JP2016153364A - Multiple glass and method for manufacturing multiple glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple glass that has an easily produced seal structure and prevents the seal structure from being damaged even when affected by deformation due to a thermal stress in a glass plate.SOLUTION: A multiple glass 100 includes a clearance 130 between a first surface 112 of a first glass substrate 110 and a second surface 122 of a second glass substrate 120 which face each other. The clearance is sealed by a seal member 150. The seal member includes a metal member 155, a first bonding layer 160, and a second bonding layer 165. The second glass substrate includes a first area 126 that is laminated with a functional film, other than an area where the second glass substrate and the seal member overlap with each other, and a second area 128 that is not laminated with the functional film in the area where the second glass substrate and the seal member overlap with each other. The second bonding layer is arranged in the second area. The first and second bonding layers do not overlap with each other. The second bonding layer is arranged inside the first bonding layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multilayer glass and a method for producing a multilayer glass.

In recent years, multi-layer glass having excellent heat insulation performance has been used for window glass and the like.
Since the double-glazed glass is formed by laminating a pair of glass substrates via a gap, it is known to install a seal member around the gap to hold the gap of the double-glazed glass. .

  Recently, a seal member composed of a metal member and a bonding layer has been developed. For example, Patent Document 1 discloses a first glass substrate, a second glass substrate, a gap portion formed through a spacer between the two glass substrates, and a seal structure formed around the gap portion. A double glazing comprising is shown. And the structure provided with the 1st joining layer formed in the 1st glass substrate, the metal member, and the 2nd joining layer formed in the 2nd glass substrate is disclosed for the sealing structure.

On the other hand, in order to improve heat insulation performance, Patent Document 2 discloses a multilayer glass provided with a heat ray reflective film (heat shielding film) called a Low-E film.
Since the Low-E film generally has low moisture resistance, it is preferable to dispose the Low-E film in a space (gap side) sealed with a glass plate.

International Publication No. 2014/061639 Pamphlet International Publication No. 2014/061613 Pamphlet

  However, when the Low-E film is provided on the second glass substrate of the multilayer glass disclosed in Patent Document 1 which is the conventional technique, and the second bonding layer is formed on the Low-E film, the first When a temperature difference occurs between the glass substrate and the second glass substrate and the glass substrate is affected by the deformation of the glass substrate due to thermal stress, the second bonding layer formed on the Low-E film and the Low-E film There was a problem that they peeled off together and the seal structure was damaged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-layer glass having a seal structure that is relatively easy to manufacture without damage to the seal structure even under the influence of deformation due to thermal stress of the glass plate. Another object of the present invention is to provide a method for producing a multi-layer glass having a seal structure that is relatively easy to manufacture without being damaged even under the influence of deformation due to thermal stress of the glass plate. And

In order to achieve the above object, the multilayer glass according to the present invention is:
A multilayer glass having a gap between the first surface of the first glass substrate and the second surface of the second glass substrate facing each other,
The gap is sealed by a sealing member around the multilayer glass,
When the second glass substrate is viewed from the thickness direction of the multilayer glass, the first region where the functional film is laminated in addition to the region where the second glass substrate and the seal member overlap A second region in which a functional film is not laminated in a region where the second glass substrate and the seal member overlap,
The seal member includes a metal member having an annular shape around the multilayer glass when the multilayer glass is viewed from the thickness direction, and a first annular shape along the periphery of the first glass substrate. And a second bonding layer having an annular shape around the periphery of the second glass substrate,
The second bonding layer is disposed in the second region, and the first bonding layer and the second bonding layer do not overlap when viewed from the thickness direction of the multilayer glass. And the said 2nd joining layer is provided with the multilayer glass arrange | positioned inside the said 1st joining layer.

  In the double-glazed glass according to the present invention, the gap portion may be configured to be in a pressure state less than atmospheric pressure.

  In the multilayer glass according to the present invention, the functional film may be a heat ray reflective film.

  Further, in the multilayer glass according to the present invention, the second region may be formed by physical etching.

  Moreover, the multilayer glass by this invention WHEREIN: As for the said metal member, the uneven | corrugated surface of the island-shaped pattern containing several concave or convex island parts may be formed.

  Further, in the multilayer glass according to the present invention, the metal member has a first contact region in contact with the first bonding layer, and a second contact region in contact with the second bonding layer, In the first contact region and the second contact region of the metal member, an uneven surface having an island pattern including a plurality of concave or convex island portions may be formed.

  Moreover, the multilayer glass by this invention WHEREIN: The said 1st joining layer and / or 2nd joining layer may have a glass solidification layer.

  Moreover, in the multilayer glass according to the present invention, the sealing member is disposed on the inner side of the end surface of the first glass substrate or the second glass substrate when the multilayer glass is viewed from the thickness direction. May be.

  Moreover, the multilayer glass by this invention WHEREIN: The said metal member may be comprised with the integral product which does not have a junction part.

  In the multilayer glass according to the present invention, the metal member has a shape in which the height of the third surface changes from one end portion to the other end portion when viewed from the cross-sectional direction. May be.

  In the multilayer glass according to the present invention, the metal member has a third surface and a fourth surface that are front and back surfaces, and the first contact region and the second contact region are both It may be arranged on the third surface side.

  Moreover, in the multilayer glass according to the present invention, the metal member has a third surface and a fourth surface as front and back surfaces, and the first contact region and the second contact region are You may arrange | position to the 3rd surface and the said 4th surface side.

Furthermore, in the present invention, there is provided a method for producing a multilayer glass having a gap between the first surface of the first glass substrate and the second surface of the second glass substrate facing each other,
When viewed from the thickness direction of the multilayer glass, a first region where a functional film is laminated other than a region where the second glass substrate and the seal member overlap is formed, and the second glass Forming a second region in which a functional film is not laminated in a region where the substrate and the sealing member overlap;
A first bonding layer having an annular shape around the periphery of the first glass substrate is formed, and the first bonding layer is the second region when viewed from the thickness direction of the multilayer glass. Forming a second bonding layer having an annular shape along the periphery of the second glass substrate so as not to overlap with the layer and to be disposed inside the first bonding layer;
Providing an annular metal member having an annular shape around the periphery of the first glass substrate or the second glass substrate;
The first glass layer and the second glass substrate are combined with the first glass substrate and the second glass layer in such a manner that the first bonding layer and the second bonding layer are in contact with the first contact region and the second contact region of the metal member, respectively. Laminating glass substrates to form an assembly;
A step of heating at least the first bonding layer and the second bonding layer of the assembly to bond the first bonding layer and the second bonding layer to the metal member; A method for producing glass is provided.

  Here, in the method for producing a multilayer glass according to the present invention, the bonding step includes the step of heating the first bonding layer and the second bonding layer while applying pressure in the thickness direction of the assembly. You may have.

  In the method for producing a multilayer glass according to the present invention, the first bonding layer and / or the second bonding layer may have a glass solidified layer.

  In the present invention, it is possible to provide a multi-layer glass having a seal structure that is relatively easy to manufacture without being damaged even under the influence of deformation of the glass plate due to thermal stress. Moreover, in this invention, even if it receives to the influence of the deformation | transformation by the thermal stress of a glass plate, a sealing structure is not damaged and can provide the manufacturing method of a double glazing provided with the sealing structure which is comparatively easy to manufacture. .

It is sectional drawing of the vacuum multilayer glass by one Embodiment of this invention. It is a partial expanded sectional view of the seal | sticker part of the vacuum multilayer glass of a prior art. It is a partial expanded sectional view of the seal | sticker part of the vacuum multilayer glass of a prior art. It is a partial expanded sectional view of a seal part of vacuum double glazing by one embodiment of the present invention. It is a partial expanded sectional view of a seal part of vacuum double glazing by one embodiment of the present invention. It is the flowchart which showed roughly an example of the manufacturing method of the vacuum double layer glass by one Embodiment of this invention. The temperature near the center of the first outer surface of the first glass substrate in the hot-air cycle test 1 when a vacuum double-layer glass having an intentionally unhealthy seal structure is used, and the second glass substrate It is a graph which shows the temperature change of the temperature of the vicinity of the center of 2 outer surfaces.

  Embodiments of the present invention will be described below with reference to the drawings.

(Vacuum double-layer glass according to an embodiment of the present invention)
Hereinafter, with reference to FIG. 1, the multilayer glass by one Embodiment of this invention is demonstrated.
In the following description, “vacuum double-glazed glass” will be described as an example of double-glazed glass, and the configuration and characteristics thereof will be described. However, it is obvious to those skilled in the art that the present invention is not limited to “vacuum double-glazed glass”, and can be similarly provided to “non-vacuum” double-glazed glass.

In FIG. 1, an example of a structure of vacuum double layer glass is shown roughly.
As shown in FIG. 1, the vacuum multi-layer glass 100 according to an embodiment of the present invention includes a first glass substrate 110, a second glass substrate 120, and a gap formed between the two glass substrates 110 and 120. Part 130, a plurality of spacers 190 for holding gap part 130, and a seal member 150 for holding gap part 130 in a sealed state. The seal structure 150 is configured by laminating a first connection layer 160, a metal member 155, and a second connection layer 165 in this order.

  The first glass substrate 110 has a first surface 112. In the vacuum double-glazed glass 100, the first glass substrate 110 is disposed so that the first surface 112 side is the inside. Similarly, the second glass substrate 120 has a second surface 122. In the vacuum double-glazed glass 100, the second glass substrate 120 is disposed so that the second surface 122 side is the inside. 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.

  In the normal case, the gap 130 is maintained in a vacuum state. Here, the degree of vacuum of the gap 130 is not particularly limited, and may be any pressure lower than atmospheric pressure. In general, the pressure in the gap 130 is about 0.2 Pa to 0.001 Pa.

  Note that the gap 130 may be filled with an inert gas such as argon at a pressure lower than atmospheric pressure. That is, in the present application, the “vacuum multilayer glass” is not limited to the one in which the pressure in the gap is in a vacuum state, and the term “vacuum multilayer glass” means that the pressure in the gap is less than atmospheric pressure. It shall mean all double-glazed glass.

  If necessary, the vacuum multilayer glass 100 may have one or more spacers 190 in the gap 130. The spacer 190 has a role of holding the gap 130 in a desired shape. However, when the gap 130 can be maintained in a desired shape without the spacer 190, for example, when the degree of vacuum of the gap 130 is low, or when an inert gas or the like is applied to the gap 130 at a certain pressure. In the case of filling, the spacer 190 may be omitted.

  In the second glass substrate 120, when the vacuum multilayer glass 100 is viewed from the thickness direction, the functional film 180 is laminated in a region other than the region where the second glass substrate 120 and the seal member 150 overlap. It has the area | region 126 and the 2nd area | region 128 with which the functional film is not laminated | stacked in the area | region where the 2nd glass substrate 120 and the sealing member 150 overlap.

  The seal member 150 is a member for holding the gap 130 in a sealed state, and the seal member 150 is configured over the entire periphery of the gap 130.

  The seal member 150 includes a first bonding layer 160, a metal member 155, and a second bonding layer 165.

  The first bonding layer 160 is installed in a “frame shape” around the first glass substrate 110 on the first surface 112 side of the first glass substrate 110. Similarly, the second bonding layer 165 is provided in a “frame shape” over the periphery of the second glass substrate 120 on the first surface 122 side of the second glass substrate 120.

  Here, in the present application, the term “frame shape” means a general term for a shape constituted by a “frame” having an outer outline and an inner outline, with the inside of a flat plate shape removed in plan view. However, the outer contour and / or inner contour of the “frame-shaped” member is not necessarily limited to a substantially rectangular parallelepiped shape such as a forehead, and may be, for example, a substantially trapezoidal shape, a substantially circular shape, or a substantially elliptical shape. . Further, the outer and inner contours of the “frame-shaped” member do not necessarily have similar shapes, and may be completely different, for example.

  The seal member 150 is disposed inside the end surface of the first glass substrate or the second glass substrate when the vacuum multilayer glass 100 is viewed from the thickness direction. Since such a sealing member is a structure which tends to narrow the light transmission area | region of a vacuum multilayer glass, it is a structure with the big effect by this invention.

  The metal member 155 has a third surface 170 and a fourth surface 172, and has a “frame shape” shape. The third surface 170 of the metal member 155 is partially bonded to the first bonding layer 160, and the fourth surface 172 of the metal member 155 is partially bonded to the second bonding layer 165. Yes. That is, the first bonding layer 160 is bonded to the third surface 170 of the metal member 155, and the second bonding layer 165 is bonded to the fourth surface 172 of the metal member 155. Hereinafter, the region in contact with the first bonding layer 160 of the metal member 155 is referred to as a first contact region 175, and the region in contact with the second bonding layer 165 of the metal member 155 is referred to as the second contact region 175. This is referred to as a contact area 177. By disposing such a seal member 150 around the gap portion 130, the gap portion 130 can be sealed.

  As shown in FIG. 1, when the vacuum multilayer glass 100 is viewed from above (thickness direction: Z direction in FIG. 1), the first bonding layer 160 and the second bonding layer 165 do not overlap. The second connection layer 165 is preferably formed on the inner side of the first bonding layer 160.

  When the sealing member 150 is configured in this way, even when a temperature difference occurs between the first glass substrate 110 and the second glass substrate 120, the metal member 155 is the first surface of the first glass substrate. 112 and the second glass substrate 120 have a deformation function in a horizontal direction (X direction in FIG. 1) parallel to the second surface 122 of the second glass substrate 120, and therefore, between the first glass substrate 110 and the second glass substrate 120. It becomes possible to reduce the influence of the difference in thermal expansion.

  Hereinafter, a detailed description will be given with reference to FIGS. 2, 3, 4, and 5.

  2 and 3 schematically show partial enlarged cross-sectional views of the sealing member 250 of the vacuum multilayer glass 200 according to the prior art.

  In the vacuum double-glazed glass 200 shown in FIGS. 2 and 3, the left side (−X direction side) of the seal member 250 is atmospheric pressure, and the gap 230 is vacuum.

  First, it is assumed that the vacuum glass 200 has a lower temperature on the first glass substrate 210 side than on the second glass substrate 220 side.

  In this case, the first glass substrate 210 receives stress in the contracting direction, and the second glass substrate 220 receives stress in the expanding direction. More specifically, as shown in FIG. 2, the first glass substrate 210 tends to deform in the direction of arrow F101, and the second glass substrate 220 tends to deform in the direction of arrow F201.

  At this time, the fourth surface 272 of the metal member 255 receives the stress in the direction pushed by the atmospheric pressure, that is, in the direction of the arrow F302, and comes into contact with the second region 226. Since the first glass substrate 210 tends to deform in the direction of the arrow F101 and the second glass substrate 220 tries to deform in the direction of the arrow F201, the portion that contacts the second region 226 of the metal member 255 is Receive friction.

  Next, it is assumed that in the vacuum multilayer glass 200, the temperature of the first glass substrate 210 side is higher than that of the second glass substrate 220 side.

  In this case, the first glass substrate 210 receives stress in the expanding direction, and the second glass substrate 220 receives stress in the contracting direction. More specifically, as shown in FIG. 3, the first glass substrate 210 tends to deform in the direction of arrow F102, and the second glass substrate 220 tends to deform in the direction of arrow F202.

  At this time, the fourth surface 272 of the metal member 255 receives the stress in the direction pushed by the atmospheric pressure, that is, the direction of the arrow F302, and contacts the second region 226, as in FIG. Since the first glass substrate 210 tends to deform in the direction of the arrow F102 and the second glass substrate 220 tends to deform in the direction of the arrow F202, the portion that contacts the second region 226 of the metal member 255 is Receive friction.

  Here, as a method of forming the second region 226 of the second glass substrate 220, for example, the functional film 280 is laminated on the entire surface of the second surface 222 of the second glass substrate 220, and then the second glass substrate 220. A method of performing physical etching in a “frame shape” around the periphery of the film can be employed. In this case, since the part where the second region 226 is formed is a part that is housed in the window frame (sash) of the window glass, the surface of the second region 226 is, for example, the first of the first glass substrate 210. It is not necessary that the surface roughness be equal to the surface 212 of the surface. Therefore, the surface may be rougher than the first surface 212 of the first glass substrate 210.

  Therefore, when the metal member 255 is made of a thin aluminum foil or the like, the second region 226 of the second glass substrate 220 whose surface is rough and the portion in contact with the second region 226 of the metal member 255 are in contact with each other. Due to the friction, the metal member 255 buckles and breaks.

  Next, the sealing member 150 of the vacuum multilayer glass 100 which is one embodiment of the present invention will be described.

  4 and 5 schematically show partial enlarged sectional views of the sealing member 150 of the vacuum double-glazed glass 100 according to one embodiment of the present invention.

  First, it is assumed that the vacuum glass 100 has a lower temperature on the first glass substrate 110 side than on the second glass substrate 120 side.

  In this case, the first glass substrate 110 receives stress in the contracting direction, and the second glass substrate 120 receives stress in the expanding direction. More specifically, as shown in FIG. 4, the first glass substrate 110 tends to deform in the direction of arrow F101, and the second glass substrate 120 tends to deform in the direction of arrow F201.

  At this time, the third surface 170 of the metal member 155 receives stress in the direction pushed by atmospheric pressure, that is, in the direction of the arrow F301, and comes into contact with the first surface 112 of the first glass substrate 110. The first glass substrate 110 tends to deform in the direction of arrow F101, and the second glass substrate 120 tends to deform in the direction of arrow F201. Therefore, the third surface 170 of the metal member 155 and the first glass A portion of the substrate 110 that contacts the first surface 112 is subjected to friction.

  Next, it is assumed that in the vacuum multilayer glass 100, the temperature of the first glass substrate 110 side is higher than that of the second glass substrate 120 side.

  In this case, the first glass substrate 110 receives stress in the expanding direction, and the second glass substrate 120 receives stress in the contracting direction. More specifically, as shown in FIG. 5, the first glass substrate 110 tends to deform in the direction of arrow F102, and the second glass substrate 120 tends to deform in the direction of arrow F202.

  At this time, the third surface 170 of the metal member 155 receives stress in the direction pushed by atmospheric pressure, that is, in the direction of the arrow F301, and comes into contact with the first surface 112 of the first glass substrate 110. Since the first glass substrate 110 tends to deform in the direction of arrow F102 and the second glass substrate 120 tends to deform in the direction of arrow F202, the third surface 170 of the metal member 155 and the first glass A portion of the substrate 110 that contacts the first surface 112 is subjected to friction.

  Here, since the surface of the first surface 112 of the first glass substrate 110 is smoother than that of the second region 128 of the second glass substrate 120, the first surface 112 of the first glass substrate 110 and the first surface 170 of the metal member 155 are the same. Even if the portion of the glass substrate 110 that contacts the first surface 112 is subjected to friction, the metal member 155 is unlikely to buckle and break.

  Therefore, when the vacuum double-glazed glass 100 is viewed from above (thickness direction: Z direction in FIG. 1), the first bonding layer 160 and the second bonding layer 165 do not overlap with each other, and the second connection When the layer 165 is formed on the inner side of the first bonding layer 160, a temperature difference is generated between the first glass substrate 110 and the second glass substrate 120, and the third surface of the metal member 155. Even if 170 is pushed to the atmospheric pressure and comes into contact with the first surface 112 of the first glass substrate 110, the metal member 155 is preferable because it is difficult to buckle and break.

  When manufacturing the vacuum multilayer glass 100 having such a configuration, for example, an assembly in which each member constituting the sealing member 150 is arranged between the first glass substrate 110 and the second glass substrate 120. Is configured. The assembly is then heat treated. By the heat treatment, the first and second bonding layers 160 and 165 are melted (softened) and solidified to form the seal member 150. Further, both glass substrates 110 and 120 are joined through the seal member 150, and the vacuum double-glazed glass 100 is manufactured.

  Here, in the vacuum double-glazed glass 100 of one embodiment of the present invention, the first contact region 175 and the second contact region 177 of the metal member 155 have an island shape having a plurality of concave or convex island portions. An uneven surface of the pattern may be formed. Such a concavo-convex surface is preferable because it can suppress spreading and spreading when the first and second bonding layers 160 and 165 are softened.

  In forming the first and second bonding layers 160 and 165, it is necessary to heat the seal member 150 partially or the entire assembly during the heat treatment. In order to obtain a bonding layer that provides reliable sealing, it is desirable to apply pressure in the thickness direction (Z direction in FIG. 1) of the vacuum double-glazed glass during the heat treatment. However, the first and second bonding layers pressed at the time of softening are not in the longitudinal direction of the metal member 155 (the direction along the periphery of the vacuum double-glazed glass; the direction toward the paper surface of FIG. 1) but in the width direction (vacuum compound). It is easy to spread in the direction perpendicular to the direction along the periphery of the layer glass (X direction in FIG. 2). By providing the first contact region 175 and the second contact region 177 of the metal member 155 with such an uneven surface having an island pattern, the first and second bonding layers 160 and 165 are heated by the heat treatment of the seal member. When the material melts (softens), the first and second bonding layers 160 and 165 are significantly suppressed from spreading beyond a predetermined range in the width direction of the metal member 155 (X direction in FIG. 1). Can do.

  Thereby, in the 1st vacuum multilayer glass 100, it becomes possible to shorten the seal width (code | symbol W of FIG. 1) of the sealing member 150 significantly. Thereby, in the 1st vacuum multilayer glass 100, it becomes possible to suppress significantly the narrowing of the translucent area | region of the 1st vacuum multilayer glass 100 by the sealing member 150. FIG.

  The uneven surface of the island pattern may or may not be formed in the first contact region 175 and the second contact region 177 of the metal member 155. When the uneven surface of the island pattern is formed, the island pattern does not necessarily have to be formed in a region away from the first contact region 175 and the second contact region 177.

  The island pattern may be configured by regularly arranging a plurality of islands, or may be configured by irregularly arranging a plurality of islands.

  The island pattern may be configured by two-dimensionally arranging a plurality of island portions having substantially the same shape, or may be configured by two-dimensionally arranging a plurality of island portions having different shapes.

  Further, the island pattern may have a circular shape when viewed from the thickness direction (Z direction in FIG. 1) of the vacuum double-glazed glass, and may be an ellipse, a triangle, a quadrangle, or a pentagon or more. You may have shapes, such as a square. Similarly, the cross section of each island part may have a shape such as a triangle, a square, or a rectangle in addition to a trapezoid.

(Constituent members of vacuum double-glazed glass)
Next, each component which comprises the vacuum multilayer glass by one Embodiment of this invention demonstrated above is demonstrated in detail. In the following description, the constituent members will be described by taking the first vacuum double-glazed glass 100 as an example. Therefore, the reference numerals of the respective members correspond to the reference numerals used in FIG.

(Glass substrate 110, 120)
The composition of the glass constituting the first glass substrate 110 and the second glass substrate 120 is not particularly limited. The glass of the glass substrates 110 and 120 may be, for example, soda lime glass and / or alkali-free glass. The compositions of the first glass substrate 110 and the second glass substrate 120 may be the same or different.

  The second glass substrate 120 is on the second surface 122, and when viewed from the thickness direction of the vacuum multilayer glass 100 (Z direction in FIG. 1), the second glass substrate 120, the sealing member 150, The first region 126 in which the functional film 180 is stacked other than the region where the functional films 180 overlap, and the second region 128 in which the functional film 180 is not stacked in the region where the second glass substrate 120 and the seal member 150 overlap. And have.

The functional film 180 may be a heat ray reflective film (also referred to as a Low-E film, a heat ray shielding film, or a low radiation film). When the functional film 180 is a heat ray reflective film, the structure of the heat ray reflective film is not particularly limited as long as it has a function of reflecting (shielding) heat rays. For example, titanium nitride (TiN) A laminate of transparent dielectric films made of metallic zinc, such as an absorption layer made of silicon, a transparent dielectric film made of silicon nitride (Si ₃ N ₄ ), an Ag main component film, or the like, may be used.

  The thickness of the functional film 180 is not particularly limited, and can be selected depending on required heat insulation performance (heat ray reflection performance), film configuration, and the like.

  The second glass substrate 120 preferably has an annular shape, and a second region 128 in which the functional film 180 is not formed is formed. As a method for forming the second region 128, for example, after the functional film 180 is laminated on the entire surface of the second surface 122 of the second glass substrate 120, a “frame shape” is formed along the periphery of the second glass substrate 120. A method for removing the functional film 180 can be employed. Examples of the method for removing the functional film 180 include physical etching (mechanical etching) such as removing the functional film 180 with a rotating grindstone, chemical etching, and the like, but the functional film 180 on the second glass substrate 120 can be removed. The method is not limited to these.

(Spacer 190)
The spacer 190 may have the same material, shape, and / or dimensions as the spacer used in conventional vacuum double glazing.

  The height of the spacer 190, that is, the thickness of the gap 130 is preferably in the range of 0.015 mm to 1 mm, and preferably 0.05 mm to 0 mm when the gap 130 is in a pressure state lower than atmospheric pressure. More preferably, it is in the range of 5 mm. When the gap 130 is filled with an inert gas or the like at a certain pressure, the thickness of the gap 130 is preferably in the range of 0.015 mm to 15.7 mm, and in the range of 3 mm to 13 mm. It is more preferable that

(Seal member 150)
As described above, the seal member 150 includes the first and second bonding layers 160 and 165 and the metal member 155. The seal width W of the seal member 150 is not particularly limited. However, it should be noted that in one embodiment of the present invention, as described above, the seal width W of the seal member 150 can be significantly shortened. The seal width W of the seal member 150 is, for example, in the range of 3 mm to 50 mm.

(Junction layers 160 and 165)
The bonding layers 160 and 165 constituting the seal member 150 may be made of any material as long as the bonding layers 160 and 165 have bonding properties to the glass substrates 110 and 120 and the metal member 155. Further, the first bonding layer 160 and the second bonding layer 165 may be the same or different.

  For example, the bonding layers 160 and 165 may be vitrified layers. The vitrified layer is formed by firing a paste containing glass frit. The vitrified layer contains a glass component, but may further contain ceramic particles.

The composition of the glass component contained in the vitrified layer is not particularly limited. The glass component contained in the vitrified layer may be, for example, ZnO—Bi ₂ O ₃ —B ₂ O ₃ based glass or ZnO—SnO—P ₂ O ₅ based glass.

Table 1 shows an example of the composition of ZnO—Bi ₂ O ₃ —B ₂ O ₃ based glass that can be used for the glass component contained in the vitrified layer. Table 2 shows an example of the composition of ZnO—SnO—P ₂ O ₅ based glass that can be used for the glass component contained in the vitrified layer.

  Alternatively, at least one of the bonding layers 160 or 165 may include a metal spray film on the surface. For example, when the first bonding layer 160 has a metal spray film, the metal spray film is formed on the surface of the first glass substrate, and the first bonding is performed on the metal spray film by, for example, brazing or soldering. Layer 160 may be formed.

  The metal sprayed film may be formed in an annular shape on one surface of the glass substrate by, for example, an arc spraying method or a plasma spraying method. The material of the metal sprayed film is not limited to this, but may be, for example, copper (and copper alloy), aluminum (and aluminum alloy), zinc (and zinc alloy), and the like.

  As described above, the bonding layers 160 and 165 may include any material such as ceramics, glass, and metal as long as they can be bonded to the metal member 155. In addition, the bonding layers 160 and 165 are not necessarily formed of a single layer, and may be formed of a plurality of layers.

  The thickness of the bonding layer is not limited to this. For example, when the gap 130 is in a pressure state lower than atmospheric pressure, a range of 10 μm to 1000 μm and a certain amount of inert gas or the like is present in the gap 130. In the case of filling at a pressure of 10 μm to 15000 μm, it may be in the range.

  Further, the maximum width (length in the X direction) of the first bonding layer 160 and / or the second bonding layer 165 is not limited to this, but is, for example, in the range of 0.1 mm to 15 mm. This width may be in the range of 1 mm to 7 mm.

  Furthermore, in the example of FIG. 1, the cross sections of the first bonding layer 160 and the second bonding layer 165 are both shown in a substantially rectangular shape. However, this is merely an example, and the cross-sections of the first bonding layer 160 and the second bonding layer 165 have, for example, a substantially rectangular shape with rounded corners, a substantially elliptical shape, a substantially trapezoidal shape, and the like. You may have the shape of. In addition, the shapes of the first bonding layer 160 and the second bonding layer 165 may be different.

(Metal member 155)
The kind of metal material that constitutes the metal member 155 is not particularly limited. The metal member 155 may be selected from, for example, aluminum and aluminum alloy, copper and copper alloy, titanium and titanium alloy, and stainless steel.

  In addition, at least the first and second contact regions 175 and 177 of the metal member 155 may have an uneven surface with an island pattern. When the metal member 155 has an uneven surface with an island pattern, it is preferable that the metal member 155 is made of a relatively soft material. Thereby, it becomes easy to form an island pattern.

  The width (the length in the X direction in FIG. 1) of the region where the metal member 155 and the first bonding layer 160 contact and the region where the metal member 155 and the second bonding layer 165 contact each other is substantially It is equal to the width of the first and second bonding layers 160 and 165. That is, the width of the region where the metal member 155 and the first bonding layer 160 are in contact and the width of the region where the metal member 155 and the second bonding layer 165 are in contact may be, for example, in the range of 0.1 mm or more and 15 mm or less. .

  The metal member 155 is a foil or a plate, and when the gap 130 is in a pressure state less than atmospheric pressure, the metal member 155 has a thickness in the range of 5 μm to 500 μm, preferably in the range of 50 μm to 200 μm. When the gap 130 is filled with an inert gas or the like at a certain pressure, it has a thickness in the range of 5 μm to 700 μm, preferably in the range of 50 μm to 500 μm. May be.

  Further, the shape of the metal member 155 in the preparatory stage is not particularly limited as long as the final provided shape is an annular shape along the periphery of the vacuum multilayer glass. Therefore, for example, the annular metal member 155 may be configured by joining a plurality of elongated plate-like members. Alternatively, the annular metal member 155 may be provided as an integrated product (seamless member) by cutting the plate-like member into an annular shape or punching the plate-like member into an annular shape. Further, the metal member 155 may be configured by laminating and bonding a plurality of metal members in the thickness direction of the vacuum multilayer glass.

(Method for producing vacuum double-glazed glass according to one embodiment of the present invention)
Next, an example of the manufacturing method of the vacuum double layer glass by one Embodiment of this invention is demonstrated.

FIG. 6 shows a flowchart of an example of a method for producing a vacuum double-glazed glass according to an embodiment of the present invention. As shown in FIG. 6, the manufacturing method of the vacuum double-glazed glass according to one embodiment of the present invention is as follows.
When viewed from the thickness direction of the multilayer glass, a first region where a functional film is laminated other than a region where the second glass substrate and the seal member overlap is formed, and the second glass Forming a second region in which the functional film is not laminated in a region where the substrate and the sealing member overlap (S110);
A first bonding layer having an annular shape around the periphery of the first glass substrate is formed, and the first bonding layer is the second region when viewed from the thickness direction of the multilayer glass. Forming a second bonding layer having an annular shape along the periphery of the second glass substrate so as not to overlap with the layer and to be disposed inside the first bonding layer (S120);
Preparing an annular metal member having an annular shape around the periphery of the first glass substrate or the second glass substrate (S130);
The first glass layer and the second glass substrate are combined with the first glass substrate and the second glass layer in such a manner that the first bonding layer and the second bonding layer are in contact with the first contact region and the second contact region of the metal member, respectively. Laminating glass substrates to form an assembly (S140);
Heating at least the first bonding layer and the second bonding layer of the assembly to bond the first bonding layer and the second bonding layer to the metal member (S150); Have.

Hereinafter, each step will be described in detail.
In the following description, the vacuum multilayer glass manufacturing method according to the present invention will be described by taking the vacuum multilayer glass 100 configured as shown in FIG. 1 as an example.

(Step S110)
First, the second glass substrate 120 is prepared.

  A functional film 180 is stacked on the second surface 122 of the second glass substrate 120. The method for laminating the functional film 180 is not particularly limited. As a method for laminating the functional film 180, for example, a dry coating method is used. Examples of the dry coating method include a PVD method and a CVD method. Among PVD methods, vacuum deposition method, sputtering method, and ion plating method are preferable, and among these, sputtering method is possible because it can produce a film having excellent adhesion and flatness, and is widely used commercially. Is particularly preferred.

  Next, the second region 128 is formed by removing the functional film 180 in the region where the second glass substrate 120 and the seal member 150 overlap. The method for removing the functional film 180 is not particularly limited. As a method for removing the functional film 180, for example, there are physical etching (mechanical etching) such as removing the functional film 180 with a rotating grindstone, chemical etching, and the like, but a method by which the functional film 180 on the second glass substrate 120 can be removed. If it is, it will not be limited to these.

  Since the region other than the second region 128 from which the functional film 180 stacked on the second glass substrate 120 is removed becomes the first region 126, the first region 126 and the second region 128 are formed at the same time. .

(Step S120)
Next, the first glass substrate 110 is prepared, and the first bonding layer 160 having an annular shape around the periphery of the first glass substrate 110 is formed on the first surface 112 of the first glass substrate 110. The

  Hereinafter, the case where the first glass solidified layer is formed around the first surface 112 of the first glass substrate 110 will be described by taking the case where the first bonding layer 160 is a glass solidified layer as an example.

  When the first glass solidified layer is formed around the first glass substrate 110, first, a paste for the first glass solidified layer is prepared. Usually, the paste includes glass frit, ceramic particles, a polymer, an organic binder, and the like. However, the ceramic particles may be omitted. The glass frit eventually becomes a glass component constituting the first vitrified layer.

  The prepared paste is applied around the first surface 112 of the first glass substrate 110.

  Next, the first glass substrate 110 containing the paste is dried. The conditions for the drying treatment are not particularly limited as long as the solvent in the paste is removed. The drying process may be performed, for example, by holding the first glass substrate 110 at a temperature of 100 ° C. to 200 ° C. for about 30 minutes to 1 hour.

  Next, in order to pre-fire the paste, the first glass substrate 110 is heat-treated at a high temperature. The conditions for the heat treatment are not particularly limited as long as the organic binder contained in the paste is removed. The heat treatment may be performed, for example, by holding the first glass substrate 110 in the temperature range of 300 ° C. to 470 ° C. for about 30 minutes to 1 hour. Thereby, a paste is baked and a 1st glass solidified layer is formed. The thickness of the solidified layer at this time is 10 μm to 1000 μm.

  Similarly, a second bonding layer 165 is formed in the second region 128 of the second glass substrate 120.

  At this time, when the vacuum double-glazed glass 100 is viewed from above (thickness direction: Z direction in FIG. 1), the first bonding layer 160 and the second bonding layer 165 do not overlap with each other, and The second connection layer 165 is formed inside the first bonding layer 160.

(Step S130)
Next, an annular metal member 155 is prepared along the periphery of the vacuum multilayer glass.

  As described above, the annular metal member 155 may be an integrated product (seamless member) without a joint portion or a combination of a plurality of members.

  The ring-shaped metal member 155 that is an integral product (seamless member) can be easily manufactured, for example, by preparing a plate-shaped metal member and press-cutting so as to cut out the inside of the plate-shaped metal member.

(Step S140)
Next, an assembly is configured by combining the first and second glass substrates 110 and 120 and the annular metal member 155.

  At this time, the metal member 155 is disposed such that the third surface 170 is on the first glass substrate 110 side and the fourth surface 172 is on the second glass substrate 120 side. In addition, the metal member 155 is disposed such that the first contact region 175 is in contact with the first bonding layer 160 and the second contact region 177 is in contact with the second bonding layer 165.

  In this case, one or more spacers 190 may be disposed between the first glass substrate 110 and the second glass substrate 120 as necessary.

  A pressing force may be applied to the assembly from the side of the first glass substrate 110 and / or the second glass substrate 120 as necessary.

(Step S150)
Next, the assembly is heated. The heating temperature and the heating time vary depending on the softening point of the vitrified layer. For example, the assembly is placed in a chamber at a temperature of about 350 ° C. to about 600 ° C., preferably 470 ° C. to 560 ° C. (eg 490 ° C.) for about 5 seconds to 180 minutes, preferably about 15 seconds to 30 minutes (eg 20 Min)), after holding, it may be removed from the chamber and cooled to room temperature. In addition, you may implement a heat processing by heating the 1st and 2nd glass solidification layers 160 and 165 locally, for example instead of the whole assembly. In that case, a laser or the like can be used.

  Further, the first and second vitrified layers 160 and 165 may be pressurized by pressurizing the third surface 170 and the fourth surface 172 of the metal member 155 during the heat treatment of the assembly. When the vitrified layers 160 and 165 are thus pressurized, the bonding strength with the metal member 155 is increased. In addition, when the uneven | corrugated surface of an island-like pattern is comprised in the metal member 155, it can suppress that the glass solidification layers 160 and 165 fuse | melted (softened) by pressurization spread.

  By heating the assembly, the first and second vitrified layers 160 and 165 are melted (softened). For this reason, the metal member 155 is bonded to the first vitrified layer 160 in the first contact region 175, and is bonded to the second vitrified layer 165 in the second contact region 177. Therefore, after the heat treatment of the assembly, a gap 130 surrounded by the seal member 150 is formed between the first and second glass substrates 110 and 120.

  Thereafter, the inside of the gap 130 is decompressed using the openings provided in advance in the first and / or second glass substrates 110 and 120. For example, the gas in the gap 130 may be replaced with an inert gas. Furthermore, the opening used for the decompression process is sealed. Thereby, the vacuum multilayer glass 100 is manufactured.

  Note that the firing process of the assembly may be performed under a reduced pressure environment. That is, the firing process is performed in a state where the assembly is placed in a chamber in a pressure state lower than atmospheric pressure. When the firing process of the assembly is performed in a reduced pressure environment, the gap portion 130 is held in vacuum during firing, and thus the decompression process is completed simultaneously with the processing of the seal member. Furthermore, it is not necessary to make a hole in the glass substrate, and a decompression process step after firing is not necessary.

  Here, as described above, when the island-like pattern is formed in the first contact region 175 and the second contact region 177 of the metal member 155, the first and second melted (softened) by heating. The vitrified layers 160 and 165 are less likely to spread in the horizontal direction (X direction in FIG. 1) and remain in the first and second contact regions 175 and 177.

  For this reason, the seal member 150 to be finally produced has a significantly short seal width W. In addition, this makes it possible to suppress the narrowing of the light-transmitting region due to the provision of the seal member 150 and to manufacture the vacuum double-glazed glass 100 having a significantly wide light-transmitting region.

  A vacuum double-glazed glass 100 (example sample) having a structure as shown in FIG. 4 is prepared, and the surface opposite to the first surface 112 of the first glass substrate 110 of the vacuum double-glazed glass 100 (first The outer surface 114) of the second glass substrate 120 and the surface of the second glass substrate 120 opposite to the second surface 122 (second outer surface 124) are forcibly given a temperature difference repeatedly, and the durability of the seal member 150 is increased. Evaluated.

  Moreover, the vacuum double-glazed glass 200 (comparative example sample) which has a structure as shown in FIG. 2 was created, and the durability of the sealing member 250 was evaluated by the same method as the example sample.

  In addition, the dimension of an Example sample and a comparative example sample is 600 mm long x 600 mm wide.

Example 1
The method described below was used as a method for forcibly giving a temperature difference repeatedly between the first outer surface of the first glass substrate of the vacuum multilayer glass and the second outer surface of the second glass substrate. .

  On the first outer surface of the first glass substrate of the vacuum double-glazed glass, hot air (about 80 ° C.) is used using a hot air generator, and low temperature air (about 30 ° C.) using a blower and a cooling air generator. Were supplied alternately. The hot air is supplied until the surface temperature (T1) near the center of the outer surface of the first glass substrate of the vacuum double-glazed glass reaches a predetermined temperature (Ta). Low-temperature air was supplied until the surface temperature near the center of the outer surface of the first glass substrate of the multilayer glass was lowered to a predetermined temperature (Tb), and these were controlled to be repeated about every 30 minutes.

  On the other hand, a Peltier cooler with a fan was installed on the second outer surface of the second glass substrate of the vacuum multilayer glass to cool it. The cooler was controlled by a temperature controller and continuously supplied a refrigerant at about 10 ° C.

  At this time, the temperature difference between the second outer surface temperature (T2) of the second glass substrate and T1 is such that when T1 becomes Ta, the difference (ΔT1) between Ta and T2 becomes about 70 ° C. When T1 is Tb, the difference (ΔT2) between Tb and T2 is controlled to be about 20 ° C.

  For evaluating the durability of the sealing member, the temperature (T1) near the center of the first outer surface of the first glass substrate of the vacuum multilayer glass during the hot-air cycle test and the second of the second glass substrate When the temperature (T2) near the center of the outer surface is measured and the difference between T1 and T2 is small, it is determined that the sealing member is broken and the vacuum degree of the vacuum double-glazed glass is reduced, and the difference between T1 and T2 The number of cycles that began to decrease was recorded.

  As an example, the temperature (T1) near the center of the first outer surface of the first glass substrate in the hot air cycle test 1 in the case of using a vacuum double-layer glass having an intentionally unhealthy seal structure in FIG. And the temperature change of the temperature (T2) near the center of the 2nd outer surface of the 2nd glass substrate is shown.

  As shown in FIG. 7, after the 12th cycle, T1 does not reach the predetermined temperature (Ta), and T2 is high, and as a result of the sealing member breaking, the degree of vacuum decreases and the vacuum multilayer glass It can be seen that the degree of vacuum is reduced.

  Next, the durability of the sealing member 150 of the vacuum double-glazed glass 100 (Example Sample 1) having the structure shown in FIG. 4 was evaluated by the above method. Moreover, the vacuum multilayer glass 200 (Comparative example samples 1-3) which has a structure as shown in FIG. 2 as a comparative example was created, and durability of the sealing member 250 was evaluated by the same method as the Example sample 1. FIG.

  The evaluation results are shown in Table 3.

  As shown in Table 3, the temperature (T1) in the vicinity of the center of the first outer surface 114 of the first glass substrate 110 is a predetermined temperature even when 850 cycles or more have elapsed in the hot air cycle test 1 in Example Sample 1. The temperature (T2) that reaches the temperature (Ta) and near the center of the second outer surface 124 of the second glass substrate 120 does not increase, the seal member 150 does not break, and the degree of vacuum of the example sample 1 It was found that it was not lowered.

  On the other hand, the temperature of the comparative example sample 1 after the seventh cycle, the comparative example sample 2 after the 22nd cycle, the comparative example sample 3 after the 88th cycle, and the temperature near the center of the first outer surface 214 of the first glass substrate 210. (T1) does not reach the predetermined temperature (Ta), the temperature (T2) near the center of the second outer surface 224 of the second glass substrate 220 is increased, and the seal member 250 is broken, so that the comparison It turned out that the degree of vacuum of example samples 1-3 is falling.

(Example 2)
The method described below was used as a method for forcibly giving a temperature difference repeatedly between the first outer surface of the first glass substrate of the vacuum multilayer glass and the second outer surface of the second glass substrate. .

  On the second outer surface of the second glass substrate of the vacuum double-glazed glass, hot air (about 80 ° C.) is used using a hot air generator, and low temperature air (about 30 ° C.) using a blower and a cooling air generator. Were supplied alternately. The hot air is supplied until the surface temperature (T4) near the center of the outer surface of the second glass substrate of the vacuum double-glazed glass reaches a predetermined temperature (Ta). Low-temperature air was supplied until the surface temperature in the vicinity of the center of the outer surface of the second glass substrate of the multilayer glass decreased to a predetermined temperature (Tb), and these were controlled to be repeated about every 30 minutes.

  On the other hand, a Peltier cooler with a fan was installed on the first outer surface of the first glass substrate of the vacuum multilayer glass to cool it. The cooler was controlled by a temperature controller and continuously supplied a refrigerant at about 10 ° C.

  At this time, the temperature difference between the first outer surface temperature (T3) of the first glass substrate and T4 is such that when T4 is Ta, the difference (ΔT3) between Ta and T3 is about 70 ° C. When T4 was Tb, the difference (ΔT4) between Tb and T3 was controlled to be about 20 ° C.

  For evaluating the durability of the sealing member, the temperature (T4) near the center of the second outer surface of the second glass substrate of the vacuum double-glazed glass during the hot-air cycle test, and the first of the first glass substrate When the temperature (T3) near the center of the outer surface is measured and the difference between T3 and T4 is small, it is determined that the sealing member is broken and the vacuum degree of the vacuum double-glazed glass is reduced, and the difference between T3 and T4 The number of cycles that began to decrease was recorded.

  Next, the durability of the sealing member 150 of the vacuum double-glazed glass 100 (Example Sample 2) having the structure shown in FIG. 4 was evaluated by the above method. Moreover, the vacuum double-glazed glass 200 (Comparative example samples 4-8) which has a structure as shown in FIG. 2 as a comparative example was created, and durability of the sealing member 250 was evaluated by the method similar to the example sample 2. FIG.

  The evaluation results are shown in Table 4.

  As shown in Table 4, the temperature (T4) in the vicinity of the center of the second outer surface 124 of the second glass substrate 120 is a predetermined temperature even when 2700 cycles or more have elapsed in the hot air cycle test 1 in the example sample 2 The temperature (T3) reaches the temperature (Ta) and the temperature (T3) near the center of the first outer surface 114 of the first glass substrate 110 does not increase, the seal member 150 does not break, and the degree of vacuum of the example sample 2 It was found that it was not lowered.

  On the other hand, the comparative sample 4 is in the 5th cycle and after, the comparative sample 5 is in the 75th cycle and after, the comparative sample 6 is in the 169th cycle and after, the comparative sample 7 is in the 434th cycle and after, and the comparative sample 8 is in the 449th cycle. Thereafter, the temperature (T4) near the center of the second outer surface 224 of the second glass substrate 220 does not reach the predetermined temperature (Ta), and the first outer surface 214 of the first glass substrate 210 As a result of the temperature (T3) in the vicinity of the center being increased and the sealing member 250 being broken, it was found that the degree of vacuum of Comparative Samples 4 to 8 was decreased.

  INDUSTRIAL APPLICABILITY The present invention can be used for vacuum double glazing and the like used for building window glass and the like.

100, 200 Multi-layer glass 110, 210 First glass substrate 112, 212 First surface 114, 214 First outer surface 120, 220 Second glass substrate 122, 222 Second surface 124, 224 Second Outer surface 126, 226 First region 128, 228 Second region 130, 230 Gap 150, 250 Seal member 155, 255 Metal member 160, 260 First bonding layer 165, 265 Second bonding layer 170, 270 Third surface 172, 272 Fourth surface 175, 275 First contact region 177, 277 Second contact region 180, 280 Functional film 190 Spacer

Claims (15)

A multilayer glass having a gap between the first surface of the first glass substrate and the second surface of the second glass substrate facing each other,
The gap is sealed by a sealing member around the multilayer glass,
When the second glass substrate is viewed from the thickness direction of the multilayer glass, the first region where the functional film is laminated in addition to the region where the second glass substrate and the seal member overlap A second region in which a functional film is not laminated in a region where the second glass substrate and the seal member overlap,
The seal member includes a metal member having an annular shape around the multilayer glass when the multilayer glass is viewed from the thickness direction, and a first annular shape along the periphery of the first glass substrate. And a second bonding layer having an annular shape around the periphery of the second glass substrate,
The second bonding layer is disposed in the second region, and the first bonding layer and the second bonding layer do not overlap when viewed from the thickness direction of the multilayer glass. And the said 2nd joining layer is arrange | positioned inside the said 1st joining layer, The multilayer glass characterized by the above-mentioned.   The said multilayer glass is a multilayer glass of Claim 1 comprised by making the said gap | interval part into a pressure state below atmospheric pressure.   The multilayer glass according to claim 1 or 2, wherein the functional film is a heat ray reflective film.   The multilayer glass according to any one of claims 1 to 3, wherein the second region is formed by physically etching the functional film.   The multilayer glass according to any one of claims 1 to 4, wherein the metal member has an uneven surface of an island pattern including a plurality of concave or convex island portions.   The metal member includes a first contact region that contacts the first bonding layer, and a second contact region that contacts the second bonding layer, and the first contact region and the second contact region. The multilayer glass according to any one of claims 1 to 5, wherein an uneven surface of an island pattern including a plurality of concave or convex island portions is formed in the contact region.   The multilayer glass according to any one of claims 1 to 6, wherein the first bonding layer and / or the second bonding layer includes a glass solidified layer.   The said sealing member is any one of Claim 1 to 7 arrange | positioned inside the end surface of a said 1st glass substrate or a said 2nd glass substrate, when the said multilayer glass is seen from a thickness direction. Double-layer glass described in 1.   The multilayer glass according to any one of claims 1 to 8, wherein the metal member is configured as an integral product having no joint.   10. The metal member according to claim 1, wherein the metal member has a shape in which a height of the third surface changes from one end portion to the other end portion when viewed from a cross-sectional direction. Multi-layer glass. The metal member has a third surface and a fourth surface which are front and back,
11. The multilayer glass according to claim 1, wherein both the first contact region and the second contact region are disposed on the third surface side. The metal member has a third surface and a fourth surface which are front and back,
The multilayer glass according to any one of claims 1 to 11, wherein the first contact region and the second contact region are arranged on the third surface and the fourth surface side, respectively. . A method for producing a multilayer glass comprising a gap portion between a first surface of a first glass substrate and a second surface of a second glass substrate facing each other,
When viewed from the thickness direction of the multilayer glass, a first region where a functional film is laminated other than a region where the second glass substrate and the seal member overlap is formed, and the second glass Forming a second region in which a functional film is not laminated in a region where the substrate and the sealing member overlap;
A first bonding layer having an annular shape around the periphery of the first glass substrate is formed, and the first bonding layer is the second region when viewed from the thickness direction of the multilayer glass. Forming a second bonding layer having an annular shape along the periphery of the second glass substrate so as not to overlap with the layer and to be disposed inside the first bonding layer;
Providing an annular metal member having an annular shape around the periphery of the first glass substrate or the second glass substrate;
The first glass layer and the second glass substrate are combined with the first glass substrate and the second glass layer in such a manner that the first bonding layer and the second bonding layer are in contact with the first contact region and the second contact region of the metal member, respectively. Laminating glass substrates to form an assembly;
Heating at least the first bonding layer and the second bonding layer of the assembly to bond the first bonding layer and the second bonding layer to the metal member. A method for producing a multi-layer glass.   The method for producing a multi-layer glass according to claim 13, wherein the bonding step includes a step of heating the first bonding layer and the second bonding layer while applying pressure to the assembly in a thickness direction.   The method for producing a multilayer glass according to claim 13 or 14, wherein the first bonding layer and / or the second bonding layer has a glass solidified layer.

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