JP2008266059A - Reduced pressure double glazed glass panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reduced pressure double glazed glass panel in which artistic design property provided in a conventional plate glass is reproduced while keeping feature of thinness and excellent thermal insulation. <P>SOLUTION: In the reduced pressure double glazed glass panel constituted so that a pair of panel bodies P1, P2 structured by having plate glass 1, 2 are oppositely arranged across a plurality of spacers 3 which are interspersed between both panel bodies P1, P2, the gap between the outer peripheral parts of both panel bodies P1, P2 is sealed with a sealing material 4 and the space part V between both panel bodies P1, P2 is kept to a reduced pressure state, at least one panel body P1 in the pair of the panel bodies P1, P2 is transparent and is formed so that the degree of unevenness on the panel outer surface Plo being an opposite surface to a panel inner surface Pli is larger than that on the panel inner surface P1i facing the space part V and the unevenness D of the panel outer surface causes the distortion of a reflected image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, a pair of panel bodies configured with plate glass are arranged facing each other through a plurality of spacers interspersed between the two panel bodies, and between the outer peripheral portions of the two panel bodies. The present invention relates to a reduced-pressure multilayer glass panel that is sealed with a sealing material and that maintains a gap between the two panel bodies in a reduced pressure state.

The birth of flat glass was in the Middle Ages and was often used for stained glass at the beginning. In addition, various plate glass manufacturing methods have been conceived with the transition to the modern times, and for example, they have been manufactured by methods such as "casting method", "full coal method", and "colburn method". . In the plate glass technology at this time, it is difficult to form a flat surface as in modern times, and the plate glass at that time (hereinafter simply referred to as the conventional plate glass) has a non-uniform thickness and a surface of 10 μm or more. It had irregularities (see FIG. 9).
As the “float method” was born in the 1950s, it became possible to form a flat glass plate (the amount of irregularities is about 1 to 2 μm) as it is today (see FIG. 8).
If such a flat plate glass is used, it is possible to form a reduced-pressure multi-layer glass panel by interposing a plurality of spacers of the same size between a pair of plate glasses and reducing the pressure between the sealed gaps between the plate glasses. It becomes. That is, atmospheric pressure acts on the spacer from the outer surface of the plate glass as the gap portion is depressurized, and the position of the spacer is held by the pressing force, and a depressurized space having a constant thickness dimension is secured between both plate glasses. Can do. Then, by forming the decompression space, the air serving as a heat transfer medium is not (or little) in the gap portion, and the heat insulation performance of the glass panel can be extremely enhanced.
Thus, it has become possible to provide a highly heat-insulating glass panel by using a float plate glass having a uniform thickness and flat front and back surfaces.
Conventionally, as this type of reduced-pressure multi-layer glass panel, as shown in FIG. 7, a spacer in which a pair of panel bodies P1, P2 made of a single-plate float plate glass having a uniform thickness is arranged at a predetermined interval. The opening between the outer peripheral portions is sealed with the sealing material 4 over the entire circumference in a state of facing through 3 and the gap portion V between both panel bodies P1, P2 can be maintained in a reduced pressure state. (For example, see Patent Document 1).
Such a reduced-pressure multi-layer glass panel can reduce the overall thickness dimension because high heat insulation performance can be obtained even if the thickness dimension of the gap is extremely small. It has the merit that the reduced-pressure multilayer glass panel can be replaced and installed as it is with respect to the sash in which has been fitted. For reference, in the case of so-called “multi-layer glass” in which a pair of panel bodies are formed by sealing only between the outer peripheral parts with an air layer interposed therebetween, it is necessary to secure the air layer with a sufficient thickness. The overall thickness dimension becomes large, and it becomes difficult to attach the conventional sash as it is. Therefore, in the case of the “multi-layer glass”, for example, it is necessary to attach an attachment or the like to the sash and attach the multi-layer glass through the attachment, and the conventional appearance in which the single plate glass is fitted to the sash It becomes a different and unnatural thing, and the designability tends to be lowered.
On the other hand, with respect to the design of the reduced-pressure multi-layer glass panel itself, a float plate glass excellent in flatness is used, and the surface is slightly bent due to the pressure reduction of the gap portion (the spacer is formed by atmospheric pressure acting on the outer surface). Although the glass part in between is bent by about 2 to 3 μm toward the gap part), the bending is difficult to understand visually. Therefore, the surface of the reduced-pressure multilayer glass panel is generally flat, and the fluoroscopic image and the reflected image are not distorted.

Japanese Patent No. 3321159 (FIG. 2)

According to the above-mentioned conventional reduced-pressure double-glazed glass panel, although it has the merit that it can be set as it is to a sash for a single plate glass, while ensuring high heat insulation properties, the appearance of the conventional plate glass as an appearance It was difficult to reproduce such design properties.
That is, assuming that the old plate glass is used instead of the float plate glass as the plate glass to be used, since the amount of irregularities on the surface of the old plate glass itself is large, the thickness dimension of the gap between the two plate glasses is also unsatisfactory. There is a risk that the spacers become uniform, the spacers are hardly held in a stable state, and move in the gap. As a result, if the spacer spacing varies greatly depending on the location, the load acting on each spacer also varies, and there is a concern that a location where a large load concentrates on the traditional sheet glass also occurs and breaks from that portion. The That is, according to the conventional reduced-pressure multi-layer glass panel, there is a problem that the performance stability is extremely lowered when trying to reproduce the design like the conventional plate glass as the appearance.

  Accordingly, an object of the present invention is to provide a reduced-pressure multi-layer glass panel that can reproduce the design like an old plate glass while eliminating the above-mentioned problems and maintaining the characteristics of being thin and having excellent heat insulating properties. .

According to a first characteristic configuration of the present invention, a pair of panel bodies each provided with a sheet glass are arranged facing each other through a plurality of spacers interspersed between the two panel bodies. In the reduced pressure multilayer glass panel in which the outer periphery of the body is sealed with a sealing material and the gap between the two panel bodies is maintained in a reduced pressure state, at least one of the pair of panel bodies The panel body is transparent, the panel outer surface opposite to the panel inner surface is formed with a greater degree of unevenness than the panel inner surface facing the gap, and the panel outer surface unevenness is This is where the reflected image is uneven.
Here, the panel body may be a single plate glass, a laminated body in which the plate glass and the plate glass are integrally bonded, or a laminated body in which the plate glass and the plate-like synthetic resin are integrally bonded. May be. The laminated body includes so-called laminated glass bonded through an intermediate film.

According to the first characteristic configuration of the present invention, at least one of the pair of panel bodies has a panel outer surface opposite to the panel inner surface rather than a panel inner surface facing the gap. Since the degree of unevenness is large, and the unevenness on the outer surface of the panel is formed so that the reflected image is distorted, the appearance of the outer surface of the panel body reproduces the design like that of the conventional plate glass It becomes possible to do. In addition, since the unevenness on the inner surface of the panel is formed smaller than the outer surface of the panel, the change in the thickness of the gap between the two panel bodies can be reduced, and the two panel bodies can be reliably connected to each position where the spacer is installed. It is possible to make it difficult to move. As a result, a reduced pressure space can be ensured between the two panel bodies more reliably, and the heat insulation performance of the reduced pressure multilayer glass panel can be easily exhibited.
Of course, the overall thickness of the reduced-pressure multilayer glass panel can be reduced.
Therefore, it becomes possible to provide a reduced-pressure double-glazed glass having a design like that of a conventional plate glass while maintaining the characteristics of being thin and rich in heat insulation.
As an example of the application of the present invention, there is an example in which an old single plate glass fitted in an old sash of a historical building is replaced with the reduced pressure double glazed glass panel. Even in such a case, if the reduced-pressure double-glazed glass, the entire thickness can be formed as thin as an old single plate glass, so it can be directly fitted to an old sash, Thermal insulation performance can be improved. And, if it is installed so that the panel outer surface of the one panel body of the reduced-pressure multilayer glass panel faces the outside, the appearance of the reflected image is distorted as in the case of the conventional single plate glass, The old landscape can be maintained.

  According to a second characteristic configuration of the present invention, the panel inner surface of the panel body is formed on a flat surface or a substantially flat surface.

  According to the second characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effect of the first characteristic configuration of the present invention, any spacer can be used when the gap is secured by the spacer. It is possible to install the panel body in a more reliable state by touching the inner surface of the panel body, to realize a load distribution distributed by all the spacers, and to construct a reduced pressure multilayer glass panel that is extremely stable in terms of stress. Is possible.

  According to a third characteristic configuration of the present invention, the one panel body is formed so that the unevenness amount Δ of the panel inner surface when the pressure of the gap portion is equal to the atmospheric pressure satisfies the following formula: is there.

但し、
Δ：一方のパネル体のパネル内面の凹凸量（ｍｍ）
Ｌ：スペーサピッチの２倍値（ｍｍ）
ｔ：一方のパネル体の厚み（ｍｍ）

However,
Δ: Concavity and convexity on the panel inner surface of one panel body (mm)
L: Twice the spacer pitch (mm)
t: thickness of one panel body (mm)

  According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described operation and effect of the first characteristic configuration of the present invention, any spacer can be used when the gap is secured by the spacer. It is possible to install the panel body in a more reliable state by touching the inner surface of the panel body, to realize a load distribution distributed by all the spacers, and to construct a reduced pressure multilayer glass panel that is extremely stable in terms of stress. Is possible.

  According to a fourth characteristic configuration of the present invention, the unevenness of the panel outer surface of the one panel body is set to 10 μm or more.

  According to the 4th characteristic structure of this invention, in addition to being able to achieve the above-mentioned effect by any 1st-3rd characteristic structure of this invention, the design feeling of a panel outer surface is made into the conventional plate glass. It becomes possible to reproduce in a close state, and it becomes possible to provide a reduced pressure double-glazed glass having a design like that of a conventional plate glass. And if the panel outer surface of the decompression double-glazed glass panel is set to face the outside, the appearance of the reflected image will be distorted like the case of the conventional single plate glass, and the traditional landscape will be maintained. be able to.

  According to a fifth characteristic configuration of the present invention, the one panel body is composed of a laminated body in which a plate glass disposed on the panel inner surface side and an outer surface material disposed on the panel outer surface are integrally bonded, It exists in the said unevenness | corrugation being formed in the said outer surface material.

According to the 5th characteristic structure of this invention, in addition to being able to achieve the above-mentioned effect by any 1st-4th characteristic structure of this invention, the said glass plate and the said outer surface material are adhere | attached. As a result, a panel body having a greater degree of unevenness on the outer surface of the panel than on the inner surface of the panel can be formed, which is simple and efficient.
Further, the degree of unevenness on the outer surface of the panel can be arbitrarily changed, and various product requirements can be easily satisfied.
Furthermore, since the composite body is composed of a composite material of plate glass and outer surface material, for example, different functional materials (strength, durability, etc.) are selected according to the use location and application of the reduced pressure multilayer glass panel. And more sophisticated product requirements can be met.

  According to a sixth characteristic configuration of the present invention, the one panel body is formed of a single plate glass, and the unevenness is formed by uneven processing on the outer surface of the plate glass.

  According to the sixth characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects according to any one of the first to fourth characteristic configurations of the present invention, the panel body is configured by a single plate glass. Thus, a panel body with higher unity can be provided. And the uneven processing on the outer surface of the plate glass can be variously formed by, for example, chemically forming unevenness on the surface of the plate glass, forming unevenness on the surface of the plate glass by cutting, forming unevenness on the surface of the plate glass by polishing, etc. It is possible to select a rough surface processing, and accordingly, the finishing texture of the panel outer surface can be manipulated as intended, and it is possible to provide a reduced-pressure multilayer glass panel with higher design. .

In general, the surface unevenness of the plate glass has a “roughness” component having a wavelength of several millimeters or less, a “swell” component having a wavelength of several to several tens of mm, and a “wavelength” of about several tens to several hundreds of millimeters. Divided into “warping” components.
Here, the unevenness in the present invention affects the reflected image of the glass panel and the arrangement state of the spacer, and includes a so-called “waviness” component and a part of “warping” component having a short wavelength. Moreover, the unevenness | corrugation amount in this invention means the height difference of the peak and trough of surface unevenness | corrugation.
For reference, the surface shape of the plate glass shown in FIGS. 8 and 9 is obtained by measuring a 30 mm square measurement range using a non-contact type three-dimensional measuring device (manufactured by Mitaka Kogyo, NH-3N type). is there.

  Embodiments of a reduced pressure multilayer glass panel according to the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

As shown in FIG. 1, the reduced-pressure multilayer glass panel P described in the present embodiment has a pair of transparent panel bodies P1 and P2 interposed through a plurality of spacers 3 interspersed between the two panel bodies P1 and P2. The panel members P1 and P2 are sealed with the sealing material 4 and the gap V between the panel members P1 and P2 is kept in a reduced pressure state. Configured.
And although not shown in a figure, it is inserted in sashes, such as a window, and is used as a window glass, for example.
The sealing material 4 is made of, for example, a material such as a low-melting glass having a lower melting point than that of plate glass and high airtightness.

The panel bodies P1 and P2 are respectively composed of single transparent glass plates 1 and 2, and the glass plates 1 and 2 are composed of float glass plates formed by a float method. The thicknesses of the plate glasses 1 and 2 are both about 3 to 5 mm, and the gap V is decompressed to 1.33 Pa (1.0 × 10 ⁻² Torr) or less.
Further, as shown in FIG. 2, the other front and back surfaces P1i, P2o, and P2i excluding the panel outer surface P1o of one panel body P1 are all configured as flat surfaces. Specifically, although the surface of the glass formed by the float process has a small amount of unevenness, the surface is generally finished with an unevenness amount of about 1 to 2 μm, and the panel inner surface P1i of the one panel body P1. Moreover, since the panel inner surface P2i and the panel outer surface P2o of the other panel body P2 leave the surface state as manufactured by the float process, the unevenness amount is about 1 to 2 μm.
The panel outer surface P1o of the one panel body P1 is provided with unevenness D having an unevenness amount of 10 μm or more by uneven processing. This uneven processing is, for example, buffing processing, chemical processing using a solvent such as hydrogen fluoride, a method of forming a new silicate film on the surface using a sol-gel method, Other irregularities can be employed. However, the thing which can ensure the transparency of plate glass after a process is preferable.
The unevenness D is formed to such an extent that the reflected image is distorted. For example, the unevenness D is manufactured by a method such as “casting method”, “full coal method”, and “colburn method”, which are conventional plate glass forming methods. Finished so that the shape and texture of the glass surface can be reproduced.
Accordingly, in the one panel body P1, the degree of unevenness is greater on the panel outer surface P1o which is opposite to the panel inner surface P1i facing the gap portion V than on the panel inner surface P1i.

The spacer 3 is preferably cylindrical in shape, and has a compressive strength of 4.9 × 10 ⁸ Pa (5 × 10 ³ kgf / cm ² ) or more so that it can withstand the atmospheric pressure acting on the two glass plates 1 and ² . It is made of a material such as stainless steel (SUS304) or Inconel 718.
And in the said embodiment, the diameter of the columnar spacer 3 is set to about 0.3-1.0 mm, and height is set to about 0.15-1.0 mm, and the space | interval between each spacer 3 is set. , About 20 mm.

  In the present embodiment, in order to reduce the pressure of the gap V, as an example, the other glass plate 2 includes a large-diameter hole 5a having a diameter of about 3 mm and a small-diameter hole 5b having a diameter of about 2 mm as shown in FIG. And a glass tube 6 is inserted into the large-diameter hole 5a. The glass tube 6 is bonded to the plate glass 2 by the low melting point glass 7 having a melting point lower than that of the glass tube 6 or the plate glass 2. The tip of the glass tube 6 is fixed by melting, and the whole is covered with the cap 8.

Hereinafter, an example of a process for producing the reduced-pressure multilayer glass panel P will be briefly described.
One plate glass 1 is supported almost horizontally, paste-like low melting point glass is applied to the upper surface of the outer peripheral portion, and a number of spacers 3 are arranged at predetermined intervals, and the other plate glass is disposed from above. 2 is mounted (see FIG. 3A).
Thereafter, the glass tube 6 is inserted into the suction hole 5 of the plate glass 2 positioned above. The glass tube 6 can be inserted only into the large-diameter hole 5a of the suction hole 5 and is set to be longer than the depth of the large-diameter hole 5a. The doughnut-shaped low-melting glass 7 is disposed around the protruding portion of the glass tube 6, and the suction sealing device 9 is mounted from above (see FIG. 3B).

With the suction sealing device 9 mounted, both the glass sheets 1 and 2 are placed almost horizontally and stored in the heating furnace 14, and the sealing material 4 is melted by firing at a temperature at which the glass sheets 1 and 2 do not melt. Then, the joining process of sealing the gap V by joining the outer peripheral parts of the both glass sheets 1 and 2 with the sealing material 4 in the molten state is performed. At that time, the low melting glass 7 of the suction hole 5 is also melted, and the glass tube 6 is hermetically bonded and fixed.
Thereafter, the inside of the gap V is depressurized to 1.33 Pa or less by the suction sealing device 9, and the tip opening of the glass tube 6 is sealed, and after cooling, the cap 8 is bonded to the plate glass 2, A laminated glass panel P is manufactured (see FIG. 3C).
And the uneven | corrugated amount about 10 micrometers or more is formed in the panel outer surface P1o of one panel body P1 of the pressure-reduced multilayer glass panel P by the uneven | corrugated process as mentioned above or more (FIG.3 (d)). reference). However, this unevenness processing may be performed on the surface of one panel body P1 in advance before each panel body is put in the heating furnace 14 and the periphery is sealed.

  According to the reduced-pressure multi-layer glass panel P according to the present invention, the panel outer surface P1o of one panel body P1 can be formed in an uneven state like an old plate glass, for example, an old one fitted in a sash Even if the plate glass is removed and replaced with the reduced-pressure multilayer glass panel P, it is possible to maintain the old landscape without changing the design of the appearance. And it becomes possible to exhibit the outstanding heat insulation effect with which the pressure-reduced multilayer glass panel was originally equipped.

Incidentally, in order to stably hold the spacer, it is necessary that the panel body bent by the action of the atmospheric pressure as the gap portion V is reduced is in contact with the spacer. The inventor found an allowable value of the unevenness Δ of the panel inner surface P1i.
Hereinafter, a method for deriving the allowable value of the unevenness amount Δ will be described.

FIG. 4 is a cross-sectional view of the main part of the reduced-pressure multilayer glass panel when the pressure in the gap V is equal to the atmospheric pressure. Of the three spacers 31, 32, 33 adjacent to each other, the two spacers 31, 33 located at both ends are in contact with the panel inner surface Pli of one panel body. There may be a gap between the spacer 32 located in the middle and P1i. Here, when the spacers 31 and 33 are in contact with the uneven ridges of Pli, the uneven valleys of the Pli are directly above the spacers 32, and the thickness of the spacers 31 and 33 is the maximum and the thickness of the spacers 32 is the minimum. The gap is maximized. The maximum value of the gap is expressed as the sum of the unevenness amount Δ of Pli and the thickness variation d of the spacer.
On the other hand, if the deflection amount δ of Pl in the middle of the spacers 31 and 33 when the gap V is in a reduced pressure state is equal to or larger than the maximum value of the gap, the spacer 32 is Abut. That is, as long as the condition is satisfied, the position of the spacer 32 is held by the pressing force due to the atmospheric pressure and does not move in the gap portion V, and the gap portion V having a constant thickness dimension between both panel bodies. Can be secured.

  Here, the form of deflection of one panel body P1 supported by the spacers 31 and 33 is considered as a two-side simple support beam that receives an evenly distributed load. In this case, the deflection amount of one panel body P1 is obtained from Equation 3.

但し、
δ：一方のパネル体の撓み量（ｍｍ）
α：たわみ係数
ω：荷重（ｋｇ／ｍｍ² ）
Ｌ：スペーサピッチの２倍値（ｍｍ）
Ｅ：パネル体のヤング率（ｋｇ／ｍｍ² ）
ｔ：一方のパネル体の厚み（ｍｍ）

However,
δ: Deflection amount of one panel body (mm)
α: Deflection coefficient ω: Load (kg / mm ² )
L: Twice the spacer pitch (mm)
E: Young's modulus of panel body (kg / mm ² )
t: thickness of one panel body (mm)

If one panel body is a single plate soda lime glass, α = 0.156 and E = 7.3 × 10 ³ kg / mm ² . Α is a value determined by a ratio between L (length of the support beam) and t (width of the support beam), and specifically, values at L ≦ 5 mm and t = 1 mm (= spacer diameter). It is. Further, since atmospheric pressure is applied as a load, ω = 0.01 kg / mm ² . Therefore, if these numerical values are substituted into Equation 3, Equation 4 is obtained.

スペーサの厚みバラツキｄを、ｄ＝６×１０^-3ｍｍとすれば、数２および数４より数１が導き出される。

Assuming that the spacer thickness variation d is d = 6 × 10 ⁻³ mm, Equation 1 is derived from Equation 2 and Equation 4.

  From the standpoint of stable holding of the spacers, the inner surface of the panel body is preferably smooth. Therefore, if the condition of Equation 1 is satisfied, even a conventional plate glass can be used as a panel body.

[Calculation example]
FIG. 5 shows a calculation result of the unevenness amount Δ obtained from Equation 1 under the conditions of t = 3 to 5 mm and L = 5 to 50 mm. Here, the unit of Δ on the vertical axis is converted to “μm”.
If the unevenness of the inner surface of one panel body is equal to or smaller than the values in the plots of FIG. 5, when the gap V is in a reduced pressure state, all the spacers are applied to the panel inner surface Pli without a gap. Means contact.

[Another embodiment]
Other embodiments will be described below.
<1> In the previous embodiment, the one in which the unevenness D is formed only on the panel outer surface of one panel body among the pair of panel bodies P1 and P2 is not limited to the form. Concavities and convexities D may be formed on the outer surface of the panel body.
In short, it is only necessary that at least one panel body of the pair of panel bodies P has a greater degree of unevenness than the inner surface of the panel body and an unevenness that causes distortion in the reflected image. Further, the transparency of the panel body does not mean that the visible light transmittance is 90% or more, but may be a visible light transmittance lower than that. However, the so-called “ground glass” having an effect of blocking the perspective is not included.
<2> In the previous embodiment, each of the pair of panel bodies P1 and P2 has been described using a single-plate float plate glass, but is not limited to such a form.
For example, at least one of both panel bodies P1 and P2 may be a laminated glass made of a plurality of plate glasses.
Moreover, as shown in FIG. 6, at least one panel body P1 of the pair of panel bodies P1, P2 includes a plate glass 1 disposed on the panel inner surface P1i side, and an outer surface material 20 disposed on the panel outer surface P1o. It is also possible to adopt a form in which the concavo-convex D is formed on the outer surface material 20. In this case, the outer surface material may be a plate glass formed by a conventional manufacturing method other than the float method, or a synthetic resin sheet or the like.
<3> The pair of plate glasses 1 and 2 may be, for example, tempered plate glass, mold plate glass, netted glass, lined plate glass, low reflection glass, or high transmission plate glass, depending on the application or purpose of the reduced pressure multilayer glass panel P. Further, ceramic printed glass, special glass having a heat ray or ultraviolet ray absorbing function, or the like may be used or combined.
<4> Any glass plate 1 or 2 may be used as long as it satisfies the above-described requirements, and soda silicate glass, soda lime glass, borosilicate glass, aluminosilicate glass, and various crystals. A vitrified glass or the like can be used, and the thickness of the plate glasses 1 and 2 can be selected as appropriate.
<5> As described in the previous embodiment, the suction hole 5 is not limited to the one formed on the other plate glass, and may be formed on one plate glass, for example.
If the environment inside the heating furnace 14 for sealing the outer periphery of the panel body can be reduced, the gap V has already been reduced in a state where the reduced-pressure double-glazed glass panel P is carried out of the heating furnace, and the suction hole 5 is not necessary, and the reduced-pressure multilayer glass panel P can be formed efficiently.
<6> The sealing material 4 used for the reduced-pressure multilayer glass panel, the material of the spacer 3 and the like are not limited to those described in the previous embodiment, and known materials can also be used.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. Further, it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention.

Sectional view showing a reduced-pressure multilayer glass panel Cross-sectional view of the essential parts of a reduced-pressure multilayer glass panel Schematic diagram showing the manufacturing process of the reduced-pressure multilayer glass panel Cross-sectional view of the essential parts of a reduced-pressure multilayer glass panel Explanatory drawing which shows the calculation result of the unevenness amount of plate glass Sectional drawing of the principal part of the reduced pressure multilayer glass panel of another embodiment Cross-sectional view of a conventional reduced-pressure multilayer glass panel Explanatory drawing showing surface irregularities of float glass Explanatory drawing showing the surface irregularities of sheet glass manufactured by the casting method

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet glass 2 Sheet glass 3 Spacer 4 Sealing material 20 Outer surface material D Concavity and convexity G Matching body P Decompression double-layer glass panel P1 One panel body P1o Panel outer surface P1i Panel inner surface P2 The other panel body V Gap part

Claims (6)

A pair of panel bodies provided with plate glass are arranged facing each other through a plurality of spacers interspersed between the two panel bodies, and a sealing material is provided between the outer peripheral portions of the two panel bodies. A reduced-pressure double-glazed glass panel that is sealed in and holds the gap between the two panel bodies in a reduced-pressure state,
Of the pair of panel bodies, at least one panel body is transparent, and the degree of unevenness is greater on the panel outer surface opposite to the panel inner surface than the panel inner surface facing the gap. And the unevenness | corrugation of the said panel outer surface is a pressure-reduced multilayer glass panel which is an unevenness | corrugation which produces distortion in a reflected image.   The reduced-pressure multilayer glass panel according to claim 1, wherein the panel inner surface of the panel body is formed on a flat surface or a substantially flat surface. 2. The reduced-pressure multilayer glass panel according to claim 1, wherein the one panel body is formed so that an unevenness amount Δ on the inner surface of the panel when the pressure in the gap is equal to the atmospheric pressure satisfies the following formula.

However,
Δ: Concavity and convexity on the panel inner surface of one panel body (mm)
L: Twice the spacer pitch (mm)
t: thickness of one panel body (mm)   The reduced-pressure multilayer glass panel according to any one of claims 1 to 3, wherein the unevenness of the panel outer surface of the one panel body is set to 10 µm or more.   The one panel body is composed of a laminated body in which a plate glass disposed on the panel inner surface side and an outer surface material disposed on the panel outer surface are integrally bonded, and the unevenness is formed on the outer surface material. The reduced-pressure multilayer glass panel according to any one of claims 1 to 4.   The said one panel body is comprised with the plate glass of a single plate, The said unevenness | corrugation is formed by the unevenness | corrugation process with respect to the outer surface of the plate glass, The reduced pressure multilayer glass panel as described in any one of Claims 1-4. .

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