WO2009118959A1

WO2009118959A1 - Glass plate breaking method and glass plate breaking device

Info

Publication number: WO2009118959A1
Application number: PCT/JP2008/072091
Authority: WO
Inventors: 勢津夫内田
Original assignee: 日本電気硝子株式会社
Priority date: 2008-03-25
Filing date: 2008-12-04
Publication date: 2009-10-01
Also published as: KR20100136958A; CN101910075B; JP5376282B2; TW200940463A; CN101910075A; KR101462976B1; JP2009227550A; TWI434813B

Abstract

When a glass plate (1) is divided along a scribe (S) serving as a starting point by providing the front surface of the glass plate (1) with the scribe (S), having the glass plate (1) supported by a supporting means (2) in such a manner that the scribe (S) is located near one end (2X) of the supporting means (2) and the glass plate projects beyond the one end (2X) of the supporting means (2), and then applying an external force to the projecting part of the glass plate (1) while having the glass plate (1) fixed to the supporting means (2) by a fixing means (3), the following relation: 1.3 ≤ B/A ≤ 1.7 is satisfied, assuming that the position at which an external force is applied to the glass plate (1) is a force point (4X), one end of the fixing means (3) existing on the one end (2X) side of the supporting means (2) is a fixed end (3X), the distance from the force point (4X) to the one end (2X) of the supporting means (2) is (A), and the distance from the fixed end (3X) to the one end (2X) of the supporting means (2) is (B).

Description

Glass plate folding method and glass plate folding device

The present invention relates to a glass plate folding method and a glass plate breaking device, and more specifically, a state in which a scribing is put on the surface of the glass plate and one side region of the glass plate is supported on a flat surface of the supporting means. Thus, the present invention relates to a glass plate splitting method and a splitting device that apply an external force to the other side region and divide the glass plate with the scribe as a starting point.

As is well known, various glass plates represented by glass substrates for flat panel displays such as liquid crystal displays, plasma displays, electroluminescence displays, and field emission displays are cut to the required size according to the application after molding. It is customary. As a cutting method for that purpose, a scribing (ruled line) is engraved on the surface of the glass plate with a diamond cutter or a laser in accordance with the required size, and the glass plate is folded along the scribe. The split method has been frequently used.

Considering the variation of the scribes engraved on the surface of the glass plate when this folding method is adopted, first, at the stage of engraving the scribe, the median that is substantially perpendicular to the surface of the glass plate There are cracks and lateral cracks along the surface of the glass plate. And, when a force that tears the glass plate on both sides with the scribe as a boundary acts, as shown in FIGS. 6A and 6B, the tensile stress on the left and right sides concentrates on the tip X of the median crack Sm of the scribe, When the median crack Sm extends in the thickness direction and advances, and the median crack Sm reaches the back surface of the glass plate 10, the glass plate 10 is cut.

This splitting method not only divides the glass sheet into two areas (two necessary parts) that will be products in the future, but also separates the glass sheet into one necessary part and a small unnecessary part at the end. It is also used when dividing. Explaining the latter as an example, basically, as shown in FIG. 7, a necessary part (first region) 10 A of the glass plate 10 in which the scribe S 1 is put (engraved) on the surface side. Is supported from the back side by the support means 20 comprising the support member 20a and the support jig 20b, and an unnecessary portion protruding from one end 20X of the support means 20 (the contact end 20bx of the support jig 20b to the glass plate 10). (Second region) 10B is pushed down from the surface side by the pushing jig 40, so that the cutting is performed with the scribe S1 as a starting point. In this case, it is preferable that the engraved position of the scribe S1 on the surface of the glass plate 10 coincides with the one end 20X of the support means 20.

As a specific example of such a folding method, according to the following Patent Document 1, a glass plate with a cut line (scribe) ruled on the upper surface is placed on a mounting table or a conveying means (support member). From the bottom of the projection of the glass plate, the lower support means (support jig) is raised and brought into contact with the lower surface of the glass plate along the scribe, and from the scribe of the glass plate In addition, a method is disclosed in which a glass plate is cut and cut along a scribe by lowering an upper pressing means (a pressing jig) from above to contact and pressing the protruding end side.

Moreover, according to the following patent document 2, while making the edge of the glass plate by which the scoring line (scribe) was provided on the upper surface protruded from the edge part of a conveyance conveyor (support member), rather than the scribe of a glass plate With the opposite edge side supported from below by the lower pressing member (supporting jig), the upper pressing member (pressing jig) is lowered in an arc from the diagonally upper side of the scribe so that the edge side is closer to the edge than the scribe of the glass plate. A method of breaking and cutting a glass plate by pushing down is disclosed.

Further, according to the following Patent Document 3, the edge of the glass plate having a scoring line (scribe) on the upper surface is projected from the edge of the table (support member), and the glass plate is scribed on the table. In a state where the glass plate is pressed and fixed in parallel, a method is disclosed in which the glass plate is broken and cut by raising the edge side of the glass plate from the scribe above the table.

JP 2006-321695 A JP-A-8-253336 Japanese Patent Laid-Open No. 7-237929

By the way, when a method of cutting a glass plate by splitting is adopted, conventionally, at the cut end portion, such as “scratch”, “chip”, “corner”, “escape”, “sag”, etc. It was in a situation where there were frequent defects. Among these defects, as shown in FIG. 8, the “sedge” is that the unreasonable protrusion 10AX remains at the cut end of one glass plate 10A after cutting, whereas the other glass plate 10B is cut. The disadvantage is that there is an unjustified missing portion 10BX at the end.

In that case, the folding method disclosed in the above-mentioned

Patent Documents

1, 2, and 3 is based on the basic principle that a glass plate is scribed and stress concentration due to tensile stress is applied to the median crack of the scribe. Therefore, it is presumed that the point of avoiding the occurrence of “hame chipping” among the above-mentioned defects can be expected.

However, the present inventors have confirmed that the occurrence of “chip”, “corner”, “escape”, and “sag” cannot be avoided even by the folding method disclosed in each of these documents. It came to do. In particular, when the above-mentioned “warping” occurs, the projection 10AX of one glass plate 10A can be excised in the end surface polishing step, but has a drawback that it takes a long time for end surface polishing, and the other glass The missing portion 10BX of the plate 10B cannot be completely removed even if the end face polishing process is performed, and a fatal problem in terms of quality arises in that a part remains.

The reason for the occurrence of “sagging” is that the position where the external force from the pushing jig or the like acts on the protruding portion of the glass plate supported by protruding from the one end by the support means is not appropriate. The present inventors have come to know that the bending moment does not act evenly in the vicinity of both sides. In other words, when the median crack of the scribe advances in the thickness direction of the glass plate due to the bending moment, the balance of the stress acting on both sides of the median crack is distorted, and the straightness of the median crack in the thickness direction is hindered. I came to get the knowledge.

Considering such matters, the point of action of the external force from the support means to the glass plate protrusion at the time of splitting is important, but in the present situation, no consideration has been made on such matters. is there.

In view of the above circumstances, the present invention appropriately sets the positional relationship between an external force acting on a glass plate on which a scribe is inserted at the time of splitting, a supporting means for supporting the glass plate, and a fixing means for fixing the glass plate to the supporting means. Therefore, it is an object of the present invention to provide a glass plate breaking method and a glass plate breaking device in which an unjustified defect does not occur at the cut end.

As a result of diligent efforts, the inventor has protruded from one end of the support means for supporting the glass plate on which the scribe is put, one end of the fixing means for fixing the glass plate to the support means, and one end of the support means. If the positional relationship with the point of application of external force to the glass plate part that satisfies the specified condition, it will be found that no undue defects will occur at the cut edge of the glass plate after splitting. Based on this, the present invention has been completed.

From such a point of view, the method according to the present invention, which was created to solve the above technical problem, includes scribing the surface side of the boundary between the first region and the second region of the glass plate, A part or all of the first region of the glass plate is supported by the support means, and when the support is supported, part or all of the second region of the glass plate is projected from one end of the support means and the scribe is supported. An external force is applied to the second region of the glass plate from the surface side in a state where the glass plate is positioned around one end of the device and the first region of the glass plate is fixed to the support device by the fixing device. In the glass plate splitting method in which the scribe is used as a starting point, the position where an external force is applied to the second region of the glass plate is the force point, and one end of the fixing means existing on one end side of the support means is the fixed end. In A distance A from the power point to one end of the support means and a distance B from the fixed end to one end of the support means satisfy the relationship of 1.3 ≦ B / A ≦ 1.7. .

According to such a configuration, the distance B is longer than the distance A by a predetermined length on the basis of one end of the support means. As such, the end of the support means is placed at the center between the fixed end and the force point. By deviating from the position to the force point side, a phenomenon occurs in which stress is evenly generated on the fixed end side and the force point side of the glass plate around the one end of the support means. And since there is a scribe of the glass plate around one end of the support means, the stress (or bending moment) generated on both sides of the scribe is also equalized, and at the cut end of the glass plate after folding. Inappropriate disadvantages, especially the above-mentioned “baldness” are less likely to occur. That is, conventionally, if one end of the support means is arranged in the vicinity of the center position between the fixed end and the force point, it tends to be considered that equal stress is generated on both sides of the scribe of the glass plate. However, the present inventor has come to find the above numerical range after recognizing that such an idea itself is based on misunderstanding. Accordingly, when the B / A is less than 1.3, the conventional positional relationship is approached, so that the stress generated on both sides of the scribe of the glass plate is not uniform, while the B / A is 1. On the other hand, if it exceeds 7, it is too far from the conventional positional relationship and deviates beyond the proper range, and the stress on both sides of the scribe becomes non-uniform. For this reason, by deviating one end of the glass plate support means by an appropriate amount from the center position between the fixed end and the force point, an unjustified defect of the cut end represented by “sedge” is unlikely to occur. In the end surface polishing step, the cut end portion can be processed smoothly and accurately.

In this case, the support means may be a support member having a support surface, and one end of the support means may be one end of the support member having the support surface.

In this way, the support means can be constituted only by a support member having a support surface such as a support table or a conveyer, and the number of parts of the folding device can be reduced, and the configuration can be simplified. It becomes possible.

Further, the support means includes a support member having a support surface and a support jig disposed apart from the support member, and one end of the support means is applied to the glass plate of the support jig. It may be a close end.

In this way, it is possible to smoothly perform the splitting by effectively using the contact end of the support jig provided separately from the support member having the support surface.

On the other hand, it is preferable that the distance that the scribe is biased from one end of the support means toward the force point and the distance that the scribe is biased toward the fixed end are both within 40% of the distance A.

That is, the scribing of the glass plate can be broken without causing an unjustified defect such as the above-mentioned “bending” at the cut end without matching the position with one end of the supporting means. This eliminates the need for strict positioning and simplifies the work. In that case, if the deviation distance to the force point side and the fixed end side of the scribe is not within 40% of the above-mentioned distance A, not only will there be a problem in smooth folding, but the cut end portion May cause undue drawbacks.

Further, it is preferable that the first region of the glass plate is a necessary part and the second region is an unnecessary part. Here, “necessary part” means a part to be a product in the future, and “unnecessary part” means a part to be disposed of.

In this way, since the area of the unnecessary part is narrower than the necessary part, the numerical limitation of 1.3 ≦ B / A ≦ 1.7 is effective, and the area of the necessary part is maximized without waste. It is possible to secure it to the limit.

Further, it is preferable that the glass plate has two orthogonal sides of 1000 mm or more and a thickness of 3 mm or less, and the unnecessary portion is a region having a width of 20 to 50 mm along one side.

In this way, the above numerical limitation of 1.3 ≦ B / A ≦ 1.7 can be utilized more effectively.

Further, the fixing means may be a negative pressure suction means for generating a negative pressure suction force on the surface side of the support means, or arranged on the surface side of the glass plate so as to attach the glass plate to the support means. It is also possible to use a holding jig that is pressed against and extends in a direction parallel to the scribe.

That is, the fixing means for fixing the glass plate to the supporting means is not particularly limited as long as it plays its role. Is advantageous.

Further, the means for applying an external force to the second region of the glass plate may be a pushing jig arranged on the surface side of the glass plate and extending in a direction parallel to the scribe.

Also in this case, the means for applying an external force to the second region of the glass plate is not particularly limited including the directionality to which the external force is applied, but if it is as described above, more reliable folding is performed. This is advantageous.

The glass plate which is the target of the splitting method having the above configuration can be a glass substrate for a flat panel display.

In this way, the above-described effects can be obtained reliably and remarkably after appropriately dealing with the recent increase in thickness and thickness of glass substrates for flat panel displays.

On the other hand, an apparatus according to the present invention, which was created to solve the above technical problem, has a scribe on the surface side of the boundary between the first region and the second region of the glass plate, and the first region of the glass plate. A part or the whole of the glass plate is supported by the support means, and when the support is supported, a part or the whole of the second region of the glass plate is protruded from one end of the support means and the scribe is provided around one end of the support means. And by applying an external force from the surface side to the second region of the glass plate in a state where the first region of the glass plate is fixed to a part of the support means by the fixing means. In the glass plate splitting apparatus configured to divide the scribe as a starting point, a position where an external force is applied to the second region of the glass plate is a force point, and one end of the fixing means existing on one end side of the support means is fixed. In the case of an end, the distance A from the power point to one end of the support means and the distance B from the fixed end to one end of the support means satisfy the relationship of 1.3 ≦ B / A ≦ 1.7. It is characterized by being configured to satisfy.

According to such a configuration, it is possible to receive the same advantages as those already described with respect to the basic configuration of the above-described glass sheet folding method.

As described above, according to the present invention, by fixing one end of the support means in an appropriate direction from the center position between the fixed end and the force point, the fixed end side and the force point side of the glass plate around the one end of the support means. The stress generated evenly on both sides of the scribing of the glass plate existing around one end of the supporting means is also equalized, which is an unjustified defect at the cut end of the glass plate after folding. In particular, it becomes difficult to produce “baldness”.

It is a schematic longitudinal side view of the glass plate folding apparatus which concerns on 1st embodiment of this invention. It is a schematic perspective view of the glass plate folding apparatus which concerns on 1st embodiment of this invention. It is a schematic longitudinal side view of the glass plate folding apparatus which concerns on 2nd embodiment of this invention. It is a schematic longitudinal side view of the glass plate folding apparatus which concerns on 3rd embodiment of this invention. It is a schematic longitudinal side view of the glass plate folding apparatus which concerns on 4th embodiment of this invention. It is a principal part expansion vertical side view of the glass plate for demonstrating the conventional problem. It is a principal part expansion vertical side view of the glass plate for demonstrating the conventional problem. It is a general | schematic longitudinal side view of the conventional general glass plate folding apparatus. It is a principal part expansion vertical side view of the glass plate for demonstrating the conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass plate 1A 1st area | region 1B 2nd area | region 2 Support means (support member)
2X One end of support means 3 Fixing means (holding jig)
3X Fixed end 4 Pushing jig (Folding jig)
4X Force point 5 Fixing means (negative pressure suction means)
5X Fixed end A Distance from the force point to one end of the support means B Distance from the fixed end to one end of the support means S Scribe

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in the following embodiment, the case where a glass plate is a glass substrate for flat panel displays, especially a glass substrate used for a liquid crystal display or a plasma display is illustrated.

FIG. 1 is a schematic longitudinal side view showing a glass sheet folding apparatus (implementation status of a glass sheet breaking method) according to the first embodiment of the present invention, and FIG. 2 is a schematic perspective view thereof, In the embodiment, the scribe S is put on the surface side of the boundary portion between the first region 1A that is a necessary portion of the glass plate 1 and the second region 1B that is an unnecessary portion. The first region 1A of the glass plate 1 is supported on the surface of a support member (support means) 2 having a support surface made of a support plate or a conveyor, and in the supported state, the second region 1B of the glass plate 1 is supported. However, it protrudes from one end (right end) 2X of the support member 2 and the scribe S is located immediately above the one end 2X of the support member 2. Further, on the surface side of the support member 2, a holding jig 3 as a fixing means for fixing a part of the first region 1 A of the glass plate 1 to the support member 2 is disposed. On the front surface side of the second region 1B, a pressing jig (folding jig) 4 for applying an external force to the back surface side of the second region 1B is disposed.

In this case, the glass plate 1 has a substantially rectangular shape, two orthogonal sides are each 1000 mm or more and a thickness is 3 mm or less, and the second region 1B is on one side (side parallel to the scribe S). The area is 20 to 50 mm wide. The pressing jig 3 extends in a direction parallel to the scribe S to press the first region 1A of the glass plate 1 over the entire length in the same direction, and the pressing jig 4 is parallel to the scribe S. An external force is applied to the second region 1B of the glass plate 1 over the entire length in the same direction.

Here, as shown in FIG. 1, in the state where the first region 1 A of the glass plate 1 is fixed to the surface of the support member 2 by the pressing jig 3, the pressing jig is inserted into the second region 1 B of the glass plate 1. When an external force is applied by 4 and the glass plate 1 is broken with the scribe S as a starting point, the following position setting is made. That is, the position where the pressing jig 4 applies an external force to the second region 1B of the glass plate 1 is the force point 4X, and one end (right end) of the pressing jig 3 existing on the one end 2X side of the support member 3 is the fixed end 3X. In addition, the distance A from the force point 4X to the one end 2X of the support member 2 and the distance B from the fixed end 3X to the one end 2X of the support member 2 satisfy the relationship of 1.3 ≦ B / A ≦ 1.7. Is set to

Accordingly, the one end 2X of the support member 2 is biased toward the force point 4X side from the center position of the fixed end 3X and the force point 4X. Stress is uniformly generated on the fixed end 3X side and the power point 4X side of the glass plate 1 around the one end 2X. Since the scribe S is present immediately above the one end 2X of the support member 2, the stresses generated on both sides of the scribe S are also equalized, and the pushing jig 4 is pushed downward (vertically downward). An unjustified defect, in particular, the above-mentioned “sagging” hardly occurs at the cut end portion of the glass plate 1 after the accompanying folding.

In this case, the scribe S engraved on the glass plate 1 does not necessarily have to be positioned immediately above the one end 2X of the support member 2 as shown in the drawing, and is within a range of 40% of the distance A described above. If there is, the scribe S is such that even if the support member 2 is deviated from the one end 2X to the fixed end 3X side or the force point 4X side, an unjustified defect is not generated at the cut end portion of the glass plate 1 after breaking. Stress is generated evenly on both sides of the.

FIG. 3 is a schematic longitudinal sectional side view showing a glass sheet breaking apparatus (implementation status of the glass sheet breaking method) according to the second embodiment of the present invention. The glass plate folding apparatus according to the second embodiment is different from the first embodiment described above in that the fixing means for fixing the glass plate 1 to the support member 2 is a negative pressure suction force on the surface side of the support member 2. It is a point comprised by the negative pressure suction means 5 which generate | occur | produces. This negative pressure suction means 5 is mainly composed of a large number of through holes 5a formed in the support member 2 and a negative pressure source device (not shown) for evacuating through these through holes 5a. In this case, one end (right end) of the negative pressure suction means 5 existing on the one end 2X side of the support member 2 becomes the fixed end 5X, and the distance A from the force point 4X to the one end 2X of the support member 2 and the fixed end 5X. Is set so as to satisfy the relationship of 1.3 ≦ B / A ≦ 1.7. Since the other configuration is the same as that of the first embodiment described above, the same reference numerals are given to the common components, and the description thereof is omitted.

FIG. 4 is a schematic longitudinal side view showing a glass plate breaking apparatus (implementation status of the glass plate breaking method) according to the third embodiment of the present invention. The glass plate folding apparatus according to the third embodiment is different from the first embodiment described above in that a pressing jig (folding jig) 4 for applying an external force to the second region 1B of the glass plate 1 is A jig having a U-shaped cross section that sandwiches the edge (right edge) of the second region 1B, and the pushing jig 4 rotates downward with the one end 2X of the support member 2 as a fulcrum (pushing jig) 4 may be configured to descend vertically downward). In this case, the contact point between the left end portion of the pushing jig 4 and the surface of the second region 1B of the glass plate 1 serves as a force point 4X. The distance A to 2X and the distance B from the fixed end 3X to the one end 2X of the support member 2 are set so as to satisfy the relationship of 1.3 ≦ B / A ≦ 1.7. Since the other configuration is the same as that of the first embodiment described above, the same reference numerals are given to the common components, and the description thereof is omitted. In the third embodiment as well, the fixing means may be a negative pressure suction means as in the second embodiment.

FIG. 5 is a schematic longitudinal sectional side view showing a glass sheet breaking apparatus (implementation status of the glass sheet breaking method) according to the fourth embodiment of the present invention. The glass plate folding apparatus according to the fourth embodiment is different from the first embodiment described above in that the support means 2 for supporting the glass plate 1 from the back side has a support surface made of a support plate or a conveyor. The support member 2a has a support member 2a, and a support jig 2b that is disposed to the right from one end 2ax of the support member 2a and that has a tip abutting against the back surface of the glass plate 1. In this case, the contact end 2bx of the support jig 2b to the back surface of the glass plate 1 corresponds to one end 2X of the support means 2, and the distance A from the force point 4X to the one end 2X of the support means 2 The distance B from the fixed end 3X to the one end 2X of the support means 2 is set so as to satisfy the relationship of 1.3 ≦ B / A ≦ 1.7. Since the other configuration is the same as that of the first embodiment described above, the same reference numerals are given to the common components, and the description thereof is omitted. In the fourth embodiment as well, the fixing means may be a negative pressure suction means as in the second embodiment described above.

Next, when the present inventor satisfies the above relationship of 1.3 ≦ B / A ≦ 1.7, the inventors have found a matter that an unjustified defect does not occur at the cut end portion after the glass plate 1 is folded. An outline of the experiment will be described.

That is, in the embodiment shown in FIG. 1, by maintaining the distance A at 50 mm and changing the distance B, the value of B / A is changed, the pushing jig 4 is lowered, and the glass plate 1 is folded. After doing, it was inspected whether an unjustified defect occurred at the cut end. The experimental results are shown in Table 1 below as Experiments 1-7. In Table 1 below, “◎” in the column of the occurrence state of shave indicates that almost no shave was observed, and “◯” indicates a problem caused by performing end face processing such as an end face polishing process. “X” indicates that the shaving remaining as a deformed shape was observed even after the end face processing was performed.

According to Table 1 above, if the value of B / A is 1.3 or more and 1.7 or less, the bending of the extent that does not cause a problem by performing the end face treatment after the glass plate 1 is broken is cut. It was understood that it only occurred at the edge.

Next, in the same manner as shown in FIG. 1, the distance A is changed and the distance B is also changed so that the value of B / A is within the range of 1.3 or more and 1.7 or less ( After the pushing jig 4 was lowered and the glass plate 1 was folded, it was inspected whether or not an unjustified defect occurred at the cut end. . The experimental results are shown in Table 2 below as Experiments 8 to 12. In Table 2 below, “◎” in the column of the occurrence of warping represents the same items as in Table 1 above.

According to Table 2 above, even when the distance A is changed, if the value of B / A is 1.3 or more and 1.7 or less, the cut end of the glass plate 1 after splitting I was able to grasp that the generation situation of the stubble in the club did not get worse.

Here, positioning the scribe S of the glass plate 1 directly above the one end 2X of the support member (support means) 2 is performed by a predetermined positioning device or manually, but the alignment is surely performed. In addition to being extremely difficult, if the positioning accuracy is to be improved, the apparatus becomes complicated, expensive, and complicated, which causes inconvenience. Therefore, in the embodiment shown in FIG. 1, the fixed end 3X, the one end 2X of the support member 2 and the force point 4X are maintained at fixed positions that satisfy the above numerical limitation, and the position of the scribe S is set to the support member 2. An experiment was conducted to bias the one end 2X from the one end 2X toward the fixed end 3X and the force point 4X. In this case, the distance A was 50 mm, the distance B was 75 mm, and the thickness of the glass plate 1 was 0.7 mm. The experimental results are shown in Table 3 below as Experiments 13-17. In Table 3 below, the sign “+” in the column of the amount of deviation from the end of the support member (the amount of deviation from the one end 2X of the support member 2) is the state where the scribe S is biased toward the force point 4X, the sign “ “-” Indicates a state of being deviated toward the fixed end 3X side, and “◯” and “◎” in the column of the occurrence state of the bending indicate the same items as in Table 1 above.

According to Table 3 above, even if the scribe S of the glass plate 1 is biased from the one end of the support member 2 to the force point 4X side and the fixed end 3X side by a length corresponding to 30% of the distance A, Even if almost no occurrence is observed, and even if the amount of deviation is 40% of the distance A, it is understood that only a degree of warping that does not cause a problem is observed by performing end face processing such as an end face polishing process. did.

The experimental results shown in Table 1, Table 2, and Table 3 were obtained not only in the embodiment shown in FIG. 1, but also in the embodiments shown in FIGS.

Claims

When a scribing is made on the surface side of the boundary between the first region and the second region of the glass plate, a part or all of the first region of the glass plate is supported by the supporting means, and the glass when the glass is supported. A part or all of the second region of the plate is protruded from one end of the support means, the scribe is positioned around one end of the support means, and the first region of the glass plate is fixed to the support means by the fixing means. In a state of being fixed to a part, by applying an external force from the surface side to the second region of the glass plate, in the glass plate folding method for dividing the glass plate from the scribe as a starting point,
When a position where an external force is applied to the second region of the glass plate is a force point, and one end of the fixing means existing on one end side of the support means is a fixed end, a distance A from the force point to one end of the support means The glass plate folding method, wherein a distance B from the fixed end to one end of the support means satisfies a relationship of 1.3 ≦ B / A ≦ 1.7.
The glass plate folding method according to claim 1, wherein the support means is a support member having a support surface, and one end of the support means is one end of a support member having the support surface.
The support means includes a support member having a support surface and a support jig that is spaced apart from the support member, and one end of the support means is a contact end of the support jig to the glass plate. The glass plate folding method according to claim 1, wherein:
The distance that the scribe is biased from one end of the support means toward the force point and the distance that the scribe is biased toward the fixed end are both within 40% of the distance A. 4. The glass plate folding method according to any one of 1 to 3.
5. The glass sheet folding method according to claim 1, wherein the first region of the glass plate is a necessary part and the second region is an unnecessary part.
6. The glass plate according to claim 5, wherein two orthogonal sides are each 1000 mm or more and a thickness is 3 mm or less, and the unnecessary portion is a region having a width of 20 to 50 mm along one side. The glass plate folding method of description.
The glass plate folding method according to any one of claims 1 to 6, wherein the fixing means is a negative pressure suction means for generating a negative pressure suction force on a surface side of the support means.
The fixing means is a holding jig which is disposed on the surface side of the glass plate, presses the glass plate against the support means, and extends in a direction parallel to the scribe. The glass plate folding method according to any one of the above.
The means for applying an external force to the second region of the glass plate is a pressing jig disposed on the surface side of the glass plate and extending in a direction parallel to the scribe. The glass plate folding method described in 1.
10. The glass plate folding method according to claim 1, wherein the glass plate is a glass substrate for a flat panel display.
When a scribing is made on the surface side of the boundary between the first region and the second region of the glass plate, a part or all of the first region of the glass plate is supported by the supporting means, and the glass when the glass is supported. A part or all of the second region of the plate is protruded from one end of the support means, the scribe is positioned around one end of the support means, and the first region of the glass plate is fixed to the support means by the fixing means. In a state of being fixed to a part, by applying an external force from the surface side to the second region of the glass plate, the glass plate breaking device configured to divide the glass plate from the scribe as a starting point,
When a position where an external force is applied to the second region of the glass plate is a force point, and one end of the fixing means existing on one end side of the support means is a fixed end, a distance A from the force point to one end of the support means A glass plate folding apparatus, wherein the distance B from the fixed end to one end of the support means satisfies a relationship of 1.3 ≦ B / A ≦ 1.7.