KR20100070966A - Apparatus for detecting defect on the edge of glass panel in the moving direction - Google Patents

Abstract

The present invention relates to a defect detection device of the edge surface of the glass substrate in the traveling direction, and more specifically, to obtain the edge image of the top and bottom of the glass substrate perpendicular to the conveying direction of the glass substrate, Arrange a plurality of area cameras in a vertical line with respect to the conveying direction, and the sensor detects the entrance of the upper edge of the glass substrate or the entry of the lower edge of the glass substrate, and the upper edge of the upper surface and the lower edge of the glass substrate at an accurate pre-programmed timing. An apparatus for detecting a defect of an edge surface of a glass substrate in a direction in which a glass substrate is acquired to detect a defect of an edge surface of a glass substrate during transfer.

Description

Apparatus for Detecting Defect on the Edge of Glass Panel in the Moving Direction}

The present invention relates to a defect detection device of the edge surface of the glass substrate in the traveling direction, and more specifically, to obtain the edge image of the top and bottom of the glass substrate perpendicular to the conveying direction of the glass substrate, Arrange a plurality of area cameras in a vertical line with respect to the conveying direction, and the sensor detects the entrance of the upper edge of the glass substrate or the entry of the lower edge of the glass substrate, and the upper edge of the upper surface and the lower edge of the glass substrate at an accurate pre-programmed timing. An apparatus for detecting a defect of an edge surface of a glass substrate in a direction in which a glass substrate is acquired to detect a defect of an edge surface of a glass substrate during transfer.

Glass substrates are used in display products that display certain moving image screens, and the representative ones are CRT (Cathode Ray Tube), PDP (Plasma Display Panel), LCD (Liquid Crystal Display), and OLED (Organic Light Emitting Diode).

CRT (Cathode Ray Tube) is a cathode ray tube, also known as a brown tube, is an apparatus that displays an image by converting an electrical signal into an optical image by emitting an electron beam to a fluorescent surface. CRT is one of the most widely used in conventional televisions and monitors. It is cheaper than projection, LCD, and PDP, so it is economically less expensive, and it has better image quality than projection, PDP, and LCD. However, for example, it is difficult to enjoy large screens because it is not easy to produce more than 34 inches.

Plasma Display Panel (PDP) utilizes the phenomenon of plasma, which is a mixture of ions and electrons. PDP is very thin, so it is also suitable for wall-mounting. It has the advantage that almost no afterimage remains even in the video system, and the color is excellent. However, there is a drawback that not only generates a lot of heat but also consumes relatively high power compared to other things.

LCD (Liquid Crystal Display) is a liquid crystal (Liquid Crystal) between the two glass substrates. LCD is more advantageous than PDP in resolution because it is produced by semiconductor process. LCD has a disadvantage of slow response time, but these disadvantages have been improved a lot recently.

Organic Light Emitting Diodes (OLEDs) are considered to be next-generation displays that will replace the aforementioned LCDs. The high energy efficiency and bright brightness make it suitable for the display of small home appliances. OLED, also called organic EL, is made by emitting light by applying electric field with its own light emitting method. It boasts vivid color, light structure and fast response speed.

The size of the screen employed as a conventional display device is mostly from about 14 to about 30 screens. In recent years, however, they prefer large screens of 40 or more for wider viewing. Therefore, the size of the glass substrate used is gradually increasing in size.

The glass substrate goes through a molding process of forming a glass substrate through raw materials, and is then released as a product in a state that satisfies basic specifications through a cutting process of cutting to a corresponding standard and a polishing process of polishing a corresponding part. Of course, in addition to the cutting and polishing process, it also involves an inspection process or a repair process if necessary.

A variety of factors can cause defects in glass substrates, starting with shaping glass substrates and getting to the final product.

Among defects that may occur in the glass substrate, a defect occurs at an edge, which is an end surface of the glass substrate, is called an edge defect of the glass substrate.

The edge defect of the glass substrate means that the edges of the glass substrate are not parallel and have cracks or bumps due to impacts. Depending on the extent of the edge defect, the glass substrate may be repaired through a repair process. However, if the level of defects on the edge is severe, the glass substrate may be discarded.

In order to inspect the edge of the glass substrate without stopping the glass substrate being transported at high speed in the in-line automated production line, the edges are analyzed by analyzing the image data obtained by installing line scan cameras at both ends of the glass substrate. The method of judging the defect of the cotton was common. However, this conventional method has a disadvantage in that the defects of the edges of the top and bottom of the glass substrate based on the transport direction of the glass substrate cannot be grasped.

The present invention has been made to solve the above problems, the process of the glass substrate in the in-line automated production line for the inspection of the edge of the upper and lower surfaces of the glass substrate perpendicular to the conveying direction of the glass substrate An object of the present invention is to provide a flaw detection device for the edge surface of the glass substrate in a direction in which the glass substrate can be inspected for defects in the upper and lower edges of the glass substrate while the glass substrate is not stopped.

In order to achieve the above object, the defect detection apparatus of the edge surface of the advancing direction of the glass substrate according to the present invention, the transfer device 30 for transferring the large glass substrate 10 for defect detection of the edge surface; A plurality of area cameras 50 and 52 for photographing an edge surface of the glass substrate 10 in the direction of travel direction; A camera support frame 55 for supporting the area cameras 50 and 52 in a row; A main frame 60 supporting the camera support frame 55 and capable of lifting up and down by a driving device such as a motor;

First and second distances provided on the bottom surface of the glass substrate 10 transferred by the transfer device 30 and on the side indicated by camera lenses immediately below the area cameras 50 and 52; Second lighting devices 20 and 22;

First and second detection sensors 40 and 42 for detecting entry and exit of the glass substrate 10; A control device (100) including a circuit for sensing a signal according to the entry and exit of the glass substrate (10) and adjusting a time taken by the area camera (50, 52) according to the detected signal; And

And a reading computer 120 for reading out defects of the edges in the traveling direction of the glass substrate 10 photographed by the area cameras 50 and 52,

The first and second lighting devices (20, 22) is characterized in that the backlight is composed of a light emitting diode and a diffusion plate,

The first and second lighting devices (20, 22) is characterized in that are installed spaced apart from each other by a predetermined distance with respect to the traveling direction of the glass substrate 10,

The length of each of the first and second lighting devices 20, 22 is longer than 1/2 of the total length of the upper and lower glass substrates 10 perpendicular to the direction in which the glass substrates 10 are conveyed. Characterized in that,

The images of the top and bottom of the glass substrate photographed from the plurality of area cameras (50, 52) is output and processed in one of the reading computer,

A plurality of area cameras 50 and 52 are respectively installed on tops of positions corresponding to positions where the first and second lighting devices 20 and 22 are installed.

In the defect detection device of the edge surface of the glass substrate in the traveling direction according to the present invention, it is possible to inspect the defects of the upper and lower edges of the glass substrate perpendicular to the feeding direction of the glass substrate without stopping the transfer of the glass substrate. Therefore, it is possible to improve productivity by reducing loss caused by inspection time and inspection method.

Preferred embodiments, advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

1 and 2 are perspective views of a defect detection apparatus of the edge surface of the glass substrate according to the present invention in the traveling direction.

1 and 2, the defect detecting apparatus of the edge surface of the glass substrate according to the present invention according to the present invention transfers a large glass substrate 10 to the defect detection of the edge of the glass substrate. Camera support frame 55, camera for supporting a plurality of first and second area cameras 50 and 52, area cameras 50 and 52 in a line, photographing the edge surface of the direction of the substrate 10 in advance. On the underside of the main frame 60 which can support the support frame 55, and can move up and down by the drive apparatus, such as a motor, and the glass substrate 10 conveyed by the conveying apparatus 30, the 1st And the first and second lighting devices 20 and 22 and the glass substrate 10, which are installed at a lower portion of the second area cameras 50 and 52, that is, on the side indicated by the camera lenses, at a distance from each other. First and second detection sensors 40 and 42 for detecting entry and exit, glass substrate Control device 100, area camera including a circuit or a computer program for detecting a signal according to the entry and exit of the (10), and adjusts the time taken by the area cameras (50, 52) in accordance with the detected signal ( And a reading computer 120 equipped with a circuit or a program for reading out defects in the edges in the direction of the direction of travel of the glass substrate 10 photographed by 50 and 52.

The glass substrate 10 to be detected in the defect detection device on the edge side of the glass substrate according to the present invention corresponds to a large glass substrate having a relatively large size. In the embodiment according to the present invention, the glass substrate 10 whose width A in the advancing direction side of the glass substrate 10 is 2.2 m or more corresponds to the defect inspection object on the edge surface. However, the length of the width A of the traveling direction side of the glass substrate 10 is not limited to 2.2 m and can be freely modified.

The first and second lighting apparatuses 20 and 22 according to the present invention are installed at the lower part of the glass substrate 10 to be transported, and the front and rear portions of the glass substrate 10 by the area cameras 50 and 52 (glass It serves to irradiate light when the edge surface of the substrate 10 is perpendicular to the advancing direction of the substrate 10. The lighting apparatus 20, 22 according to the present invention preferably comprises a light emitting diode (LED) and a diffusion plate, wherein the light of the light emitting diode is configured to be backlit illumination irradiated using the diffusion plate.

Since the glass substrate 10 to be detected by the defect detection apparatus of the edge surface according to the present invention is a glass substrate 10 having a width A of 2.2 m or more in the traveling direction, the total length of the lighting devices 20 and 22 is increased. It should be longer than the width A of the advancing side of the glass substrate 10. Lighting devices 20 and 22 having such lengths require that the overall length of the diffuser plate also has a length of at least 2. 2 m. However, currently, it is difficult to supply a diffuser plate having a total length of 2.2 m or more from a producer producing a diffuser plate, and a manufacturing cost increases to receive a diffuser plate having a total length of 2.2 m or more.

In addition, in the case of constructing a lighting device having a length of 2.2m or more by installing two diffusion plates, there may be a problem that the illumination of the boundary portion where two diffusion plates overlap is uneven. Such a problem may be a problem that impairs the accuracy of the inspection of the etched surface of the glass substrate 10.

In order to solve this problem, in the present invention, the lighting apparatuses 20 and 22 are configured to install the first and second lighting apparatuses 20 and 22 at a predetermined distance from each other. Each illumination device 20, 22 is configured to include a plurality of light emitting diodes and one diffuser plate, each length B1, B2 of the first and second illumination devices 20, 22 being a glass substrate 10. It is configured to form longer than half of the length of the width (A) of the edge surface perpendicular to the conveying direction of.

In the embodiment of the present invention, since the length A of the width direction A of the glass substrate 10 is 2.2 m, the lengths B1 and B2 of the first and second lighting devices 20 and 22 are 1.2 m each. It is desirable to.

1 and 2, the ground surface on the right side of the glass substrate 10, which is conveyed in the direction of the arrow by the conveying device 30 of the glass substrate 10, is formed by the second detection sensor 42. The entrance of the glass substrate 10 is detected, the detected signal is transmitted to the control device 100, and the control device 100 delays the signal detected by the second detection sensor 42 and converts it into a camera trigger signal. Operate the camera.

The control device 100 according to the present invention transmits a camera operation trigger signal to the second area cameras 52 installed in the camera support frame 55 on the upper side facing the second lighting device 22 to the second lighting device. The floor 22 on the right side corresponding to 1/2 of the upper end of the glass substrate 10 by the area cameras 52 installed on the camera support frame 55 on the upper side facing the second lighting device 22. Take a picture and inspect the edges for defects.

Then, the surface of the left side of the glass substrate 10, which is conveyed in the direction of the arrow by the conveying device 30 of the glass substrate 10, enters the glass substrate 10 by the first sensor 40. The first area cameras 50 are detected and installed on the first lighting device 20 and the first area cameras 50 installed on the upper camera support frame 55 facing the first lighting device 20. The ground on the left side, corresponding to 1/2, is examined.

The inspection of the etched surface of the lower end of the glass substrate 10 in the advancing direction is performed after the inspection of the etched surface of the upper end of the glass substrate 10 while the glass substrate 10 is conveyed in the direction of the arrow along the feeder 30. 2 When the detection sensor 42 detects the absence of the glass substrate 10, the second area camera 52 installed at a position facing the second lighting device 22 and the second lighting device 22 after a predetermined time has passed. Is photographed on the right half of the lower end of the glass substrate 10 to examine the defect of the etch.

Then, after the glass substrate 10 advances further along the transfer device 20 and the first sensor 40 detects the absence of the glass substrate 10, the first lighting device 20 after a predetermined time has passed. And the first area camera 50 installed at the position facing the first lighting device 20 photographs the left half etched area of the bottom of the glass substrate 10 to be perpendicular to the traveling direction. Inspect the defect of the etched surface of the lower left part of the machine.

The first and second detection sensors 40, 42 according to the present invention are preferably photoelectric sensors that detect objects with low reflectivity (high transparency), such as the glass substrate 10.

The area cameras 50 and 52 according to the present invention are supported to be movable on the camera support frame 55, and the camera support frame 55 is movable up and down along the main frame 60. For optimal shooting of the edges of the upper and lower surfaces of the glass substrate 10, the position of each camera is used to change the position of each of the area cameras 50 and 52 and the main frame 60 on the camera support frame 55. The camera support frame 55 can be moved and adjusted accordingly.

Each of the area cameras 50 and 52 according to the present invention is connected to the LAN so that the captured image signal is simultaneously transmitted to the reading computer 120.

3 and 4 are operation diagrams illustrating the configuration and detection operation of the edge defect detecting apparatus according to the present invention shown in FIGS. 1 and 2.

3 and 4, the edge defect inspection of the glass substrate 10 according to the present invention is performed by a program installed in the reading computer 120, and the edge defect inspection program is largely an area camera 50. Photographing the glass substrate 10 by 52; Converting the photographed image into a digital code; Mathematically comparing the digital code with normal data; And warning if the mathematical comparison operation exceeds a user specified tolerance.

The images captured by the area cameras 50 and 52 according to the present invention are converted into digital codes in real time by the reading computer 120 to damage the edges of the top and bottom of the glass substrate 10. It is possible to determine whether or not.

Taking the glass substrate 10 and converting the input image into a number such as a digital code, and performing a mathematical comparison operation with the data of the normal glass substrate 10 input in advance in real time, by checking the difference appearing at this time If the difference occurs beyond the specified specific allowable range, it may be determined that there is a problem with the edge of the glass substrate 10, and the worker can be warned.

The normal data is a digital code of an image taken by the area cameras 50 and 52 according to the present invention while the glass substrate 10 having no defects on the edges of the glass substrate 10 passes through the edge inspection device according to the present invention. The conversion value.

In the reading computer 120 according to the present invention, the operator can visually view an image of the edge surface photographed by the area cameras 50 and 52.

The control device 100 according to the present invention detects the entrance of the upper portion of the glass substrate 10 and the exit of the lower portion of the glass substrate 10 detected by the first and second detection sensors 40 and 42. 50, 52 and the operation of the first and second lighting devices 20, 22, and the reading computer 120 according to the present invention converts the image taken by the area camera 50 into a digital code or The overall operation of the inspection for the presence of edge defects, such as performing mathematical operations and the like, is controlled.

Defects of the upper and lower edges of the glass substrate 10 according to the present invention are detected in the following order.

First, the glass substrate 10 is placed on the conveying apparatus 30 and conveyed for inspection of the edge surface. The inflow of the upper portion of the glass substrate 10 is detected by the second detection sensor 42 installed where the glass substrate 10 is introduced, and the detected signal is transmitted to the controller 100, and the controller 100 is The second area 22 and the second area cameras 52 of the upper end of the second lighting device 22 are operated, and the edge surface of the right half area of the upper portion of the glass substrate 10 is photographed to the reading computer. Transmitted, converted to a digital code in the computer 120 for reading, and through the mathematical operation to check the presence of the edge of the edge of the right half of the upper portion of the glass substrate 10 photographed.

Subsequently, in the same manner, the presence of a defect in the edge of the upper left half of the upper portion of the glass substrate 10 is detected by the first sensor 40 to enter the glass substrate, and the detected signal is transmitted to the controller 100. The controller 100 operates the first area cameras 50 at the upper end of the first lighting device 20 and the first lighting device 20, and the edge of the left half area of the upper surface of the glass substrate 10. The surface is photographed and transmitted to the reading computer 120, and the reading computer 120 is converted into a digital code, and the edge of the edge of the left half of the upper half of the photographed glass substrate 10 is determined by mathematical operation. Check it.

The operation timings of the area cameras 50 and 52 and the lighting devices 20 and 22 according to the present invention are based on the time detected by the sensor 100 and the glass substrate 10 by the control device 100. It is programmed to trigger with reference to the feed rate.

Then, the glass substrate 10 continues to be transferred, and at the moment when the absence of the glass substrate 10 is detected by the second detection sensor 42, the detected signal is transmitted to the controller 100, and the controller ( 100 operates the second area camera 52 of the upper end of the second lighting device 22 and the second lighting device 22 to photograph the edge surface of the right half region of the lower half of the glass substrate 10, and The captured image is transmitted to the reading computer 120 to be converted into a digital code, and the presence or absence of edge defects in the right half of the lower portion of the glass substrate 10 photographed through a mathematical operation is checked.

Subsequently, in the same manner, the presence or absence of an edge defect in the left half region of the lower half of the glass substrate 10 is detected by the first sensor 40, and the absence of the glass substrate 10 is detected. The control apparatus 100 operates the first area cameras 50 of the upper part of the first lighting device 20 and the first lighting device 20, and the left half area of the lower left side of the glass substrate 10. The edge of the film, and the captured image is sent to the reading computer 120 to be converted into a digital code, and through the mathematical operation to check for edge defects in the left half of the lower half of the photographed glass substrate 10. do.

As shown in FIG. 4, once the first and second detection sensors 40 and 42 detect the existence of the glass substrate 10, the glass substrate 10 is the first and second detection sensors 40 and 42. The controller 100 no longer sends a trigger signal for the area cameras 50 and 52 to operate while being transported upward.

Figure 5 is a front view of the state in which the edge surface of the advance direction of the glass substrate according to the present invention is subjected to defect inspection by 1/2.

Referring to Fig. 5, it is preferable that the ranges photographed by the area cameras 50 overlap so that overlapping regions C are generated.

6 is a plan view from above of a state in which the edge surface of the glass substrate according to the present invention is subjected to defect inspection by 1/2.

Referring to FIG. 6, the first and second lighting devices 20 and 22, which are spaced apart from the front and rear, are installed to be positioned at the bottom of the glass substrate 10 to be transported, and are vertically spaced up and down with the area cameras 50 and 52. It will be installed in the opposite position.

In addition, the first and second lighting devices 20 and 22 which are spaced apart from the front and rear are overlapped areas D in which portions irradiated to the glass substrate 10 by the respective lighting devices 20 and 22 overlap. Installed so that the edges of the top and bottom of the glass substrate 10 are inspected as a whole.

The defect detection apparatus of the edge surface of the glass substrate in the traveling direction according to the present invention includes two lighting apparatuses configured to be longer than 1/2 of the total length of the upper and lower edges of the glass substrate to be inspected. By installing a plurality of area cameras in the upper part corresponding to each lighting device, the remarkable effect of detecting the combination of the upper and lower edges of the entry direction by the conveying device of a large glass substrate larger than 2 m in width can be detected. have.

Instead of installing the lighting device having the same length as the surface perpendicular to the conveying direction of the large glass substrate to be inspected, the lighting device is divided into two and the total length of the surface perpendicular to the conveying direction of the glass substrate. It is effective to construct a lighting device capable of backlighting including a light emitting diode and a diffusion plate at a lower cost by configuring only a little longer than 1/2.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

1 and 2 are perspective views of a defect detection apparatus of the edge surface of the glass substrate according to the present invention in the traveling direction.

3 and 4 are operation diagrams illustrating the configuration and detection operation of the edge defect detecting apparatus according to the present invention shown in FIGS. 1 and 2.

Figure 5 is a front view of the state in which the edge surface of the advance direction of the glass substrate according to the present invention is subjected to defect inspection by 1/2.

6 is a plan view from above of a state in which the edge surface of the glass substrate according to the present invention is subjected to defect inspection by 1/2.

DESCRIPTION OF REFERENCE NUMERALS

10: glass substrate 20, 22: lighting device

30: transfer unit 40, 42: sensor

50, 52: area camera 55: camera support frame

60: mainframe 100: controller

120: reading computer

Claims (6)

A plurality of area cameras 50 for photographing an edge surface of the glass substrate 10 in a traveling direction; A camera support frame 55 for supporting the area cameras 50 and 52 in a row; A main frame 60 supporting the camera support frame 55 and capable of lifting up and down by a driving device such as a motor; First and second lighting devices 20 and 22 provided at a distance from the bottom surface of the glass substrate 10 to be transferred and on the side indicated by the camera lenses immediately below the area cameras 50 and 52. ); First and second detection sensors 40 and 42 for detecting entry and exit of the glass substrate 10; A control device (100) including a circuit for sensing a signal according to the entry and exit of the glass substrate (10) and adjusting a time taken by the area camera (50, 52) according to the detected signal; And And a reading computer (120) which reads out defects in the edge in the direction of travel of the glass substrate (10) photographed by the area camera (50). . The method of claim 1, And said first and second lighting devices (20, 22) are backlights composed of a light emitting diode and a diffuser plate. The method of claim 1, And the first and second lighting devices (20, 22) are spaced apart from each other with respect to the traveling direction of the glass substrate (10). The method of claim 3, wherein The length of each of the first and second lighting devices 20, 22 is longer than 1/2 of the total length of the upper and lower glass substrates 10 perpendicular to the direction in which the glass substrates 10 are conveyed. The defect detection apparatus of the edge surface of the advancing direction side of a glass substrate. The method of claim 1, Detecting defects on the edge surface of the glass substrate in the direction of progress of the glass substrate, characterized in that the image of the top and bottom of the glass substrate taken from the plurality of area cameras (50, 52) is output and processed by one of the reading computer Device. The method of claim 1, A plurality of area cameras 50 and 52 are respectively installed on tops of positions corresponding to positions where the first and second lighting devices 20 and 22 are installed. Fault detection device.

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