may be embossed. When such processing is performed on the third surface 270 and/or the fourth surface 272 of the metal member 255, the length of the actual corresponding part of the metal member 255 increases relative to its apparent length. Accordingly, it is possible to increase the “deformation allowance” of the metal member 255 at the time of deformation (contraction or expansion), thus making it possible to accommodate greater deformation. [Sealing Member 250]
As described above, the sealing member 250 is formed of the first and second joining layers 260 and 265 and the metal member 255.
A description is given below, with reference to
In the case illustrated in
Here, a minimum distance Xp in a direction parallel to the second surface 222 of the second glass substrate 220 between the outer end of the first bonded part 275 of the third surface 270 of the metal member 255 to which the first joining layer 260 is bonded and the inner end of the second bonded part 277 of the fourth surface 272 of the metal member 255 to which the second joining layer 265 is bonded is preferably in the range of 0.1 mm to 100 mm, and more preferably, in the range of 2 mm to 50 mm.
Furthermore, a minimum distance Xq between the center of the first joining layer 260 in a direction parallel to the first surface 212 (the X direction) and the center of the second joining layer 265 in a direction parallel to the second surface 222 (the X direction) is preferably in the range of 0.2 mm to 120 mm, and more preferably, in the range of 3 mm to 40 mm.
The maximum width (length in the X direction) of the first joining layer 260 and/or the second joining layer 265 may be in the range of, but is not limited to, for example, 0.1 mm to 15 mm. This width may be in the range of 1 mm to 7 mm.
A thickness (length in the Z direction) Za of the sealing member 250 is preferably in the range of 0.015 mm to 1 mm, and more preferably, in the range of 0.05 mm to 0.5 mm when the pressure in the gap is less than the atmospheric pressure, or preferably in the range of 0.015 mm to 15.7 mm, and more preferably, in the range of 3 mm to 13 mm when the gap is filled with an inert gas or the like at a certain pressure. The thickness Za of the sealing member 250 corresponds to the height of a gap 230.
In the case illustrated in
Furthermore, in the case of
Next, a description is given, with reference to
As illustrated in
A description is given in detail below of each step.
In the following description, by way of example, a description is given of a method of producing insulated glazing according to the present invention, taking the vacuum insulated glazing 200 configured as illustrated in
First, the first and second glass substrates 210 and 220 are prepared.
Furthermore, the first joining layer 260 is formed on the first glass substrate 210, and the second joining layer 265 is formed on the second glass substrate 220.
A description is given below, taking the case where the joining layer 260 is a solidified glass layer as an example, of the case of forming a first solidified glass layer in a peripheral portion of the first surface 212 of the first glass substrate 210.
In the case of forming the first solidified glass layer in a peripheral portion of the first glass substrate 210, paste for the first solidified glass layer is prepared. Normally, the paste includes glass frit, ceramic particles, a polymer, an organic binder, etc. The ceramic particles, however, may be omitted. The glass frit ends up in a glass component that is a component of the first solidified glass layer.
The prepared paste is applied on a peripheral portion of the first surface 212 of the first glass substrate 210.
Next, the first glass substrate 210 including the paste is dried. The conditions of the drying are not limited in particular as long as the organic binder in the paste is removed under the conditions. The drying may be performed by retaining the first glass substrate 210 at a temperature of 100° C. to 200° C. for approximately 30 minutes to approximately 1 hour.
Next, the first glass substrate 210 is subjected to heat treatment at high temperatures for preliminary firing of the paste. The conditions of the heat treatment are not limited in particular as long as the polymer included in the paste is removed under the conditions. The heat treatment may be performed by retaining the first glass substrate 210 in the temperature range of, for example, 300° C. to 470° C. for approximately 30 minutes to approximately 1 hour. As a result, the paste is fired, so that the first solidified glass layer is formed.
Likewise, a second solidified glass layer is formed in a peripheral portion of the second surface 222 of the second glass substrate 220. Here, it should be noted that the second solidified glass layer is formed so that the position in which the second solidified glass layer is formed is offset from the position in which the first solidified glass layer is formed in a view from above (the Z direction) when the two glass substrates 210 and 220 are stacked in layers.
Next, the metal member 255 of a frame shape is prepared.
As described above, the metal member 255 of a frame shape may be a one-piece product (seamless member) without joints or be formed by combining multiple members.
It is possible to easily produce the frame-shaped metal member 255 of a one-piece product (seamless member) by, for example, preparing a plate-shaped metal member and performing press cutting so as to cut off an inside portion of this plate-shaped metal member.
Next, an assembly is formed by combining the first and second glass substrates 210 and 220 and the metal member 255 of a frame shape.
At this point, the metal member 255 is stacked on the first and second glass substrates 210 and 220 so that part of the third surface 270 comes into contact with the first solidified glass layer and part of the fourth surface 272 comes into contact with the second solidified glass layer.
Furthermore, at this point, one or two or more spacers 290 may be placed between the first glass substrate 210 and the second glass substrate 220 as required.
A pressure may be applied to the assembly from the first glass substrate 210 and/or second glass substrate 220 side as required.
Next, the assembly is fired. The firing temperature and the firing time vary depending on the softening point of a solidified glass layer, etc. For example, after being retained for approximately 5 seconds to approximately 180 minutes, preferably, approximately 15 seconds to approximately 30 minutes (for example, 20 minutes) in a chamber at a temperature of approximately 350° C. to approximately 600° C., preferably, 470° C. to 560° C. (for example, 490° C.), the assembly may be extracted from the chamber and cooled to room temperature. The firing may be performed by heating not the entire assembly but at least part of the first and second solidified glass layers 260 and 265.
Furthermore, the first and second solidified glass layers may be pressed by pressing the third surface of the metal member and the fourth surface of the metal member during the firing of the assembly. By thus pressing the solidified glass layers, the strength of bonding to the metal member is increased. Furthermore, when the first glass substrate 210 is shaped so as to lie over and cover at least part of the second solidified glass layer 265 in a view from above (the Z direction) as illustrated in
Furthermore, the step of firing the assembly may be performed while applying a pressure of 25 kg/m2 to 1000 kg/m2 on the assembly, and is performed by, for example, applying a load onto the first glass substrate 210 with the assembly being fixed. Alternatively, the step of firing the assembly may be performed by holding the first glass substrate 210 and the second glass substrate 220 together with clamping means. By thus applying a load onto the assembly, it is possible to easily press the solidified glass layers with the first glass substrate 210 and the second glass substrate 220.
An increase in the temperature of the assembly softens the first and second solidified glass layers. As a result, the third surface 270 of the metal member 255 is bonded to the first solidified glass layer in the first bonded part 275, and the fourth surface 272 of the metal member 255 is bonded to the second solidified glass layer in the second bonded part 277. Accordingly, after the firing of the assembly, the gap 230 surrounded by the sealing member 250 is formed between the first and second glass substrates 210 and 220.
Thereafter, the gap 230 is depressurized using openings provided beforehand in the first glass substrate 210 and/or the second glass substrate 220. For example, the gas inside the gap 230 is replaced with an inert gas or the gap 230 is depressurized. Furthermore, the openings used for the depressurizing are sealed. As a result, the second vacuum insulated glazing 200 is produced.
The assembly may be fired in a reduced-pressure environment. That is, the firing is performed with the assembly being placed in a chamber in which the pressure is less than the atmospheric pressure. When the assembly is fired in a reduced-pressure environment, a vacuum is maintained in the gap 230 during the firing, so that the reduction of pressure is completed at the same time with the processing of the sealing member. Furthermore, there is no need to perforate the glass substrates, and there is no need for the pressure reduction process after firing.
In addition to the overall heating process, methods that locally heat the first and second solidified glass layers (such as infrared heating, electromagnetic heating, and laser emission) may be employed as methods of firing the assembly.
By the above-described process, it is possible to produce the vacuum insulated glazing 200 configured as illustrated in
In the above description, a method of producing insulated glazing according to an embodiment of the present invention is described, taking the vacuum insulated glazing 200 configured as illustrated in
It is clear to a person of ordinary skill in the art, however, that the above-described production method may also be applied, directly or with a slight change, to, for example, vacuum insulated glazing of another configuration (for example, the vacuum insulated glazing 300), “non-vacuum” insulated glazing, etc., in the same manner.
For example, as described above, the first joining layer 260 or the second joining layer 265 may be formed of a metal sprayed coating instead of a solidified glass layer. In this case, the metal member 255 is bonded to the joining layers formed of a metal sprayed coating by, for example, brazing or soldering at the stage of forming an assembly. Accordingly, the stability of the assembly is improved to control problems such as misalignment, so that it is possible to improve subsequent handleability of the assembly.
The present invention may be used for vacuum insulated glazing and the like used for window glass of constructions.
All examples and conditional language provided herein are intended for pedagogical purposes of aiding the reader in understanding the invention and the concepts contributed by the inventors to further the art, and are not to be construed as limitations to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority or inferiority of the invention. Insulated glazing and a method of producing insulated glazing have been described above based on one or more embodiments. It should be understood, however, that the invention is not limited to the specifically disclosed embodiments, and various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012-228423 | Oct 2012 | JP | national |
The present application is a continuation application filed under 35 U.S.C. 111(a) claiming benefit under 35 U.S.C. 120 and 365(c) of PCT International Application No. PCT/JP2013/077916, filed on Oct. 15, 2013 and designating the U.S., which claims priority to Japanese Patent Application No. 2012-228423, filed on Oct. 15, 2012. The entire contents of the foregoing applications are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/JP2013/077916 | Oct 2013 | US |
| Child | 14686995 | US |
