JPH10282462A - Gap eliminated device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with various kinds of panel sizes only by exchanging a part of a jig by integrally absorb-holding an assembling frame, a panel supporting member, a depressing plate and a pressing sheet member. SOLUTION: A space between a panel supporting member G and a pressing sheet member P is suck-decompressed by passing through an absorbing pads 5, 5A and a vacuum pump 9. Air in the space formed by the members G and P and inside of a glass panel is sucked to make a decompressed state. By this suck-decompression, a frame plate body is closely adhered to a receiving tray through an annular packing and the pads 5 and 5A are also closely adhered to the receiving tray. Consequently, the variation of the size of the glass panel is coped with only by changing the depressing plate or an annular spacer and and used as a gap eliminated jig. In addition, as pressurizing and heating are carried out while minimizing the influence of thermal expansion and the influence of chamber by the constitution of the jig, a liquid crystal panel of high definition is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for forming a uniform gap by pressing a glass substrate for a liquid crystal panel coated with a resin between two glass substrates having a transparent electrode disposed on the inner surface thereof.

[0002]

2. Description of the Related Art Conventionally, an indirect pressurizing method using vacuum pressure has been known as a method for setting a gap in a liquid crystal panel as described above (Japanese Patent Publication No. 3-4888). But,
In the jig for implementing this method, the flexible sheet contacting the upper surface of the panel and the mold contacting the lower surface of the panel have different coefficients of thermal expansion when heated. As a result of the difference in the magnitude of the force for restraining each of the substrates, there is a problem in that the elongation of the upper and lower glass substrates is different, the glass substrates are displaced, and the panel quality is reduced. On the other hand, the present applicant has proposed a decompression method using packings on the upper and lower sides in order to prevent displacement of the upper and lower substrates (Japanese Patent Application Laid-Open No. Hei 8-26788). However, in this method, there is a problem that the panel is bent by its own weight, causing the panel to be displaced. Also, this method requires a jig for each panel size,
It was necessary to prepare many jigs.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and an object of the present invention is to provide various types of panels simply by replacing a part of a jig when corresponding to various panel sizes. It is an object of the present invention to provide a jig which can respond to the panel size. Another object of the present invention is to provide a jig that does not cause a difference in thermal expansion between the upper and lower glass substrates and does not cause a displacement due to deflection due to its own weight.

[0004]

In order to achieve the above object, the present invention provides a gap setting jig comprising: a pair of left and right support legs erected at both ends of an upper portion of a substrate; A pair of mounting members provided, and a suction pad communicating with a vacuum source disposed with a tip thereof slightly protruding above the installation surface of the mounting member below the mounting member of the pair of supporting legs, and An assembling frame; a tray formed in a size that can be mounted on the pair of mounting members, and having a suction hole vertically penetrated at a position corresponding to the suction pad; A panel support member comprising: an annular spacer fixed to an upper inner portion; and a holding plate fixed to the tray by the annular spacer, the holding plate having good thermal conductivity, rigidity, and high planar accuracy. -On A pressing plate having the same dimensions as the external dimensions of the glass panel to be mounted, having good thermal conductivity and rigidity, and having high planar accuracy; and a frame-shaped frame plate mounted on the upper portion of the tray, A pressure sheet member which is formed of a flexible sheet that is kept airtight inside the lower surface of the frame plate and is provided with an annular packing around the lower surface of the frame plate. It is a feature. Further, in the gap setting jig according to the present invention, the assembly frame has a configuration in which a pair of mounting members and a suction pad are arranged in a plurality of stages with a vertical interval with respect to the support leg. It is a feature. ADVANTAGE OF THE INVENTION According to this invention, when respond | corresponding to various panel sizes, it can respond by only replacing a part of jig. Further, the difference in thermal expansion between the two glass substrates is not caused, and the displacement caused by the deflection of the glass panel due to the weight of the substrate is not caused.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. The gap setting jig according to the present invention includes an assembly frame F, a panel support member G, a pressing plate H, and a pressing sheet member P.
The structure of the assembly frame F having the above structure is as follows. A pair of left and right aluminum legs 2, 2A are vertically erected at both upper ends of the substrate 1 having the pedestal. The upper ends of the legs 2, 2A are connected by the frame 3 so that the legs 2, 2A do not shake. So that it is fixed. A cross section L is provided inside the upper position and the intermediate position of the pair of legs 2, 2A.
The mounting members 4, 4A are fixed in pairs, and the mounting members 4, 4A of the pair of legs 2, 2A are fixed.
At the lower position, there are attached via suction frames 6, 6A suction pads 5, 5A made of silicon, the ends of which protrude slightly above the mounting surfaces of the mounting members 4, 4A. The suction pads 5, 5A are connected to a vacuum pump unit 9 via internal ventilation holes 7, 7A and heat-resistant hoses 8, 8A. The vacuum pump unit includes a vacuum pump, a pressure sensor, a pressure regulating valve, a tank for suppressing pulsation, and a pressure controller. The above is the configuration of the assembly frame F.

Next, the structure of the panel supporting member G which is the second structure will be described. Suction holes 10, which are formed in a size that can be mounted on the pair of mounting members 4, 4A and penetrate vertically at positions corresponding to the suction pads 5, 5A.
A saucer 11 made of metal (or a laminated plate such as a glass cloth aramid cloth impregnated with a heat-resistant resin) with a hole 10 and a suction hole 10 on the saucer 11 are arranged at an inner position. Aluminum part with cutouts (not shown) for ventilation (heat-resistant resin may be used)
And a holding plate 11A fixed to the tray by the annular spacer. The annular spacer 12 can be lengthened or shortened inward to change the width of the hollow portion surrounded by the annular spacer 12, and its wall width depends on the size of a glass panel W described later. Is changed. The thickness of the protruding portion of the stepped portion of the annular spacer 12 is slightly higher than the thickness of the glass panel W, the pressing plate H described later, and the intermediate sheet Q interposed therebetween. The depth of the engraved portion of the stepped portion is slightly (about 0.2 mm) deeper than the thickness obtained by adding the thickness of the holding plate 11A and the thickness of the intermediate sheet Q interposed therebetween. ing. The above is the configuration of the panel support member G. The thickness of the protruding portion of the annular spacer 12 is thicker than the thickness of the glass panel W, the pressing plate H and the intermediate sheet Q interposed therebetween, but may be thinner. ± 1m for the thickness of the sho plate H and the intermediate sheet Q
The distance may be in the range of about m. As an intermediate sheet,
It is preferable that it has a low coefficient of friction and has heat resistance. For example, a fluororesin sheet, a glass cloth, a fluororesin-impregnated glass cloth, or a fluororesin-based porous sheet is suitable.

Next, the configuration of the pressing plate H, which is the third configuration, will be described. The pressing plate H has the same dimensions as the outer dimensions of the glass panel W, and is made of a material having good thermal conductivity and rigidity and high planar accuracy. The pressing plate H preferably has a thermal expansion coefficient close to that of a glass panel such as ceramic or glass. The thermal expansion coefficient can be used as long as it is about 0.05 to 3 times the glass plate. In addition, stainless steel, aluminum alloy, etc. can be used as long as the coefficient of thermal expansion is in the above range. In this sense, the material is not limited.

Next, the structure of the pressure sheet member P which is the fourth structure will be described. A frame-shaped frame plate 13 placed on the upper portion of the tray 11 and a fluoro rubber (silicon rubber, heat-resistant material) stretched inside the lower surface of the frame plate 13 may be stretchable. An annular packing 15 made of silicon is provided around the lower surface of the frame plate 13. In addition, the annular packing 15
May be made of fluoro rubber. The frame plate 13 and the flexible sheet 14 are interposed with a silicone sheet packing 16 fitted on the inner peripheral edge of the lower surface of the frame plate 13 and fastened by sheet retainers 17 and mounting bolts 18 to maintain airtightness. It is in a state. The suction holes 10, 10 are provided in a positional relationship between the annular spacer 12 and the sheet retainer 17, respectively. The above is the configuration of the pressure sheet member P. In FIG. 1, M is a hot air circulation type oven.

The procedure for forming a gap in the glass panel W by the above-mentioned structure will be described. The assembly frame F is placed on a surface plate (not shown) outside the hot air circulation oven M, and the holding plate 11A is placed thereon. Saucer 1
1 is placed on the placing members 4 and 4A. At this time, the suction pad 5,
The tip of 5A is pressed downward and slightly deformed, and the suction holes 10, 10 and the suction pads 5, 5A are in communication. Next, a spherical spacer 22 is interposed between the upper and lower glass substrates 20, 21 and the glass substrates 20, 2 are interposed.
The glass panel W coated with the thermosetting sealing material 23 between the peripheral edges of the glass panel W is placed on the holding plate 11A, and then the pressing plate H corresponding to the size of the glass panel W is placed on the glass panel W. Place on. Thus, the glass panel W is placed on the panel supporting member G, and the pressing plate H is placed on the glass panel W. Next, the pressure sheet member P is placed on the panel supporting member G in a corresponding manner (see FIG. 2).
An intermediate sheet Q for reducing frictional force is interposed between the lower surface of the pressing plate and the upper and lower surfaces of the holding plate 11A. It may be simply placed, or may be fixed to the pressing plate and the holding plate 11A using a heat-resistant adhesive or adhesive.

In this state, the vacuum between the panel supporting member G and the pressure sheet member P is reduced by connecting the suction pads 5, 5A to the vacuum pump 9. Due to the suction and pressure reduction, the space defined by the panel support member G and the pressure sheet member P (inside the annular packing 15) and the air inside the glass panel W are sucked and the pressure is reduced, and the flexible sheet 14 is set to the atmospheric pressure. , And is brought into close contact with the upper surface of the pressing plate H. Further, the entire surface including the peripheral ends of the glass substrates 20 and 21 is uniformly pressed to form a gap.
In addition, the frame plate 13 is turned into the annular packing 15 by this suction pressure reduction.
, The suction pads 5, 5A are also closely attached to the tray 11, and the assembly frame F, the panel supporting member G, the pressing plate H, and the pressing sheet member P are integrally held by suction. .

Next, the above-mentioned suction and pressure reduction is continued, and when the internal pressure reaches a predetermined pressure, the integrally held jig is put into a hot air circulating oven M and heated for a required time (about 1 to 2 hours) (about 150 ° C.). ) To cause the sealing material 23 to react and harden. The jig may be placed in the hot-air circulation oven even before the start of suction and pressure reduction. In this case, it is necessary to prepare a vacuum pipe and its coupler in the hot-air circulation oven. At this time, since the upper and lower surfaces of the glass panel are made of a material having a thermal expansion coefficient close to that of the glass panel, and an intermediate sheet Q having a small friction coefficient is interposed, the thermal expansion of the jig is performed. And the upper and lower glass substrates expand substantially in the same manner, so that an empty cell of the liquid crystal panel without displacement can be obtained. Further, since the holding plate 11A is provided, the amount of deflection of the glass panel is reduced, and the displacement due to warpage can be reduced. Thereafter, the jig is taken out of the hot-air circulation oven M (or not taken out and the whole oven is cooled), and when the temperature of the glass panel W falls to about room temperature, the suction of the vacuum pump unit 9 is cut off, and the pressure sheet member P and the pressing plate are cut off. H is removed, the glass panel W with the gap set out is taken out, and the gap setting operation is completed. In some cases, the vacuum pump 9 may be shut off before natural cooling. When the outer dimensions of the glass panel W for which the gap is to be changed are changed, the sizes of the pressing plate H, the annular spacer 12, the holding plate 11A, and the annular spacer 12 are also changed. The reason is that the pressing plate H needs to contact the entire surface of the glass panel W. If the space between the annular spacer 12 and the glass panel W is too large, the flexible sheet 14 directly adheres to the upper surfaces of the holding plates 11A and 11 by suction pressure reduction, thereby preventing the inside suction pressure reduction from being lost. To do that.

[0012]

As is clear from the above description, the present invention can cope with a change in the size of the glass panel only by changing the size of the pressing plate and the annular spacer. Available. In addition, since high-pressure heating is performed while minimizing the effects of thermal expansion and the warpage due to the configuration of the jig, it is possible to obtain a high-quality liquid crystal panel with less displacement when the sealing resin is cured.

[Brief description of the drawings]

FIG. 1 is a front view showing a gap setting jig placed in a hot air circulation oven.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2, 2A Support leg 4, 4A Placement member 5 Suction pad 9 Vacuum pump 10 Vent hole 11 Receiving tray 11A Holding plate 12 Ring spacer 13 Frame plate 14 Flexible sheet 15 Ring packing 16 Sheet packing F Assembly frame G Panel support member H Press plate P Press sheet member Q Intermediate sheet W Glass panel

Claims (7)

[Claims] 1. A pair of left and right supporting legs erected on both ends of an upper portion of a substrate, a pair of mounting members provided inside the pair of supporting legs so as to face each other, and a lower portion of the mounting members of the pair of supporting legs. An assembling frame, the tip of which is protruded slightly higher than the mounting surface of the mounting member, and a suction pad that communicates with a vacuum source; and a size that can be mounted on the pair of mounting members. A tray formed and having a suction hole vertically penetrating at a position corresponding to the suction pad, an annular spacer fixed to the upper inside of the suction hole of the tray, and fixed to the tray by the annular spacer. A panel supporting member consisting of a holding plate having good thermal conductivity and rigidity and high plane accuracy; and having the same outer dimensions as a glass panel placed on the holding plate, Good conductivity and high rigidity A press plate having high flatness and high accuracy; a frame-shaped frame plate placed on the upper portion of the tray, and a flexible sheet stretched inside the lower surface of the frame plate while maintaining airtightness. A pressurizing sheet member provided with an annular packing around the lower surface of the frame plate. 2. The holding plate and the pressing plate,
The jig according to claim 1, wherein the jig has a thermal expansion coefficient of 0.05 to 3 times the thermal expansion coefficient of the glass panel. 3. To reduce frictional force between the tray of the gap setting jig and the holding plate, between the holding plate and the glass panel, and between the glass panel and the pressing plate. 3. The jig according to claim 1, wherein at least one intermediate sheet is interposed between the jigs. 4. The sheet according to claim 1, wherein the intermediate sheet is any one of a fluororesin sheet, a silicon rubber sheet, a glass cloth, a fluororesin impregnated glass cloth, and a fluororesin porous sheet. 3. The gap setting jig according to 3. 5. The annular spacer has a stepped portion,
The depth of the stepped portion is 0.2 times greater than the sum of the thickness of the holding plate and the thickness of the intermediate sheet interposed therebetween.
4. The jig according to claim 3, wherein the jig is deepened by about mm. 6. A thickness of a protruding portion of the annular spacer is in a range of about ± 1 mm with respect to a thickness of a glass panel, a pressing plate, and an intermediate sheet. 3. The gap setting jig according to 3. 7. The assembly frame according to claim 1, wherein a pair of mounting members and a suction pad are arranged in a plurality of stages with a vertical interval with respect to said support legs. The jig for setting a gap according to any one of claims 1 to 6.