Source: https://patents.google.com/patent/WO2009118952A1/en
Timestamp: 2020-08-08 02:35:48
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WO2009118952A1 - Glass substrate inspecting apparatus and glass substrate inspecting method - Google Patents
Glass substrate inspecting apparatus and glass substrate inspecting method Download PDF
WO2009118952A1
WO2009118952A1 PCT/JP2008/071454 JP2008071454W WO2009118952A1 WO 2009118952 A1 WO2009118952 A1 WO 2009118952A1 JP 2008071454 W JP2008071454 W JP 2008071454W WO 2009118952 A1 WO2009118952 A1 WO 2009118952A1
PCT/JP2008/071454
喜春 外間
正善 山本
忠徳 安井
2008-03-27 Priority to JP2008-084794 priority Critical
2008-03-27 Priority to JP2008084794A priority patent/JP5403389B2/en
2008-11-26 Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
2009-10-01 Publication of WO2009118952A1 publication Critical patent/WO2009118952A1/en
239000011521 glass Substances 0.000 title claims abstract description 158
239000000758 substrates Substances 0.000 title claims abstract description 155
238000007689 inspection Methods 0.000 claims abstract description 25
238000007500 overflow downdraw method Methods 0.000 description 2
Defect inspection accuracy is improved by correcting warping of a glass substrate without generating excessive stress concentration on a side of the glass substrate, while meeting a demand of inspecting defects with a simple apparatus constitution while the glass substrate is being shifted. A glass substrate inspecting apparatus (1) inspects existence of defects included in a glass substrate (G) by scanning the glass substrate (G) by using a defect detecting means (3) by relatively moving the glass substrate (G) in the vertical posture to the defect detecting means (3) in the width direction of the glass substrate (G). The glass substrate inspecting apparatus is provided with an upper holding means (4) which holds the upper side of the glass substrate (G), and a lower holding means (5) which holds the lower side of the glass substrate (G). The glass substrate (G) is held only by the upper holding means (4) and the lower holding means (5), and the upper holding means (4) and the lower holding means (5) are separated one from the other. The glass substrate (G) is shifted in the width direction toward the defect detecting means (3), in a state where tension is applied to the glass substrate (G) in the vertical direction.
Glass substrate inspection apparatus and glass substrate inspection method
The present invention relates to a glass substrate inspection apparatus and a glass substrate inspection method for inspecting the presence or absence of defects contained in a glass substrate.
As is well known, various glass plates such as glass substrates for flat panel displays (FPD) such as liquid crystal displays, plasma displays, electroluminescence displays, field emission displays, etc. are made of a molten glass melted in a melting furnace. In many cases, it is manufactured by forming into a glass ribbon, and sufficiently cooling the glass ribbon and then cutting it into a predetermined dimension. Here, for the forming of the glass ribbon, in addition to the float method, a down draw method such as an overflow down draw method (fusion method) or a slot down draw method is generally used.
And the glass substrate manufactured through such a process (including a mother glass substrate on which a small glass substrate is multi-faced) is sent to an inspection process, and it is inspected for the presence of defects such as micro-scratches and foreign matter. It is customary.
As an apparatus used in this type of inspection process, for example, as disclosed in Patent Document 1 below, a glass substrate is placed horizontally on a conveyance roller, and the glass substrate is held in a horizontal posture by the conveyance roller. A device that is configured to detect a defect of a glass substrate by a light source and a camera such as a CCD sensor while being moved is known.
However, in the case of such a configuration, when a recent large and thin glass substrate is an inspection target, a situation may occur in which the glass substrate is largely bent downward by its own weight between the transport rollers. Since it is customary to use a camera for inspecting a glass substrate, if the glass substrate bends in this way, there is a problem that the focal point of the camera shifts and defects cannot be detected accurately. obtain. In particular, in the case of a glass substrate for FPD, in order to ensure high quality, it is necessary to detect, for example, very small scratches of about several tens of μm as defects. Loss of accuracy becomes a bigger problem.
Therefore, in Patent Document 2 below, all the four sides of the glass substrate in a vertical posture are gripped by the clamping means, and the glass substrate is pulled by each clamping means so that the glass substrate is extended in the vertical direction and the horizontal direction. An apparatus is disclosed that is fixed at a fixed position and inspects the glass substrate for defects by integrally moving an illumination device and a camera with respect to the fixed glass substrate.
JP 2006-266933 A JP 2005-172882 A
By the way, since the four sides, which are the end portions of the glass substrate, are easily damaged, it is important to suppress the number of sides to be gripped as much as possible. However, in the technique disclosed in Patent Document 2 above, all four sides of the glass substrate are held by the clamping means. In addition, the glass substrate is pulled not only in the vertical direction but also in the horizontal direction in a state where all four sides are gripped. There is a possibility that the substrate may be damaged starting from the end portion.
Further, as described in the above-mentioned Patent Document 1, in the inspection of a glass substrate, it is often the case that it is requested to inspect the defect while moving the glass substrate. However, in the method disclosed in Patent Document 2, the glass substrate is fixed at a fixed position, and only the lighting device and the camera are moved. Moreover, if it is attempted to move the glass substrate in the width direction while holding all four sides of the glass substrate in order to meet such a request, the clamping means is also located in the moving direction. Since the apparatus for realizing the movement becomes complicated and large, it is not practical.
In view of the above circumstances, the present invention responds to a request for inspecting a defect while moving a glass substrate with a simple apparatus configuration, and without causing excessive stress concentration on the side of the glass substrate, The technical problem is to improve the detection accuracy of defects by correcting the defects.
The apparatus according to the present invention, which was created to solve the above-mentioned problems, scans the defect detection means relative to the glass substrate by moving the glass substrate in a vertical posture relative to the defect detection means, and In the glass substrate inspection apparatus for inspecting the presence or absence of defects contained in the glass substrate, the glass substrate inspection apparatus includes upper gripping means for gripping the upper side of the glass substrate, and lower gripping means for gripping the lower side of the glass substrate, While holding the glass substrate only by the gripping by the lower gripping means, the upper gripping means and the lower gripping means are separated from each other, and the glass substrate is tensioned in the vertical direction. Is characterized in that it is configured to move in the width direction toward the defect detection means.
According to such a configuration, only the upper side and the lower side of the four sides of the glass substrate are gripped by the upper gripping means and the lower gripping means. Therefore, even if the upper gripping means and the lower gripping means are separated from each other in this state and tension is applied to the glass substrate in the vertical direction, excessive stress concentration does not occur on both sides in the width direction of the glass substrate. Furthermore, since there is no gripping means in the width direction that is the movement direction of the glass substrate, the movement of the glass substrate can be realized with a simple apparatus configuration.
In the above configuration, it is preferable that only the glass substrate is moved among the glass substrate and the defect detection means.
In this case, since it is not necessary to move the defect detection means having a heavy camera or the like, the frequency of maintenance is reduced as compared with the case where the defect detection means is moved. Therefore, the defect detection means can be used in a stable state for a long period of time, which is very advantageous economically.
The method according to the present invention, which was created to solve the above-mentioned problems, is a method in which the glass substrate in a vertical posture is moved relative to the defect detection means in the width direction, thereby causing the defect to the glass substrate. In a glass substrate inspection method that scans a detection means and inspects for the presence or absence of defects contained in the glass substrate, the glass substrate is held in a state in which only the upper and lower sides of the glass substrate are gripped and tension is applied in the vertical direction. It is characterized by moving in the width direction toward the defect detection means.
According to such a method, the operational effects already described in paragraph [0011] can be similarly enjoyed.
In the above method, it is preferable that the defect detection means is fixed at a fixed position and only the glass substrate is moved.
In this way, the effects already described in paragraph [0013] can be enjoyed in the same way.
As described above, according to the present invention, the deflection of the glass substrate is corrected without causing excessive stress concentration on the side of the glass substrate while accurately responding to a request for inspecting defects while moving the glass substrate. Thus, the defect detection accuracy can be improved.
It is a perspective view showing a glass substrate inspection device concerning one embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Glass substrate inspection apparatus 2 Moving means 3 Defect detection means 4 Upper holding means 4a Holding part 4b Base part 5 Lower holding means 5a Holding part 5b Air cylinder 5c Base part 6 Upper guide rail 7 Lower guide rail 8 Light source 9 Line sensor 9a Camera
FIG. 1 is a side view showing the overall configuration of the glass substrate inspection apparatus according to the present embodiment. As shown in the figure, the glass substrate inspection apparatus 1 includes a moving unit 2 that moves the glass substrate G in a vertical posture (substantially vertical posture in the figure), and a glass substrate G that is moved by the moving unit 2. Defect detection means 3 that is arranged on the movement path and detects a defect of the glass substrate G. Examples of the glass substrate G include a glass substrate for liquid crystal display having a thickness of 0.05 to 1.8 mm and a side dimension of 1 m or more.
The moving means 2 includes an upper holding means 4 for holding the upper side of the glass substrate G, a lower holding means 5 for holding the lower side of the glass substrate G, and the upper holding means 4 in the width direction of the glass substrate G (in the drawing). An upper guide rail 6 that guides in the direction of the arrow A) and a lower guide rail 7 that guides the lower gripping means 5 in the width direction of the glass substrate G (the direction of arrow A in the figure).
The upper guide rail 6 is disposed at an upper position on the upper side of the glass substrate G, and the lower guide rail 7 is disposed at a lower position on the lower side of the glass substrate G. Both guide rails 6 and 7 have a width of the glass substrate G. Extends parallel to the direction.
The upper grip means 4 includes a center portion of the upper side of the glass substrate G, three grip portions 4a for gripping both sides thereof, and a base portion 4b to which the three grip portions 4a are attached. The base portion 4b Is slidably attached to the upper guide rail 6. Note that the number of the gripping portions 4a of the upper gripping means 4 is not particularly limited, and may be appropriately adjusted according to the size and thickness of the glass substrate G, or the entire upper side of the glass substrate G may be gripped by one. You may make it hold | grip with the part 4a.
The lower gripping means 5 is provided with three gripping portions 5a for gripping the central portion of the lower side of the glass substrate G and both sides thereof, and these three gripping portions 5a are attached and extendable in the vertical direction (the direction of arrow B in the figure). The air cylinder 5b is provided with a base portion 5c to which the air cylinder 5b is attached. The base portion 5c is slidably attached along the lower guide rail 7. Note that the number of the gripping portions 5a of the lower gripping means 5 is not particularly limited, and may be appropriately adjusted according to the size and thickness of the glass substrate G, or the entire lower side of the glass substrate G may be gripped by one. You may make it hold | grip with the part 5a.
The defect detection means 3 includes a light source 8 that emits line light that is long in the vertical direction, and a line sensor 9 in which a plurality of cameras 9 a are arranged in the vertical direction, and irradiates the glass substrate G from the light source 8. The received light is received by the line sensor 9 on the opposite side of the glass substrate G, and the presence or absence of a defect is detected based on the change in the received light quantity.
Furthermore, in this embodiment, the defect detection means 3 is fixed at a fixed position on the movement path of the glass substrate G, and the glass substrate G is directed toward the defect detection means 3 by the upper grip means 4 and the lower grip means 5. By moving in the width direction, the camera 9a of the defect detection means 3 is scanned over the entire glass substrate G.
Next, the operation of the glass substrate inspection apparatus 1 configured as described above will be described.
First, the upper side of the glass substrate G sequentially conveyed from the upstream side of the glass substrate inspection apparatus 1 is gripped by the grip portion 4a of the upper grip means 4, and the glass substrate G is suspended and supported. Next, the lower gripping means 5 is raised toward the lower side of the glass substrate G by the air cylinder 5b, and the lower side of the glass substrate G is gripped by the gripping part 5a of the lower gripping means 5. Then, from this state, the lower gripping means 5 is lowered again by the air cylinder 5b, and the lower side of the glass substrate G is pulled downward by the gripping portion 5a attached to the air cylinder 5b. That is, since the grip portion 5a of the lower grip means 5 is separated downward with respect to the grip portion 4a of the upper grip means 4, tension is applied to the glass substrate G in the vertical direction. Therefore, the bending of the glass substrate G can be corrected by the tension applied in the vertical direction. Further, at this time, since both sides in the width direction of the glass substrate G are in a free state without being supported from the outside, it is difficult to cause a situation where stress concentration occurs on both sides due to the tension applied in the vertical direction. .
The base rail 4b of the upper gripping means 4 and the base portion 5c of the lower gripping means 5 are synchronized with each other while the upper and lower sides of the glass substrate G are gripped and tension is applied in the vertical direction. 6 and 7, the glass substrate G is passed between the light source 8 and the line sensor 9 of the defect detection means 3.
At this time, the glass substrate G passed between the light source 8 and the line sensor 9 of the defect detection means 3 is in a state in which tension is applied in the vertical direction by the upper gripping means 4 and the lower gripping means 5. Therefore, the bending of the glass substrate G is corrected. Therefore, it is possible to reliably reduce a situation in which the focus position of the camera 9a of the line sensor 9 is shifted due to the bending of the glass substrate G and the defect detection accuracy is lowered. Furthermore, since there is no gripping means in the width direction that is the moving direction of the glass substrate G, the glass substrate G can be moved with a simple apparatus configuration.
Note that, when the entire glass substrate G has passed between the light source 8 and the line sensor 9 of the defect detection means 3, the upper side of the glass substrate G is gripped by another gripping means (not shown). In this state, the upper gripping means 4 and the lower gripping means 5 are moved away from the upper and lower sides of the glass substrate G, moved upstream along the guide rails 6 and 7, and returned to their original positions. On the other hand, the glass substrate G that has been inspected is transferred to a subsequent processing step when a defect is not detected, and is discarded as a defective product when a defect is detected, or is normal without defects. A new glass substrate G is taken from the portion.
According to the glass substrate inspection apparatus 1 according to the present embodiment as described above, it is possible to cope with a request for inspecting a defect while moving the glass substrate G with a simple apparatus configuration. Without causing excessive stress concentration on the sides, it is possible to accurately correct the deflection of the glass substrate G and improve the detection accuracy of defects.
In addition, this invention is not limited to said embodiment, It can implement with a various form. For example, in the above embodiment, the case where the tension of the glass substrate G is applied by being pulled by the air cylinder 5b has been described. However, the tension is applied to the glass substrate G by the weight of the grip portion 5a of the lower grip means 5. Also good. Further, in this case, when the weight of the grip portion 5a of the lower grip means 5 is too heavy, the air cylinder 5b lifts the grip portion 5a upward, and when the weight of the grip portion 5a is too light, the air cylinder 5b moves the grip portion 5a downward. It is preferable to adjust the tension acting on the glass substrate G by pulling it down.
The glass substrate in a vertical posture is moved relative to the defect detection means in the width direction of the glass substrate, thereby scanning the glass substrate for the defect detection means to inspect for defects contained in the glass substrate. In the glass substrate inspection device to
Upper gripping means for gripping the upper side of the glass substrate, and lower gripping means for gripping the lower side of the glass substrate,
A state in which the glass substrate is held only by gripping by the upper gripping means and the lower gripping means, and the upper gripping means and the lower gripping means are separated from each other, and tension is applied to the glass substrate in the vertical direction. The glass substrate inspection apparatus is configured such that the glass substrate moves in the width direction toward the defect detection means.
The glass substrate inspection apparatus according to claim 1, wherein only the glass substrate of the glass substrate and the defect detection means is moved.
The glass substrate in a vertical posture is moved relative to the defect detection means in the width direction of the glass substrate, thereby scanning the glass substrate for the defect detection means to inspect for defects contained in the glass substrate. In the glass substrate inspection method to
A glass substrate inspection method, wherein the glass substrate is moved in the width direction toward the defect detection means in a state in which only the upper and lower sides of the glass substrate are gripped and tension is applied in the vertical direction.
4. The glass substrate inspection method according to claim 3, wherein only the glass substrate of the glass substrate and the defect detection means moves.
PCT/JP2008/071454 2008-03-27 2008-11-26 Glass substrate inspecting apparatus and glass substrate inspecting method WO2009118952A1 (en)
JP2008-084794 2008-03-27
JP2008084794A JP5403389B2 (en) 2008-03-27 2008-03-27 Glass substrate inspection apparatus and glass substrate inspection method
CN200880119235.5A CN101889199B (en) 2008-03-27 2008-11-26 Glass substrate inspecting apparatus and glass substrate inspecting method
WO2009118952A1 true WO2009118952A1 (en) 2009-10-01
ID=41113174
PCT/JP2008/071454 WO2009118952A1 (en) 2008-03-27 2008-11-26 Glass substrate inspecting apparatus and glass substrate inspecting method
JP (1) JP5403389B2 (en)
KR (1) KR101471899B1 (en)
CN (1) CN101889199B (en)
TW (1) TWI447381B (en)
WO (1) WO2009118952A1 (en)
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2008-11-26 CN CN200880119235.5A patent/CN101889199B/en active IP Right Grant
2008-11-26 KR KR1020107011729A patent/KR101471899B1/en active IP Right Grant
2008-11-26 WO PCT/JP2008/071454 patent/WO2009118952A1/en active Application Filing
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