WO2020129546A1

WO2020129546A1 - Glass plate warpage measurement device and glass plate manufacturing method

Info

Publication number: WO2020129546A1
Application number: PCT/JP2019/046088
Authority: WO
Inventors: 井上　肇; 西川　佳範
Original assignee: 日本電気硝子株式会社
Priority date: 2018-12-21
Filing date: 2019-11-26
Publication date: 2020-06-25
Also published as: JP7153231B2; CN113167574A; CN113167574B; JP2020101434A; KR20210098959A

Abstract

This invention comprises two main support members 2 for supporting a glass plate G from below and measures the warpage of the glass plate G between the two main support members 2. An intermediate support member 13 is disposed between the two main support members 2 and switches between supporting the glass plate G from below and being removed from the glass plate G.

Description

Glass plate deflection measuring device and glass plate manufacturing method

The present invention relates to a glass plate deflection measuring device, and more particularly, to a device that includes two support members that support a glass plate from below and measures the glass plate deflection that occurs between the two support members. The present invention also relates to a method for manufacturing a glass plate using the above measuring device.

As is well known, a glass plate used for a substrate of a thin display device such as a liquid crystal display or an organic EL display or a sensor, or a substrate of a thin film compound solar cell is required to be free from fine defects and scratches. It

However, under the present circumstances where the glass plate is being made larger and thinner, the bending that occurs in the glass plate becomes larger. Therefore, there is a possibility that the glass plate may come into contact with the transportation facility during transportation and may be damaged. Therefore, it is important to measure the bending of the glass plate.

As an example of a method for measuring the bending of a glass plate, two supporting members that support the glass plate from below are provided, and the bending of the glass plate that occurs between the two supporting members is measured (for example, a patent document). Reference 1).

JP, 2009-117301, A

However, as described above, according to the method of supporting the glass plate from below by the two supporting members and measuring the bending of the glass plate, in the process of placing the glass plate on the two supporting members in the pre-measurement step. However, the following problems occur.

That is, when the glass plate held by a hand or the like is placed on the two supporting members for measurement, the flat glass plate is warped in a convex or concave shape by an external force such as its own weight or a force accompanying holding. Then, the upper ends of the two support members are brought into contact with each other, and the deflection measurement is started. In this case, a warp due to an external force causes a deviation or deviation in the support mode of the glass plate (for example, the contact position with the support member or the attitude of the glass plate), and as a result, the measurement at the time of measuring the bending of the glass plate The error may increase. This measurement error is likely to occur due to individual differences among workers because it requires proficiency in the work of placing the glass plate held by a hand or the like on the two support members.

From the above point of view, the present invention suppresses the occurrence of deviation or deviation in the support mode of the glass plate in the process of placing the glass plate on the support member, and reduces the measurement error when measuring the bending of the glass plate. The task is to do.

The present invention, which was devised to solve the above-mentioned problems, comprises two main supporting members that support a glass plate from below, and is configured to measure the bending of the glass plate that occurs between the two main supporting members. It is characterized in that an intermediate support member is provided between the two main support members so as to support the glass plate from below and retract it from the glass plate.

According to such a configuration, in the process of placing the glass plate on the two main supporting members, not only these main supporting members support the glass plate from below, but also the intermediate supporting member also supports the glass plate from below. Can be supported. Therefore, when the glass plate is brought into contact with (placed on) the upper ends of the two support members, the warp due to the external force can be reduced or eliminated by the intermediate support member. Then, after the glass plate is supported by the two main supporting members and the intermediate supporting member, if the intermediate supporting member is retracted from the glass plate, the bending of the glass plate caused between the two main supporting members can be measured. it can. As a result, in the process of placing the glass plate on the two main supporting members, it becomes difficult for the glass plate to be supported or displaced in deviation, and the measurement error during the bending measurement of the glass plate can be reduced. Also, the work of placing the glass plate held by hand on the two main support members and the intermediate support member can be easily performed by an unskilled worker, and the measurement error due to individual differences should be small. You can

In the above-mentioned structure, an intermediate support elevating means for moving the intermediate support member up and down is provided, and the intermediate support member supports the glass plate from below when the intermediate support member is in an upper position, and the intermediate support member is The intermediate support member may be retracted from the glass plate when the intermediate support member is located below the upper position.

In this way, the intermediate support member moves up and down by the operation of the intermediate support elevating means, and the intermediate support member takes a state of supporting the glass plate from below and a state of retracting from the glass plate. As a result, the structure for allowing the intermediate support member to assume two states is simplified, and the work for switching between the two states is automated, thus improving work efficiency and measurement accuracy.

In the above configuration, the upper end of the intermediate support member and the upper ends of the two main support members may be held at the same height when the intermediate support member is at the upper end position.

In this way, by raising the intermediate support member to the upper end position in the initial stage of the process of placing the glass plate on the two main support members, the glass plate is kept horizontal without warpage due to external force. Can be kept in a good state. This prevents a situation in which the glass plate slides over the two main supporting members in the initial stage, so that the deviation of the supporting position of the glass plate and the misalignment of the posture are more difficult to occur. Moreover, it is possible to easily recognize how much the glass plate bends from the horizontal state, and it is possible to quickly and accurately know the amount of bending of the glass plate.

In the above configuration, an image pickup means for picking up an end surface of the glass plate to be measured, an image pickup lifting means for moving the image pickup means up and down, a height measuring means for measuring the height of the image pickup means, Display means for displaying the image captured by the image capturing means may be provided. Here, the above-mentioned “end surface to be measured of the glass plate” means an end surface that is curved when the flat glass plate is bent (hereinafter, the same).

With this configuration, when the end surface of the glass plate to be measured moves due to the downward movement of the intermediate support member, the imaging means can be moved according to the moved distance. Moreover, since the image taken by the image pickup means is displayed on the display means and the height of the image pickup means can be measured by the height measuring means, the amount of bending of the glass plate can be recognized through the display means and the height measuring means. .. This eliminates the need to use a laser rangefinder or the like, and eliminates the need for careful and troublesome handling. Moreover, the laser range finder and the like are installed in the lower region and the upper region of the glass plate placed on the two main supporting members. Here, when a laser range finder or the like is installed in the lower region of the glass plate, problems such as interference with the intermediate support member may occur. Further, when the laser rangefinder or the like is arranged in the upper region of the glass plate, a problem such as interference with the glass plate may occur when the glass plate is moved onto the two main supporting members. However, according to the above configuration of the present invention, the image pickup means, the image pickup elevating means, and the display means can be arranged in the region excluding the lower region and the upper region of the glass plate. Therefore, problems such as interference with the intermediate support member and the glass plate do not occur, and the degree of freedom in layout of these means increases.

In the above configuration, the stopper for positioning the glass plate in a direction orthogonal to the end surface of the glass plate to be measured, and the stopper for moving the intermediate support member downward from the upper moving end position You may make it provide the stopper drive means to withdraw from a glass plate.

By doing this, in the process of placing the glass plate on the two support members, the presence of the stopper allows the glass plate to be easily and accurately placed in a flat posture. Thereby, the measurement error at the time of measuring the bending of the glass plate can be further reduced. Moreover, when the intermediate support member moves downward from the upper end position, the stopper retracts from the glass plate accordingly, so that the glass plate slides between the glass plate and the stopper in the process of bending. Etc. does not occur. This avoids the problems such as scratches on the glass plate and the problems that the proper and free bending of the glass plate is obstructed.

In this case, a scale for positioning the glass plate in a direction parallel to the end surface of the glass plate to be measured may be provided.

With this configuration, in the process of placing the glass plate on the two support members, not only the glass plate is positioned by the stopper in one direction, but also in the direction orthogonal to the one direction. Is also positioned using the scale. This makes it possible to more reliably reduce the measurement error when measuring the deflection of the glass plate.

In the above configuration, a main support drive means for moving at least one of the two main support members so that the two main support members approach and separate from each other may be provided.

By doing this, it is possible to appropriately measure the deflection of glass plates of various sizes, regardless of their size.

In this case, the main supporting drive means may be configured to move the two main supporting members symmetrically on both sides of the central position between them.

By doing this, even if the size of the glass plate is changed, the center position of the glass plate can be kept constant in the direction parallel to the end surface of the glass plate to be measured. Therefore, it becomes possible to perform the main work of the glass plate mounting work and the bending measurement work under the same conditions regardless of the size of the glass plate.

The present invention devised to solve the above problems is a method of manufacturing a glass plate including a preparing step of preparing a glass plate, and a measuring step of measuring the bending of the glass plate, in the measuring step, Deflection is measured using the above-described glass plate deflection measuring device, and the measuring step includes a step of supporting the glass sheet with the two main supporting members and the intermediate supporting member, and retracting the intermediate supporting member. And supporting the glass plate with the two main supporting members.

According to such a configuration, similarly to the above-described glass plate bending measuring device, the warp due to the external force can be reduced or eliminated by the intermediate supporting member, and the measurement error during the glass plate bending measurement can be reduced. it can. Therefore, the quality of the manufactured glass plate can be improved.

ADVANTAGE OF THE INVENTION According to this invention, in the process of mounting a glass plate on two main support members, it becomes difficult to generate|occur|produce a shift|offset|difference, a deviation, etc. in the support mode of a glass plate, and can reduce the measurement error at the time of bending measurement of a glass plate. it can.

It is a perspective view showing the whole composition of the bending measuring device of the glass board concerning the embodiment of the present invention. It is a top view which shows the whole structure of the bending measuring apparatus of the glass plate which concerns on embodiment of this invention. FIG. 3 is a vertical cross-sectional front view taken along line XX of FIG. 2, showing a state where a glass plate is not bent. FIG. 3 is a vertical sectional front view taken along line XX of FIG. 2, showing a state where a glass plate is bent. It is a principal part expanded side view which shows the effect|action of the deflection measuring apparatus of the glass plate which concerns on embodiment of this invention. It is a schematic front view which shows the screen of the display means which is a component of the bending|flexion measuring apparatus of the glass plate which concerns on embodiment of this invention. It is a schematic front view which shows the screen of the display means which is a component of the bending|flexion measuring apparatus of the glass plate which concerns on embodiment of this invention. It is a schematic front view which shows the screen of the display means which is a component of the bending|flexion measuring apparatus of the glass plate which concerns on embodiment of this invention.

A glass plate deflection measuring device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

(Device configuration)
FIG. 1 is a perspective view showing an overall configuration of a glass plate deflection measuring apparatus 1 according to the present embodiment, and FIG. 2 is a plan view showing a state where a glass sheet G is placed on the deflection measuring apparatus 1. is there. FIG. 3 is a sectional view taken along line XX of FIG. As shown in these drawings, the deflection measuring device 1 includes two main support members 2 that support the glass plate G from below, and measures the deflection of the glass plate G that occurs between the two main support members 2. Composed. The main support member 2 is a flat plate member that is long in the AA direction (hereinafter referred to as the vertical direction) and is held in an upright state. The position in AA direction and the height position of the main support member 2 are always kept constant. On the other hand, the position of the main support member 2 in the BB direction (hereinafter referred to as the horizontal direction) orthogonal to the vertical direction is changed by the main support drive means 3 when the size of the glass plate G is changed. To be done.

The main supporting drive means 3 has a drive mechanism 4 for moving the two main supporting members 2 along a straight line, and a guide mechanism 5 for guiding the movement of the two main supporting members 2. The drive mechanism 4 has a single drive shaft 7 extending in the horizontal direction at the center in the vertical direction on the surface plate 6. The drive shaft 7 is rotatably held by a bearing block 8 fixed to the upper surface 6 a of the surface plate 6. The bearing blocks 8 are arranged at a plurality of lateral positions (three positions in the illustrated example). The upper surface 6a of the surface plate 6 forms a horizontal plane. Further, the drive shaft 7 rotates in accordance with the rotation operation of the handle 9 attached to one end portion in the axial direction. Further, the drive shaft 7 has screw portions 7a at two axial positions, one screw portion 7a is formed with a right-hand thread and the other screw portion 7a is formed with a left-hand thread. Then, the nut 10 fixed to one main support member 2 is screwed into one screw portion 7a, and the nut 10 fixed to the other main support member 2 is screwed into the other screw portion 7a. With such a configuration, the feed directions of the two main support members 2 when the handle 9 is rotated in one direction are opposite to each other. Therefore, the two main support members 2 move symmetrically on both sides of the central position between them.

The guide mechanism 5 has two rails 11 spaced apart from each other in the longitudinal direction of the drive shaft 7. These rails 11 are fixed on the surface plate 6 so as to be parallel to the drive shaft 7. Further, L-shaped brackets 12 fixed to the two main support members 2 are slidably fitted to these rails 11, respectively. Therefore, when the two main support members 2 move in a straight line by the rotation of the drive shaft 7, the L-shaped bracket 12 also moves integrally on the rail 11.

Further, the deflection measuring device 1 includes an intermediate supporting member 13 arranged between the two main supporting members 2. The intermediate support member 13 is a plate member having an L-shaped cross section that is long in the vertical direction, and has an upright portion 13b upright from a bottom portion 13a. When the glass plate G is supported from below by the two main support members 2, the intermediate support member 13 takes a state of supporting the glass plate G from below and a state of being retracted from the glass plate G. Specifically, the glass plate G is supported from below by the rising portion 13b of the intermediate support member 13. The upright portions 13b are arranged in a central position between the two main support members 2.

The vertical position and the horizontal position of the intermediate support member 13 are always kept constant. On the other hand, the height position of the intermediate support member 13 is variable. More specifically, the intermediate support member 13 moves up and down by the operation of the intermediate support elevating means 14 installed on the surface plate 6. In the present embodiment, the intermediate support elevating means 14 is composed of a fluid pressure cylinder, particularly an air cylinder. The air cylinder 14 is mounted over the upper surface 6 a of the surface plate 6 and the bottom portion 13 a of the intermediate support member 13. Therefore, the intermediate support member 13 moves up and down as the piston rod of the air cylinder 14 projects and retracts.

It should be noted that both the portion of the upper end of the main support member 2 that comes into contact with the glass plate G and the portion of the upper end of the intermediate support member 13 (the upright portion 13b) that comes into contact with the glass plate G both have low friction with glass. Is formed of, for example, a polyimide resin, an aluminum alloy (for example, A5052P of Al—Mg alloy), a fluororesin, or the like.

The deflection measuring device 1 includes a stopper 15 that positions the glass plate G in the vertical direction. In this embodiment, the stoppers 15 are assembled to the two main support members 2, respectively. Specifically, the stopper 15 has a cylindrical shape, and one end face Ga of the glass plate G in the vertical direction can be brought into contact with the peripheral surface of the stopper 15. Further, a box-shaped body 16 is fixed to the inner surface of the main support member 2, and a stopper 15 is held on the box-shaped body 16 so as to be vertically movable. The stopper 15 moves in the vertical direction by the operation of the stopper driving means 17 installed on the main support member 2. In this embodiment, the stopper driving means 17 is composed of a fluid pressure cylinder, particularly an air cylinder. The air cylinder 17 is attached to the box-shaped body 16. Therefore, the stopper 15 moves in the vertical direction as the air cylinder 17 projects and retracts. The portion of the stopper 15 that contacts the glass plate G is formed of a wear-resistant organic resin such as a polyimide resin, a phenol resin, a fluororesin, or a polyamideimide resin.

Further, the deflection measuring device 1 includes a scale 18 that positions the glass plate G in the lateral direction. In the present embodiment, the scale 18 is fixed to the upper end portion of the outer surface of the main support member 2 on one side (the right side in each drawing) and extends outward in the lateral direction. On the upper surface of the scale 18, a plurality of straight lines 19 for enforcing a plurality of sizes of the glass plate G are engraved. The upper surface of the scale 18 is close to the lower surface of the glass plate G. Then, by making the end face Gb on the one side (the right side of each drawing) of the glass plate G in the lateral direction match any straight line 19 determined according to the size of the glass plate G in plan view, the glass plate G is Positioned laterally (see Figure 2). Note that this positioning is performed by the operator's visual observation in this embodiment.

Further, the deflection measuring device 1 includes an image pickup means 20 for picking up an image of an end face (end face to be measured) Ga on one side in the vertical direction of the glass plate G set on the main support member 2. In the present embodiment, the image pickup means 20 is composed of cameras, especially a CCD camera. The CCD camera 20 moves up and down by the operation of the image pickup elevating means 21. Specifically, the CCD camera 20 is mounted on a slider 22 of a digital height gauge 21 installed on the floor or the like. Therefore, in the present embodiment, the imaging elevating means 21 is composed of a digital height gauge. The slider 22 and the CCD camera 20 move up and down as the handle 23 is rotated. The rotation operation of the handle 23 is performed by an operator in this embodiment. The height of the CCD camera 20 is measured by a digital height gauge 21. Therefore, in this embodiment, the digital height gauge 21 also functions as height measuring means for measuring the height of the image pickup means 20. Further, the image captured by the CCD camera 20 is displayed on the display means 24 such as a TV monitor.

(Deflection measurement)
According to the deflection measuring device 1 having the above-described configuration, the intermediate support member 13 moves upward just before and immediately after the glass plate G is placed on the two main support members 2, as shown in FIG. It is at the end position. Therefore, the glass plate G at the time when the mounting work is started is supported from below by not only the main support member 2 but also the intermediate support member 13. The height position of the upper ends of the intermediate support members 13 at this point is the same as the height position of the upper ends of the two main support members 2. Therefore, the glass plate G at this time is supported from below by the main support member 2 and the intermediate support member 13 so as to be in a horizontal state. In this state, one end face Ga of the glass plate G on the one side in the vertical direction is brought into contact with the stopper 15, and the end face Ga on the one side of the horizontal direction is matched with one straight line 19 of the scale 18. This completes the positioning of the glass plate G in the vertical and horizontal directions. After that, the glass plate G is bent by its own weight by moving the intermediate support member 13 downward by the air cylinder 14 which is the intermediate support elevating means. Then, when the intermediate support member 13 reaches the lower end, as shown in FIG. 4, the intermediate support member 13 is retracted from the glass plate G (separated state). Strictly speaking, the intermediate support member 13 is in a state of being retracted from the glass plate G after the intermediate support member 13 starts moving downward and before reaching the lower end.

In this case, as shown by the chain line in FIG. 5, when the air cylinder 14 which is the intermediate support elevating means starts to move the intermediate support member 13 downward, the air cylinder 17 which is the stopper drive means is synchronized with this. The stopper 15 starts to move backward. Therefore, at the same time when the glass plate G begins to bend, the stopper 15 retracts from the glass plate G. Therefore, in the process of bending the glass plate G, the stopper 15 and the glass plate G do not interfere with each other.

In the flexure amount measurement, the glass plate G is placed on each of the

support members

2 and 13. The CCD camera 20 images the lowermost edge S of the end surface Ga to be measured, and the imaged image is displayed on the display means 24. As shown in FIG. 6A, an image of the end surface Ga of the glass plate G and a reference line 25 inserted in the center of the screen are displayed on the screen of the display means 24. At this time, by adjusting the height position of the slider 22 of the height gauge 21 by operating the handle 23, the lowermost edge S of the end face Ga and the reference line 25 are aligned as shown in FIG. 6B. The height position of the slider 22 at this time is set to the first zero point position.

After that, when the intermediate support member 13 moves downward and retracts from the glass plate G as shown in FIG. 4, the slider 22 is moved downward by operating the handle 23. Following this, the CCD camera 20 also moves down. Then, the height position of the slider 22 of the height gauge 21 is adjusted again by operating the handle 23. By this adjustment, as shown in FIG. 6C, the lowermost edge S of the end surface Ga of the glass plate G and the reference line 25 are matched. By reading the height position of the slider 22 at this time in relation to the first zero point position, the amount of bending of the surface of the glass plate G is measured.

Next, the glass plate G is inverted and placed on each of the

support members

2 and 13. After that, the intermediate support member 13 is moved downward in the same manner as described above, and the height position of the slider 22 of the height gauge 21 is adjusted. By this adjustment, as shown in FIG. 6C again, the lowermost edge S of the end surface Ga of the glass plate G and the reference line 25 are matched. By reading the height position of the slider 22 at this point in relation to the first zero point position, the amount of bending of the back surface of the glass plate G can be measured. The bending difference of the glass G is obtained from the difference between the bending amount of the front surface and the bending amount of the back surface.

Further, the measurement of only the difference in bending of the glass plate G is performed as follows, for example. First, the height position of the slider 22 at the time when the image shown in FIG. 6C is obtained is set as the second zero point position. Then, the intermediate support member 13 and the slider 22 are respectively moved upward and returned to their original positions. Next, the glass plate G is inverted and placed on each of the

support members

2 and 13. After that, the intermediate support member 13 is moved down and the slider 22 and the CCD camera 20 are moved down in the same manner as above. Further, the intermediate support member 13 is retracted from the glass plate G. In this state, the height position of the slider 22 is adjusted so that the lowermost edge of the end face Ga of the inverted glass plate G and the reference line 25 are aligned again as shown in FIG. 6C. By reading the height position of the slider 22 at this point in relation to the second zero point position, the difference in bending of the glass plate G can be measured.

When the above-described bending measurement (measurement of bending amount and bending difference) is performed on a plurality of glass plates G of the same size, and the size of the glass plates G is changed, the following work is performed. Be seen. When the size of the glass plate G becomes large, the handle 9 shown in FIG. 1 is rotated in one direction to move the two main support members 2 in directions away from each other. Further, when the size of the glass plate G becomes small, the handle 9 is rotated in the other direction to move the two main support members 2 in the directions approaching each other. The movement stop positions of the two main support members 2 in this case are determined according to a preset rotation angle of the handle 9 or a preset lateral position of the main support member 2. In this way, even when the two main support members 2 are installed at new positions in the lateral direction, the imaging means 20 and the imaging elevating means 21 are arranged at the central position between the two main support members 2. To be done. Therefore, it is not necessary to change the installation positions of the imaging unit 20 and the imaging lifting unit 21 (the installation positions of the CCD camera 20 and the height gauge 21 in this embodiment). It is not necessary to change the installation position of the display means 24. When the standing portions 13b of the intermediate supporting member 13 are arranged at the central positions between the two main supporting members 2 as in the present embodiment, the installation position of the standing portions 13b of the intermediate supporting member 13 need not be changed. I'm done. Further, with respect to the scale 18 shown in FIGS. 1 and 2, it suffices to select a different straight line 19 corresponding to the changed size of the glass plate G. Therefore, the horizontal positioning of the glass plate G is performed by matching the newly selected straight line 19 with the end surface Gb on one side in the horizontal direction of the size-changed glass plate G.

Here, the size of the glass plate G to be subjected to the flexure measurement by the flexure measuring device 1 is, for example, a lateral dimension of 200 to 600 mm and a longitudinal dimension of 300 to 700 mm. There are a plurality of sizes within the above range. In the illustrated example, the side along the horizontal direction of the glass plate G is the long side and the side along the vertical direction is the short side, but conversely, the side along the horizontal direction of the glass plate G is the short side. And the sides along the vertical direction may be long sides. The plate thickness of these glass plates G is 0.2 to 3.0 mm. Note that these glass plates G are cut into a plurality of sizes according to the physical properties of the glass such as Young's modulus and plate thickness. For example, as the plate thickness of the glass plate G becomes smaller, the size thereof is cut smaller.

(effect)
As described above, according to the deflection measuring apparatus 1 according to the present embodiment, in the process of placing the glass plate G on the two main supporting members 2, the main supporting members 2 support the glass plate G from below. In addition, the intermediate support member 13 also supports the glass plate G from below. Thereby, when the glass plate G is brought into contact with the upper ends of the two main support members 2, the presence of the intermediate support member 13 makes it difficult for the glass plate G to warp due to an external force. Therefore, the support mode of the glass plate G in the process of placing the glass plate G is less likely to be displaced or misaligned, and the measurement error in measuring the bending of the glass plate G can be reduced.

Further, according to the bending measuring apparatus 1 according to the present embodiment, the glass plate G is in a horizontal state due to the presence of the intermediate support member 13 in the initial stage of the process of placing the glass plate G on the two main support members 2. Held in. Therefore, in the initial stage, the glass plate G is prevented from slipping on the two main support members 2 and the like, so that the measurement error in measuring the deflection of the glass plate G can be further reduced.

Further, according to the deflection measuring device 1 according to the present embodiment, the intermediate support member 13 only moves up and down, and the intermediate support member 13 supports the glass plate G from below and retracts it from the glass plate G. And take. This simplifies the structure of the intermediate support elevating means 14 for causing the intermediate support member 13 to assume two states. Further, the work for switching between these two states is automated by the intermediate supporting elevating means 14 and the work efficiency is improved.

Moreover, according to the flexure measuring device 1 of the present embodiment, the stopper 15 is retracted from the glass plate G in the process of the flexure of the glass plate G, so that the space between the glass plate G and the stopper 15 is increased. No sliding will occur. Therefore, the problem that the glass plate G is scratched is avoided, and the problem that proper and free bending of the glass plate G is obstructed is also avoided.

Further, according to the deflection measuring apparatus 1 according to the present embodiment, the amount of deflection and the difference in deflection are measured using the image pickup means 20, the height gauge 21 (image pickup lifting means and height measuring means), and the display means 24. Therefore, it is not necessary to use a laser range finder that requires careful handling. In this case, the laser range finder or the like is installed in the lower region or the upper region of the glass plate G placed on the two main support members 2. When a laser rangefinder or the like is installed in the lower region of the glass plate G, problems such as interference with the intermediate support member 13 may occur. Further, when the laser range finder or the like is arranged in the upper region of the glass plate G, when the glass plate G is moved onto the two main support members 2, a problem such as interference with the glass plate G occurs. obtain. However, in the present embodiment, the image pickup unit 20, the image pickup lift unit 21, and the display unit 24 are arranged in a region excluding the lower region and the upper region of the glass plate G (the region behind the glass plate G). .. Therefore, problems such as interference with the intermediate support member 13 and the glass plate G do not occur, and the degree of freedom in layout of these

means

20, 22, 24 increases.

Further, according to the deflection measuring device 1 according to the present embodiment, when changing the size of the glass sheet G, the main supporting drive means 3 separates the two main supporting members 2 from each other at the center position between them. It is configured to move symmetrically on both sides. Therefore, even if the size of the glass plate G is changed, the central position of the glass plate G is kept constant in the direction parallel to the end surface Ga of the glass plate G to be measured. Accordingly, most of the work of placing the glass plate G and the work of measuring the deflection can be performed under the same conditions regardless of the size of the glass plate G.

(Modification)
In the above embodiment, the intermediate support member 13 is moved up and down along the vertical line, but instead of this, the intermediate support member 13 may be moved up and down along the inclined direction. In this case, it is preferable to move the intermediate support member 13 downward at high speed.

Further, in the above embodiment, a fluid pressure cylinder such as an air cylinder is used as the intermediate support elevating means 14 for moving the intermediate support member 13 up and down, but other means such as a ball screw mechanism is used instead. You may. The stopper driving means 17 for moving the stopper 15 in the protruding and retracting directions may be replaced with a fluid pressure cylinder such as an air cylinder, and other means such as a ball screw mechanism may be used.

Further, in the above embodiment, the CCD camera is used as the image pickup unit 20, but other cameras or image sensors may be used instead.

Further, in the above embodiment, the height gauge 21 is used as the imaging elevating means 21 for moving the imaging means 20 up and down, but instead of this, other means such as a fluid pressure cylinder such as an air cylinder or a ball screw mechanism. May be used. In this case, a scale or the like may be used as the height measuring means of the image pickup means. Alternatively, the deflection may be measured by displaying a scale line provided at a predetermined interval with respect to the reference line 25 on the display means 24. From the viewpoint of reducing the error and performing the measurement efficiently, it is preferable to use the height gauge 21 as the imaging elevating means and the measuring means.

Furthermore, in the above embodiment, various components are installed on the surface plate 6, but these components may be installed on other bases.

Further, in the above embodiment, the two main support members 2 are configured to be moved in the lateral direction, but one main support member 2 is fixedly installed, and only the other main support member 2 is moved in the lateral direction. It may be configured as follows.

Further, in the above embodiment, the main support member 2 is moved by operating the handle 9, but the main support member 2 may be moved by an electric signal or the like.

In the above embodiment, the main support member 2 is a flat plate-shaped member and the intermediate support member 13 is a member having an L-shaped cross section, but the shape of these

support members

2 and 13 is not particularly limited.

Further, in the above embodiment, one intermediate support member 13 is arranged between the two main support members 2, but two or more intermediate support members 13 may be arranged. Further, in the above embodiment, the intermediate support member 13 is arranged at the center position between the two main support members 2, but it may be arranged at a position other than the center position. From the viewpoint of eliminating warpage due to an external force, it is preferable that the adjacent support members (main support member 2 and intermediate support member 13) are arranged so that the intervals between them are equal. It is preferable to arrange them.

In addition, in the above embodiment, one main support member 2 is composed of one member, but one main support member 2 may be composed of a plurality of members. When one main support member 2 is composed of a plurality of members, one main support member 2 may be vertically expandable and contractable. Similarly, the intermediate support member 13 may be extendable/contractible in the vertical direction.

In the above embodiment, the work of setting the first zero point position is performed with the glass plate G having the end surface to be measured placed on each of the

support members

2 and 13. In this mode, when the glass plate G is thin, some bending occurs even when the glass plate G is placed on each of the

support members

2 and 13, so that it takes time to set the first zero point position. .. Therefore, instead of the glass plate G having the end surface to be measured, a glass plate thicker than the glass plate G having the end surface to be measured, a straight edge (straight ruler), or the like is placed on each of the

support members

2 and 13. In this state, the work of setting the first zero point position may be performed. In this case, after the work of setting the first zero point position is completed, the glass plate G having the end surface to be measured is placed on each of the

support members

2 and 13 to measure the amount of bending and the bending difference. Good. Thereby, even if the glass plate G is thin, the measurement work can be efficiently performed.

(Production method)
Then, the manufacturing method of the glass plate which concerns on embodiment of this invention is demonstrated. The manufacturing method of the present embodiment includes a preparation step of preparing a glass plate and a measurement step of measuring the bending of the glass plate. The preparation step is, for example, a forming step of forming a glass ribbon from the molten glass by an overflow method or a float method, a cutting step of cutting out a glass plate from the glass ribbon, and a processing step of processing the end face of the cut out glass plate with a grindstone The method includes a step of cleaning the glass plate whose end face is processed, and a sampling step of sampling a part of the glass plate. In the collecting step, for example, the glass plate that has been subjected to the cutting step may be collected, or the glass plate that has been subjected to the cleaning step may be collected. The cutting step may include a first cutting step of cutting a glass plate from the glass ribbon, and a second cutting step of cutting one or more glass plates from the glass plate that has gone through the first cutting step, in this case, In the collecting step, the glass plate that has undergone the first cutting step may be collected.

In the measuring step, the bending is measured using the above-described glass plate bending measuring device 1. The measurement step includes, for example, a sample preparation step of cutting out a glass plate of a sample of a predetermined size from the collected glass plate, a support step of supporting the glass plate of the sample with two main support members 2 and an intermediate support member 13, And a retracting step of retracting the intermediate supporting member 13 and supporting the sample glass plate only by the two main supporting members 2. The measurement step may be performed by the procedure described in the above-mentioned deflection measurement.

As described above, according to the manufacturing method according to the present embodiment, since the above-described glass plate bending measuring device 1 is used, it is possible to reduce the measurement error when measuring the bending of the sampled glass plate. Therefore, the quality of the manufactured glass plate can be improved.

1 Deflection Measuring Device 2 Main Support Member 3 Main Support Driving Means 13 Intermediate Support Member 14 Intermediate Support Lifting Means 15 Stopper 17 Stopper Driving Means 18 Scale 20 Imaging Means 21 Height Gauge (Imaging Lifting Means and Height Measuring Means)
24 Display means G Glass plate Ga End surface to be measured of glass plate

Claims

Two main supporting members for supporting the glass plate from below are provided, and configured to measure the bending of the glass plate that occurs between the two main supporting members,
An apparatus for measuring the deflection of a glass plate, characterized in that an intermediate support member is disposed between the two main support members to support the glass plate from below and to retract the glass plate from the glass plate.
An intermediate support elevating means for moving the intermediate support member up and down is provided, the intermediate support member supports the glass plate from below when the intermediate support member is in an upper position, and the intermediate support member is located above the upper position. The apparatus for measuring deflection of a glass plate according to claim 1, wherein the intermediate support member is configured to retract from the glass plate when in the lower position.
The apparatus for measuring deflection of a glass plate according to claim 2, wherein the upper end of the intermediate support member and the upper ends of the two main support members are held at the same height when the intermediate support member is at the upper end position.
Imaging means for imaging the end face of the glass plate to be measured, imaging lifting means for moving the imaging means up and down, height measuring means for measuring the height of the imaging means, and the imaging means for imaging. The glass plate deflection measuring device according to claim 2, further comprising a display unit for displaying an image.
A stopper for positioning the glass plate in a direction orthogonal to the end surface of the glass plate to be measured, and withdrawing the stopper from the glass plate in accordance with the downward movement from the upper moving end position of the intermediate support member. The glass plate deflection measuring device according to any one of claims 2 to 4, further comprising a stopper driving means.
The apparatus for measuring deflection of a glass plate according to claim 5, further comprising a scale for positioning the glass plate in a direction parallel to an end surface of the glass plate to be measured.
The deflection measurement of the glass plate according to any one of claims 1 to 6, further comprising drive means for main support that moves at least one of the two main support members so that the two main support members approach and separate from each other. apparatus.
8. The apparatus for measuring the deflection of a glass plate according to claim 7, wherein the main support drive means is configured to move the two main support members symmetrically on both sides of the center position between them. ..
A method for manufacturing a glass plate, comprising a preparatory step of preparing a glass plate, and a measuring step of measuring the bending of the glass plate,
In the measuring step, the bending is measured using the glass plate bending measuring device according to claim 1,
The measuring step includes a step of supporting the glass plate with the two main supporting members and the intermediate supporting member, a step of retracting the intermediate supporting member, and supporting the glass plate with the two main supporting members. And a method for manufacturing a glass plate.