JP2002137940A - Method of fabricating glass panel and glass panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of fabricating a glass panel enabling secure sealing of suction holes by relatively simple procedure, resulting in low level of projection from the surface of a plate glass being aesthetically excellent and enabling to reduce the risk of harming vacuum of gap via collision with a foreign object. SOLUTION: This fabrication method of a glass panel comprises the steps of sealing the outer periphery of a pair of plate glasses to form air-gap between the plate glasses, sucking gas in the air-gap via a suction hole provided at one of the plate glass to make the gap in vacuum state, and sealing the suction hole, where molten metal solder is flown into the gap via the suction hole, and the metal solder is cooled to solidify while directly contacting to the surrounding part of the suction hole at the gap side of a plate glass with the suction hole and to the vicinity of the suction hole at the gap side of another plate glass to that the communication between the suction hole and the gap is shut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of forming a gap between a pair of glass sheets by interposing a number of spacers between a pair of glass sheets and sealing the outer peripheral portions of the glass sheets with an outer peripheral sealing portion. After providing a suction hole for sucking the gas in the gap portion in one of the two glass plates, sucking the gas in the gap portion through the suction hole, and reducing the pressure in the gap portion The present invention relates to a method of manufacturing a glass panel for sealing the suction hole and the glass panel.

[0002]

2. Description of the Related Art In this type of glass panel, conventionally, a glass tube is fixedly connected to a suction hole provided in one of the glass sheets in a communicating state, and gas in a void portion is sucked through the glass tube. It is common to heat and melt the protruding tip of the tube to seal the suction hole. Therefore, in a conventional glass panel, a part of the glass tube protrudes from the suction hole and remains.

[0003]

If a part of the glass tube protrudes and remains on the surface of the plate glass as described above, not only does the appearance of the glass panel deteriorate, but also the glass tube is damaged by contact with other objects. As a result, the gap cannot be maintained in a reduced pressure state, and there is a possibility that the heat insulation performance is reduced.

[0004] In view of the above, according to Japanese Patent Application No. 10-198686 previously filed, the present applicant places a solder plate and a closing plate on an upper surface of a glass plate provided with a suction hole while closing the suction hole. After heating and melting the solder plate,
A method was proposed in which the molten solder plate was cooled and solidified to integrate the glass sheet and the closing plate to seal the suction hole.

According to this method, the amount of protrusion of the closing plate from the surface of the sheet glass can be made extremely small, and there is little possibility that the closing plate is damaged by contact with other objects and the reduced pressure state in the gap is impaired. Become. However, in order to firmly adhere the closing plate to the plate glass with the molten solder plate, it is necessary to previously metallize the surface of the plate glass. That is, it is necessary to form a special layer on the surface of the plate glass by sintering silver paste or the like, and there is still some room for improvement in this respect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the amount of protrusion from the surface of a sheet glass and to provide an aesthetically pleasing appearance, and to reduce the pressure in a gap by contact with another object. An object of the present invention is to provide a method of manufacturing a glass panel, which can reduce the risk of a state being damaged and can reliably seal a suction hole by a relatively simple method, and to provide the glass panel.

[0007]

[Means for Solving the Problems] The constitution of the invention according to claim 1 is, as illustrated in FIGS. 1 to 4, a large number of spacers 2 interposed between a pair of glass sheets 1A and 1B, and The outer periphery of the two glass sheets 1A, 1B is hermetically sealed by an outer peripheral sealing portion 3 to form a gap V between the two glass sheets 1A, 1B.
Is formed, and one of the two glass sheets 1A, 1B is provided with a suction hole 4 for sucking the gas in the gap V, and the gas in the gap V is sucked through the suction hole 4. Then, a method of manufacturing a glass panel for sealing the suction hole 4 after the gap V is decompressed, using a metal solder 6 as a sealing material for sealing the suction hole 4, The metal solder piece 6A is heated and melted in the vicinity of the suction hole 4, breaks the oxide film 6a on the surface of the metal solder piece 6A in the molten state, and removes the metal solder 6 therein through the suction hole 4. The metal solder 6 that has flowed into the portion V and has flowed into the gap V is provided around the suction hole 4 on the plate surface on the gap V side of the sheet glass 1A provided with the suction hole 4. , And the other of the sheet glass 1B on the side of the gap V In a state in which said direct contact with the vicinity portions of the suction holes 4 of the surface, and was cooled and solidified, the suction holes 4 by blocking the communication between the void portion V and the suction holes 4
Is to be sealed.

A feature of the invention according to claim 2 is that a portion of the plate surface on the gap side of the both glass sheets, which directly contacts the metal solder, is previously processed into a smooth surface. is there.

A third feature of the present invention is that the metal solder is indium or an alloy containing indium.

FIG.
2, a large number of spacers 2 are interposed between a pair of glass sheets 1A and 1B,
The outer peripheral portions of A and 1B are sealed by an outer peripheral sealing portion 3 to form a gap V between the two glass plates 1A and 1B.
A, 1B, is provided with a suction hole 4 for sucking the gas in the gap V, and the gas in the gap V is sucked through the suction hole 4 so that the gap V Is a reduced pressure state, and is a glass panel in which the suction hole 4 is sealed, wherein a metal solder 6 is provided in the space V, and a metal plate 6 on the side of the space V of the glass sheet 1A provided with the suction hole 4 is provided. Filling the portion of the plate surface around the suction hole 4 and the portion near the suction hole 4 on the plate surface of the other sheet glass 1B on the side of the gap V, filling the suction hole 4
The suction hole 4 is sealed by blocking communication between the suction hole 4 and the gap V.

A feature of the invention according to claim 5 is that the metal solder is indium or an alloy containing indium.

Note that, as described above, reference numerals are provided for convenience of comparison with the drawings. However, the present invention is not limited to the configuration shown in the accompanying drawings.

According to the first aspect of the present invention, the molten metal solder is supplied to the suction hole on the plate surface on the side of the gap of the sheet glass provided with the suction hole in the gap. Cooling and solidifying not only around the part but also in the vicinity of the suction hole on the plate surface on the gap side of the other plate glass, so that the communication between the suction hole and the gap is cut off, The suction hole can be easily sealed. Therefore, even if another object comes into contact with the surface of the plate glass (glass panel), there is almost no possibility that the metal solder is damaged, and the metal solder and the plate glass plate surface that come into direct contact with each other in the gap V as described above. Does not come into direct contact with the atmosphere, so those contact points are unlikely to deteriorate due to corrosion, etc.
A good contact state between the metal solder and the surface of the glass sheet in the gap is maintained, and the possibility that the reduced pressure state in the gap is impaired is reduced. In addition, since the metal solder flows into the gap through the suction hole and is filled with the metal solder, the amount of the metal solder to be melted is adjusted, so that the suction on the surface of the plate glass (glass panel) can be easily performed. The amount of protrusion of the metal solder from the hole can be reduced. Therefore, it is possible to manufacture a glass panel that can reduce the amount of protrusion from the surface of the plate glass, is excellent in aesthetic appearance, and can reduce the possibility that the reduced pressure state in the gap is impaired due to contact with other objects. Can be.

Further, the molten metal solder flowing into the void portion heats and melts the metal solder piece in the vicinity of the suction hole, breaks the oxide film on the surface of the molten metal solder piece, and removes the metal solder contained therein. Because it is a spill
In a state where the oxide film is not interposed, the metal solder comes into direct contact with the surface of the glass plate, and the suction hole can be sealed with high adhesive strength. Therefore, it is possible to manufacture a glass panel that can reliably shut off the communication between the suction hole and the gap and easily maintain the decompressed state of the gap for a long period of time.

As described above, in the gap, the metal solder is provided around the suction hole on the plate surface on the gap side of the plate glass provided with the suction hole, and on the other side of the plate glass on the gap side. The suction hole is filled in a state in which it is in direct contact with the vicinity of the suction hole on the surface, and the suction hole is sealed by blocking the communication between the suction hole and the gap. Irrespective of whether or not the sealing is performed, for example, whether or not the peripheral wall is tightly filled with a metal solder), the depressurized state of the gap can be reliably maintained, and even simple and reliable is there.

According to the characteristic configuration of the second aspect of the present invention, the portion of the gap between the two glass plates, which is in direct contact with the metal solder, is previously processed into a smooth surface, so that it flows into the gap. The wettability of the molten metal solder to the surface of the glass sheet at such a portion is improved. Therefore, the metal solder can be filled in the gap in a state in which the metal solder is more closely adhered to the surface of the glass sheet. Therefore, the contact state between the sheet glass plate surface and the metal solder in the above-mentioned gap becomes more tight, and it is possible to more reliably shut off the communication between the suction hole and the gap and seal the suction hole. it can.

According to the characteristic feature of the third aspect of the present invention, since the metal solder is indium or an alloy containing indium, the metal solder has a high adhesive strength to glass, is excellent in sealing performance, and is more firmly in the void portion. Thus, the communication between the suction hole and the gap can be more reliably blocked, and the suction hole can be sealed.

According to the characteristic feature of the invention of claim 4, the metal solder is filled in the gap, the portion around the suction hole on the plate surface on the gap side of the plate glass provided with the suction hole, and the gap of the other plate glass. Since the suction hole is sealed by filling the portion near the suction hole of the plate surface on the side of the portion in a state where the suction hole is in direct contact with it and blocking the communication between the suction hole and the gap portion, the plate glass (glass panel) The present invention can provide a glass panel in which the amount of protrusion of the metal solder from the surface can be reduced, which is excellent in aesthetic appearance, and which is less likely to impair the depressurized state in the gap due to contact with other objects. In addition, the suction holes can be effectively and reliably sealed with a small amount of metal solder.

According to the characteristic feature of the present invention, since the metal solder is indium or an alloy containing indium, indium or an alloy of indium having a high adhesive strength to glass and excellent sealing performance is provided. Accordingly, communication between the suction hole and the gap can be firmly and reliably blocked, and the suction hole can be sealed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a glass panel according to the present invention and an embodiment of the glass panel will be described below with reference to the drawings. The glass panel, as shown in FIG.
A large number of spacers 2 are interposed between the pair of glass sheets 1A, 1B to form a gap V between the glass sheets 1A, 1B, and the outer peripheral portions of the glass sheets 1A, 1B are mutually sealed by the outer peripheral sealing portion 3. It is configured. The gap V is, for example, 1.33 Pa (1.0 × 10 ⁻² T).
(corresponding to orr). The pressure is reduced as follows. For this reason, a suction hole 4 for suction and pressure reduction is provided in one plate glass 1A, and the suction hole 4 is sealed after the suction operation.

Sheet glass 1 used for this glass panel
A and 1B have, for example, a thickness of 2.65 mm to 3.2 mm.
It is possible to use various types of flat glass such as flat glass, frosted glass, glazed glass, reinforced glass, tempered glass, and flat glass with functions such as heat ray absorption, ultraviolet ray absorption, heat ray reflection and low radiation. The thickness of the sheet glass can also be appropriately selected and used depending on the type of glass used and the like. Further, it is not always necessary to use the same type and thickness of the two glass sheets 1A and 1B, and it is also possible to use different types and thicknesses of glass sheets.

The spacer 2 has a compressive strength of 4.9 ×
Using a material of 10 ⁸ Pa (equivalent to 5 t / cm ² ) or more, for example, stainless steel (SUS304), the diameter is about 0.3 mm to 1.0 mm, and the height is 0.15 mm to
A columnar shape of about 1.0 mm is preferable, and an interval between the spacers 2 is preferably about 20 mm. However, the material of the spacer 2 is not particularly limited to stainless steel. For example, the spacer 2 can be formed of various materials such as Inconel 718, other metal materials, quartz glass, and ceramics. Is not limited to a columnar shape, but may be a prismatic shape, and the spacing between the spacers 2 can be changed as appropriate.

The outer peripheral sealing portion 3 is formed of a low-melting glass such as a solder glass, and seals between the outer peripheral edges of the two glass plates 1A and 1B so that the internal gap V is maintained in a sealed state. It is configured. In addition, both sheet glass 1A, 1B
Among them, one sheet glass 1A is the other sheet glass 1
B, the area is slightly smaller than that of B. Therefore, the outer peripheral edge of the other glass sheet 1B protrudes from the outer peripheral edge of one glass sheet 1A. By placing the sealing material of
It is configured such that the sealing operation of the gap V by the outer peripheral sealing portion 3 can be performed efficiently and reliably.

As shown in detail in FIG. 2, the suction hole 4 has a diameter of 2 mm, for example. Then, filling is performed so as to directly contact the portion around the suction hole 4 on the plate surface on the gap V side of the sheet glass 1A and the vicinity of the suction hole 4 on the plate surface on the gap V side of the other sheet glass 1B. The suction hole 4 is sealed by interrupting the communication between the suction hole 4 and the gap V by the metal solder 6, and a guide plate 7 as an annular regulating member is attached to the surface of the glass sheet 1A. The cover member 8 covers the guide plate 7 and the metal solder 6.

Considering the temperature (-30 ° C. to 100 ° C.) when the glass panel is used, the metal solder 6 preferably has a melting temperature of about 120 ° C. to 250 ° C.
Indium with a melting temperature of 156.4 ° C can be used. Indium has strong adhesion to glass,
It is suitable as the metal solder 6 because it has excellent sealing performance and a thin oxide film formed on the surface. However, since indium is a relatively expensive metal, for example, an alloy of 50% indium and 50% tin (solid line 11)
5.6 ° C, liquidus line 126.9 ° C) or indium 40%
Alloy with 60% lead (solidus 173.0 ° C, liquidus 22
5.0 ° C.).

By the way, as the metal solder 6,
The use of indium or an indium alloy also has the following advantages. That is, the metal solder 6 and the sheet glass 1A,
Based on the fact that the coefficient of linear expansion differs from that of 1B, the metal solder 6 is solidified in a state of being directly in contact with the glass sheets 1A and 1B, and then the metal solder 6 and the glass sheets 1A and 1B Even if stress is generated at the bonding interface with the metal, since indium or an indium alloy is soft, the stress can be relieved and the risk of the metal solder 6 peeling can be reduced. Therefore, it can be expected that the depressurized state of the gap is stably maintained for a long period of time.

Since the guide plate 7 is for regulating the flow of the metal solder 6, it may be made of any material as long as it can prevent the metal solder 6 from flowing outside. Since it is preferable that the occluded gas on the surface can be easily degassed in a vacuum, a porous material is not suitable. For example, a metal or ceramic plate, a stainless steel mesh, or the like is used. Approximately 1 mm is optimal. The cover member 8 can also be made of various materials, but has a strong adhesive force to the metal solder 6 and a coefficient of thermal expansion close to that of the glass sheets 1A and 1B constituting the glass panel. Is preferred, it is preferable to use a glass plate having the same composition as the plate glasses 1A and 1B.

Next, an apparatus for sealing the suction hole 4 with the metal solder 6 will be described. As shown in FIGS. 3 and 4, this sealing device has a rectangular through hole 9 at the center.
And a swingable weight 12 is provided around a weight horizontal axis 11 provided on the base 10, and the pedestal 10 has a weight horizontal axis 1.
A rotator 14 is pivotally attached via a rotator horizontal shaft 13 parallel to 1. The weight 12 and the rotor 14
Means that the pedestal 10, the weight 12, and the rotator 14 among the pedestal 10, the weight 12, and the rotator 14 are made of a magnetic material such as iron. The other pedestal 10 and weight 12 are made of a non-magnetic material.

The pedestal 10 and the like constituting the sealing device are configured to be housed in a cylindrical tube 15 made of a non-magnetic material, and the upper surface of the tube 15 is sealed by a glass plate 16. An O-ring 17 is provided on the lower surface of the cylindrical body 15 to seal the space between the cylindrical body 15 and the plate glass 1A. The glass plate 1
An electromagnet 18 is provided above the free end of the rotator 14 on the upper surface of the rotor 6.
5 is provided with a flexible pipe 19 for sucking the gas in the gap V of the glass panel through the internal space of FIG.

Next, a method of manufacturing a glass panel by sealing the suction hole 4 using the sealing device will be described.
First, as shown in FIG. 4A, the sheet glasses 1A, 1B
The glass panel is set so that the plate surface is substantially horizontal, and the pedestal 10 is placed on the plate glass 1 </ b> A having the suction holes 4. At this time, the suction hole 4 is placed so as to be located in the through hole 9 of the pedestal 10, and the guide plate 7 is inserted into the through hole 9 and placed on the plate glass 1A. The metal solder piece 6A is placed inside. That is, the guide plate 7 is placed on the glass plate 1A in a state where the suction hole 4 and the metal solder piece 6A are surrounded by the annular guide plate 7.

The distance between the place where the metal solder piece 6A is placed and the suction hole 4 is appropriately set in accordance with the type and amount of the metal solder piece 6A to be used. When the diameter of the suction hole 4 is 2 mm and the thickness of the layer of the gap V is 0.2 mm, when using indium alone as the metal solder piece 6A, about 0.3 g is set to about 8 mm. V can be uniformly filled. The weight 12 is placed on the upper surface of the cover material 8 with one end of the cover material 8 being engaged and mounted on the upper surface of the free end of the rotator 14. It is placed so as to cover the entire body in the cylindrical body 15.

The glass panel and the sealing device are housed in a heating furnace 20 in a state where the glass panel is horizontal, and evacuated through the flexible pipe 19 while heating to, for example, 200 ° C. Then, while the air in the cylindrical body 15 is sucked, the air in the gap V is also sucked through the suction hole 4. Indium as the metal solder piece 6A melts at a temperature of 156.4 ° C. or higher, but its shape is substantially maintained due to surface tension.
Even if the metal solder piece 6A is activated by melting, the cylindrical body 15
Since the inside is close to a vacuum, the promotion of oxidation of the surface of the metal solder piece 6A is prevented.

When the electromagnet 18 is energized when the metal solder piece 6A is in a molten state and the gap V is in a predetermined reduced pressure state, the rotor 14 is moved upward by the attraction force of the electromagnet 18. And the engagement with the cover member 8 is released. Then, the cover member 8 falls onto the molten metal solder piece 6A located below, and the weight of the weight 12 acts, so that the molten metal solder piece 6A is instantaneously crushed. That is, as shown in FIG. 4 (b), the oxide film 6a on the surface is broken by impact,
The contents of the metal solder pieces 6A flow out.

The contents of the metal solder pieces 6A that have flowed out flow on the surface of the sheet glass 1A, flow into the suction holes 4 with the outflow thereof being restricted by the guide plate 7, and further pass through the suction holes 4. Then, the suction hole 4 flows into the gap V and is formed on the plate surface of the plate glass 1A on which the suction hole 4 is provided.
And directly in contact with the vicinity of the suction hole 4 on the plate surface of the other plate glass 1B on the side of the gap V as well. In this state, if the heating by the heating furnace 20 is stopped to wait for cooling, the molten metal solder pieces 6A are solidified and are in direct contact with the plate surfaces of the glass sheets 1A and 1B on the side of the gap V side. With the metal solder 6 filled in the gap V, the communication between the suction hole 4 and the gap V is cut off, the sealing of the suction hole 4 is completed, and a waterproof sealant such as silicone is applied as necessary. Or attaching a cap completes the production of the glass panel.

Incidentally, in order to reliably shut off the communication between the suction hole 4 and the gap V, the contents of the metal solder piece 6A are caused to flow into the gap V, and when the metal solder 6 is filled, the suction hole 4 is closed. The following points should be noted so that the metal solder 6 is uniformly filled around the outlet on the side of the gap V.

[1] The glass panels are installed so that the plate surfaces of the plate glasses 1A and 1B are substantially horizontal, and the gap space of the gap V passes through the center point of the suction hole 4 and is orthogonal to the plate glasses 1A and 1B. Is formed so as to be substantially line-symmetric with respect to the virtual center line to be formed. Then, the molten metal solder piece 6A that has flowed into the gap V is
It can be made to flow into the gap V substantially concentrically from the outlet on the side.

[2] The amount of the metal solder 6 is adjusted so that the amount of the metal solder piece 6A flowing into the gap V in the molten state becomes an appropriate amount. For example, assuming that the metal solder 6 is filled around the suction hole 4 having a diameter of 2 mm to a diameter of about 6 mm, the amount of the metal solder 6 is determined by the amount of filling the void V with the diameter and the amount of filling the suction hole 4. It may be adjusted so as to be the total amount of the suction hole 4 and the amount filled in the cover material 8 on the surface side of the plate glass 1A.

[3] The temperature and time from when the metal solder piece 6A starts flowing until it solidifies are properly controlled. In other words, according to the above [1], the molten metal solder piece 6A flowing into the gap V through the suction hole 4 is substantially concentric from the outlet of the hole of the suction hole 4 to the gap V side. The outflow speed varies depending on the temperature and the size of the diameter of the suction hole 4, and decreases to a certain speed when it flows into the gap V to some extent. Therefore, since the size of the diameter of the suction hole 4 is appropriately set in advance to a predetermined value, if the temperature and the time from when the metal solder piece 6A starts flowing to when it solidifies are constant, the inside of the gap V The amount of the flowing metal solder pieces 6A can be made substantially constant,
When the temperature is kept constant and the time until the metal solder piece 6A is solidified is set to the time until the outflow velocity is substantially saturated, the metal solder 6 can be stably and appropriately filled in the void V. .

[Another Embodiment] Another embodiment will be described below. <1> In the above embodiment, the guide plate 7 is adhered around the suction hole 4 sealed with the metal solder 6, and the guide plate 7
Although the glass panel has a configuration in which the cover member 8 covers the metal panel 6 and the metal solder 6, the glass panel can be configured without the guide plate 7 and the cover member 8 as shown in FIG. 5. In the glass panel of FIG. 5 as well, the suction device 4 is sealed using the sealing device described in the previous embodiment and in exactly the same manner, and then the guide plate 7 and the cover member 8 are removed. Will be formed. Therefore, the guide plate 7 and the cover member 8 are made of a material that is difficult to adhere to the metal solder 6,
For example, it is preferably formed of aluminum or the like, and since the metal solder 6 or the suction hole 4 is exposed,
It is preferable to apply a waterproof coat or attach a cap for protection.

<2> In the above embodiment, the metal solder 6 is uniformly filled in consideration of the points [1] to [3] described above. However, the present invention is not limited to this embodiment. By arranging the damming member 5 at an appropriate position near the exit of the suction hole 4 on the side of the gap V as shown in FIG. 5, the flow of the molten metal solder piece 6A flowing into the gap V is intended. It is also possible to uniformly fill the void V with the metal solder 6 by damping the surface. The details will be described below.

The damping material 5 is preferably a material having relatively low affinity for the molten metal solder, that is, a material that is hardly wetted. For example, a stainless steel plate can be used. 2 mm, the diameter of the suction hole 4 is 2
mm, the stainless steel plate has an inner diameter of 6 mm and an outer diameter of 10 mm.
The dam member 5 is formed into a ring shape having a thickness of 0.1 mm and a thickness of 0.1 mm. Thus, the thickness of the damming member 5 is
The thickness of the layer in the gap V is set smaller than the thickness of the layer in the gap V.
When the inside of the gap V is decompressed, a space for deaeration can be secured. Even if such a gap exists, the damping material 5 has poor wettability with the molten metal solder, so that the molten metal solder flows over the damping material 5 and diffuses into the void V. There is almost no fear.

Incidentally, when the damping material is disposed in the gap, if a projection is formed in a part of the damping material in advance, the damping material will be placed on the surface of both glass sheets in the gap V. When a glass panel is tilted or a gap is depressurized, the position of the glass panel is hardly changed, and a predetermined location can be more reliably filled with metal solder. For example, the ring-shaped damming member 5 is folded into two in a substantially equal manner in advance, and a protruding portion 5A is formed so that a part of the cross-sectional shape becomes a substantially horizontal U-shape, as shown in the conceptual diagram of FIG. As described above, if it is disposed in the gap V, the bottom side 5B of the damping member 5 contacts the plate surface of the glass sheet 1B, and the protruding portion 5A sandwiches the suction hole 4 by the elastic action of the damping member 5 itself. Since it is intended to contact the plate surface of the sheet glass 1A, the damping material 5 can be easily and reliably provided.
Can be fixed at an appropriate position.

Further, if the damping material 5 is provided with air permeability, when the pressure in the gap V is reduced, the resistance of the gas when degassing the gas inside the gap V is reduced, so that degassing can be performed more easily. It is easy to do. For example, damming material 5
If formed from a breathable stainless steel mesh plate,
The shape processing is simpler than a stainless steel plate or the like. In this case, for example, a stainless wire with a wire diameter of 0.05 mm
What is necessary is just to make a plain weave of 0 mesh, and at that time, the opening is 0.077 mm and the opening ratio is 36.8%.

<3> In the above embodiment, the sheet glass 1A,
When the surface on the side of the gap V of 1B is flat, microscopically, the molten metal solder 6 and the sheet glass 1A, 1B
Are closely adhered with almost no gap, exhibit a high sealing property, and can maintain the reduced pressure state of the gap V for a long period of time. However, when there are microscopic irregularities on the surface of the plate glass 1A, 1B on the side of the gap V (when the plate glass 1A, 1B is made of ground glass, Low-E glass coated on the plate surface, or the like). Molten metal solder 6 and sheet glass 1A,
Since there is a possibility that a non-contact portion may be generated in the contact portion of 1B and a problem that the high depressurized state of the gap V cannot be maintained may occur, so of the plate surfaces of the plate glasses 1A and 1B on the side of the gap V,
It is preferable that at least a portion to be brought into direct contact with the metal solder 6 is previously processed into a smooth surface having no microscopic unevenness that does not cause a problem. Such processing can be easily performed by polishing, for example, as follows.

First, a coarse mesh (for example, No. 150) is polished with sand, and an appropriate fine mesh (for example, 40) is polished.
No. 0) and sand. Thereby, the polishing efficiency can be improved. After the polishing is finished with a certain amount of mesh sand, polishing (polishing) is performed using a finishing abrasive (fine powder of cerium oxide or the like). In the above-mentioned sand-only polishing, even if it is finished with a very fine mesh (for example, No. 1000) sand, there is microscopic unevenness,
By performing such polishing, it is possible to finish a smooth surface to such an extent that there is no problem in maintaining the reduced pressure state of the gap V for a long period of time.

<4> Also, the sealing device for sealing the suction hole 4 with the metal solder 6 is not limited to the one shown in the previous embodiment, and for example, the one having the following configuration is used. Can be. For example, the sealing device shown in FIG. 8 includes a flexible pipe 19 for sucking the gas in the gap V.
And a box-shaped body 21 provided with an O-ring 17 for hermetically sealing the space between the sheet-shaped glass 1A and a cylinder 22. Inside the box-shaped body 21, a cylinder 22 and a slider 23 slidably disposed within the cylinder 22 are provided.
An injection hole 25 is communicated with the cylinder 22 of the injector 24, and a filter 26 is provided in the cylinder 22. The injector 24 is attached to the box-shaped body 21. On the other hand, it is configured to be slidable in the vertical direction while maintaining the sealed state.

According to this sealing device, the box-like body 21 is set so that the injection hole 25 is located above the suction hole 4, and the metal solder piece 6 A is inserted into the cylinder 22 to remove the injector 2.
4 is heated to melt the metal solder pieces 6A in the cylinder 22 and slide the injector 24 downward,
The injection hole 25 faces the suction hole 4 (or is inserted). When the molten metal solder 6 is injected into the gap V from the injection hole 25 through the suction hole 4 by sliding the slider 23, the oxide film 6a mixed into the molten metal solder 6 becomes The outflow into the injection hole 25 is prevented by the filter 26, and only the content of the metal solder piece 6 </ b> A is injected from the suction hole 4 into the gap V. Therefore, as in the case of the above sealing device, the molten metal solder piece 6A is solidified and waited for cooling, and the metal solder 6 forms the suction hole 4A.
The communication between the suction hole 4 and the gap V is interrupted, and the sealing of the suction hole 4 is completed.

<5> In the above embodiment, as an example, a method of manufacturing a glass panel for sealing the suction hole 4 after simply performing a suction operation of degassing the gas in the gap V to reduce the pressure, and the glass panel thereof However, the method for manufacturing a glass panel and the glass panel according to the present invention are not limited to such a form. For example, after the air gap V is degassed from the suction hole 4, a new gas ( After filling the gap V with a rare gas or the like, a glass panel (for example, a plasma display panel or the like) in which the suction hole 4 is sealed in order to maintain the gap in a depressurized state in which gas is sealed. Of course, you may implement. Further, the glass panel according to the present invention can be used for a wide variety of applications, for example, for construction and vehicles (automobile window glass, railway vehicle window glass, ship window glass) and equipment elements ( It can be used for a surface glass of a plasma display, an opening / closing door or wall of a refrigerator, an opening / closing door or wall of a heat retaining device, and the like.

<6> The sheet glass used in the glass panel of the present invention is one in which one sheet glass and the other sheet glass are not limited to those having different lengths and widths, but are formed to have the same dimensions. May be used.
The composition of the glass may be soda silicate glass (soda lime silica glass), borosilicate glass, aluminosilicate glass, or various crystallized glasses. In the glass panel according to the present invention, the outer periphery of the plate glass may be sealed with a metal solder containing indium, lead, tin, zinc, or the like as a sealing material as a main component.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a glass panel.

FIG. 2 is a sectional view of a main part of a glass panel.

FIG. 3 is a perspective view of a glass panel and a sealing device.

FIG. 4 is a cross-sectional view showing an operation of sealing a suction hole by a sealing device.

FIG. 5 is a cross-sectional view of a main part of a glass panel showing another embodiment.

FIG. 6 is a cross-sectional view of a main part of a glass panel showing another embodiment.

FIG. 7 is a sectional view of a main part of a glass panel showing another embodiment.

FIG. 8 is a sectional view of a main part of a glass panel showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Plate glass 2 Spacer 3 Perimeter sealing part 4 Suction hole 6 Metal solder 6A Metal solder piece 6a Oxide film V Void

Claims (5)

[Claims] 1. A large number of spacers are interposed between a pair of glass sheets, and a space between the glass sheets is formed by sealing between the outer peripheral portions of the glass sheets with an outer peripheral sealing portion. After providing a suction hole for sucking the gas in the gap in one of the glass sheets, sucking the gas in the gap through the suction hole, and reducing the pressure in the gap,
A method of manufacturing a glass panel for sealing the suction hole, wherein a metal solder is used as a sealing material for sealing the suction hole, and the metal solder piece is heated and melted in the vicinity of the suction hole, and the melting is performed. Breaking the oxide film on the surface of the metal solder piece in the state, the metal solder contained therein flows into the gap through the suction hole, and the metal solder flowing into the gap is provided with the suction hole. Cooling and solidifying in a state in which a portion of the plate surface on the gap side of the certain glass sheet around the suction hole and the vicinity of the suction hole on the plate surface on the gap portion side of the other sheet glass are in direct contact. Then, a method of manufacturing a glass panel in which the suction hole is sealed by blocking communication between the suction hole and the gap. 2. The method for manufacturing a glass panel according to claim 1, wherein a portion of the plate surface on the gap side of the both glass plates, which is in direct contact with the metal solder, is previously processed into a smooth surface. 3. The method for manufacturing a glass panel according to claim 1, wherein the metal solder is indium or an alloy containing indium. 4. A plurality of spacers are interposed between a pair of glass sheets, and a gap between the glass sheets is formed by sealing between the outer peripheral portions of the glass sheets with an outer peripheral sealing portion. A suction hole for sucking the gas in the gap is provided in one of the glass sheets, the gas in the gap is sucked through the suction hole, the gap is depressurized, and the suction hole is sealed. It is a glass panel, wherein a metal solder is provided in the gap, a portion of the plate surface on the gap side of the plate glass provided with the suction hole, around the suction hole, and the gap of the other sheet glass. A glass panel in which the suction hole is sealed by filling in a state in which the suction hole is in direct contact with the vicinity of the suction hole on the plate surface on the side of the unit and blocking communication between the suction hole and the gap. . 5. The glass panel according to claim 4, wherein the metal solder is indium or an alloy containing indium.