AOI pattern detection device for light guide plate

Abstract

The application relates to the field of optical detection, in particular to an AOI pattern detection device for a light guide plate, which comprises a conveying belt and a main machine arranged on one side of the conveying belt, the conveying belt is used for conveying the light guide plate, the conveying belt is fixedly installed with a light shield cover, import and export for the light guide plate to pass through are arranged on the two sides of the light shield cover, a light source and a CCD camera are fixedly installed in the light shield cover, the CCD camera is used for shooting the light guide plate and sending the light guide plate to the main machine, the main machine is used for analyzing whether the light guide plate has defects, a plurality of avoiding openings are arranged on the belt surface of the conveying belt, the avoiding openings are arranged along the conveying direction of the conveying belt, the plurality of avoiding openings are arranged in the width direction of the conveying belt, a base is arranged on the bottom side of the conveying belt, the base is fixedly installed with a jacking mechanism, the jacking mechanism is fixedly installed with a plurality of jacking rods, and the jacking mechanism is used for driving the jacking rods to ascend and descend. The application has the effect of improving the accuracy of detection results.

Description

Technical Field

[0001] This application relates to the field of optical inspection, and in particular to an AOI pattern inspection device for light guide plates. Background Technology

[0002] In the field of light guide plate manufacturing, with the continuous advancement of technology, the requirements for quality inspection of light guide plates are becoming increasingly stringent. As a key component in many optical devices, the quality of the light guide plate directly affects the performance and usability of the entire device.

[0003] During the production of light guide plates, after being imprinted by a nanoimprinter, the light guide plates are typically conveyed by a conveyor belt to an AOI (Automated Optical Inspection) device for testing. The AOI device inspects the light guide plates to determine if any defects are present. This inspection method is a relatively standard operating procedure in the production of light guide plates and, to a certain extent, meets the basic requirements for quality inspection.

[0004] However, since the light guide plate is made of transparent material, if there are scratches on the conveyor belt, the AOI graphic inspection device may mistakenly identify the scratches as defects on the light guide plate, resulting in misjudgment and affecting the accuracy of the inspection results. Summary of the Invention

[0005] To improve the accuracy of the detection results, this application provides an AOI graphic inspection device for light guide plates.

[0006] This application provides an AOI graphic inspection device for a light guide plate, which adopts the following technical solution:

[0007] An AOI (Automated Optical Inspection) device for light guide plates includes a conveyor belt and a main unit disposed on one side of the conveyor belt. The conveyor belt is used to transport the light guide plate. A light shield is fixedly installed on the conveyor belt. Both sides of the light shield have inlets and outlets for the light guide plate to pass through. A light source and a CCD camera are fixedly installed inside the light shield. The CCD camera is used to photograph the light guide plate and send the images to the main unit. The main unit is used to analyze whether there are defects in the light guide plate. The conveyor belt surface has multiple clearance openings. The clearance openings are arranged along the conveying direction of the conveyor belt and are spaced apart along the width direction of the conveyor belt. A base is disposed on the bottom side of the conveyor belt. A lifting mechanism is fixedly installed on the base. The lifting mechanism is fixedly installed with multiple lifting rods and is used to drive the lifting rods to rise and fall.

[0008] By adopting the above technical solution, an avoidance opening is made on the conveyor belt, and the lifting mechanism drives the lifting rod to raise and lower the light guide plate, so that the light guide plate is misaligned with the original conveyor belt surface. Then, the light guide plate is aligned by taking two photos with a CCD camera, which can eliminate misjudgments caused by conveyor belt scratches and improve the accuracy of light guide plate defect detection.

[0009] Optionally, the lifting mechanism includes a lifting cylinder and a support plate. The cylinder body of the lifting cylinder is fixedly installed on the top side of the base, and the piston rod of the lifting cylinder is connected to the support plate. The lifting cylinder is used to drive the support plate to rise and fall, and the lifting rod is vertically fixedly installed on the top surface of the support plate.

[0010] By adopting the above technical solution, the lifting cylinder drives the support plate to rise and fall, and the support plate drives the lifting rod to rise and fall, thereby facilitating the lifting rod to rise and fall.

[0011] Optionally, the bottom surface of the support plate is provided with a sliding groove, which is arranged along the conveying direction of the conveyor belt. A slider is slidably arranged inside the sliding groove. The piston rod of the lifting cylinder is fixedly connected to the slider. A first guide rod is provided at both ends of the sliding groove. The first guide rod is vertically fixedly installed on the base. A second guide rod is fixedly installed at the top of the first guide rod. The second guide rod is inclined from bottom to top towards the conveying direction of the conveyor belt. Both the first guide rod and the second guide rod are used to abut against the side wall of the support plate.

[0012] By adopting the above technical solution, during the upward movement of the support plate, the tilting of the second guide rod causes the support plate to move along the transmission direction of the conveyor belt, which in turn drives the lifting rod to move along the transmission direction of the conveyor belt. When the lifting rod lifts the light guide plate upward, the movement of the lifting rod along the transmission direction of the conveyor belt reduces the distance the light guide plate moves relative to the lifting rod, making it easier for the lifting rod to lift the light guide plate.

[0013] Optionally, a connecting seat is fixedly installed at the top of the lifting rod. The connecting seat has a rotating groove, and a shaft is rotatably inserted into the rotating groove. The central axis of the shaft is set along the conveying direction of the conveyor belt. A moving rod is fixedly installed on the shaft. The shaft is equipped with a reset component and a locking component. The reset component is used to allow the moving rod to rotate upward and tilt when it does not lift the light guide plate. The locking component is used to limit the rotation angle of the shaft.

[0014] By adopting the above technical solution, when the lifting rod rises, the moving rod supports the light guide plate to rise and rotate in the tilting direction, driving the light guide plate to move along the width direction of the conveyor belt, further offsetting the light guide plate from the original conveyor belt surface, which helps to reduce misjudgment caused by conveyor belt scratches.

[0015] Optionally, the reset assembly includes a limiting block, a first connecting rope, and a first counterweight. The limiting block is fixedly installed on the inner bottom wall of the rotating groove. The shaft has a limiting groove for the limiting block to enter. When the limiting block is at both ends of the limiting groove, the moving rod is inclined in one direction. One end of the first connecting rope is fixedly connected to the shaft, and the other end of the first connecting rope is fixedly connected to the first counterweight.

[0016] By adopting the above technical solution, the limiting block can limit the rotation angle of the shaft by sliding inside the limiting groove. When the moving rod rises to support the light guide plate, the moving rod rotates downward. When the moving rod moves downward and separates from the light guide plate, the first counterweight block drives the moving rod to rotate upward through the first connecting rope to reset.

[0017] Optionally, the lifting rods are distributed on both sides of the conveyor belt, and the shaft located on one side of the conveyor belt is allowed to rotate at a greater angle than the shaft located on the other side of the conveyor belt.

[0018] By adopting the above technical solution, since the shaft on one side of the conveyor belt allows a greater rotation angle than the shaft on the other side, the moving rods on both sides of the conveyor belt lift the light guide plate at different heights, causing the light guide plate to tilt. This tilted light guide plate allows the CCD camera to take pictures, improving detection accuracy.

[0019] Optionally, the locking assembly includes a locking plate, a second counterweight, and a second connecting rope. The locking plate is located at one end of the shaft, and the side of the locking plate away from the shaft is hinged to the connecting seat. The second counterweight is fixedly installed on the side of the locking plate near the shaft. The end of the shaft has a slot for the locking plate to enter. One end of the second connecting rope is fixedly connected to the side of the locking plate away from the shaft, and the other end of the second connecting rope is fixedly connected to the base.

[0020] By adopting the above technical solution, when the moving rod rises to the highest point, the second connecting rope is taut, and the locking plate is pulled out of the slot to unlock, making it easier for the moving rod to rotate under the pressure of the light guide plate; when the moving rod descends, the reset component drives it to reset so that the slot and the locking plate are aligned, and then the locking plate enters the slot and locks under the drive of the second counterweight.

[0021] Optionally, a shielding brush is fixedly installed on the inner top wall of the inlet and outlet.

[0022] By adopting the above technical solution, installing a shielding brush on the inner top wall of the inlet and outlet can reduce the amount of external light entering the light shield, reduce the interference of external light on the detection light guide plate of the AOI graphic inspection device, and improve the detection accuracy.

[0023] Optionally, a light sensor is fixedly installed on the inner wall of the light shield on the upstream side of the conveyor belt in the conveying direction. The light sensor is located at the edge of the inlet and outlet. The light sensor generates a light intensity signal based on the light intensity inside the light shield and sends it to the host. The host starts and stops the lifting mechanism based on the light intensity signal.

[0024] By adopting the above technical solution, the light sensor can generate a light intensity signal based on the light intensity inside the light shield and send it to the host. The host can then control the lifting mechanism, the light source, and the CCD camera to open and close based on the signal, thus enabling intelligent control of the equipment operation.

[0025] Optionally, a gap is left between the shielding brush and the top surface of the conveyor belt.

[0026] By adopting the above technical solution, friction caused by contact between the shielding brush and the top surface of the conveyor belt can be reduced when conveying the light guide plate, thereby reducing the wear of the conveyor belt and the shielding brush and extending their service life.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] An obstacle is opened on the conveyor belt, and a lifting mechanism and a lifting rod are installed. The lifting mechanism drives the lifting rod to raise and lower the light guide plate, so that the light guide plate is misaligned with the original conveyor belt surface. By comparing the photos taken before and after, it is easy to reduce misjudgment caused by conveyor belt scratches and improve the detection accuracy.

[0029] A movable rod is hinged to the lifting rod. When the lifting rod rises, the movable rod supports the light guide plate to rise and rotate, causing the light guide plate to move along the width of the conveyor belt. This further offsets the light guide plate from the original conveyor belt surface, making it easier to reduce misjudgments caused by conveyor belt scratches and improve detection accuracy. Attached Figure Description

[0030] Figure 1 This is a first-view structural schematic diagram of an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the overall structure from a second perspective of an embodiment of this application;

[0032] Figure 3 This is a partial structural schematic diagram of an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the lifting mechanism and lifting rod according to an embodiment of this application;

[0034] Figure 5 This is an exploded view of the lifting cylinder and the support plate in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the structure between the lifting rod and the moving rod in an embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Conveyor belt; 2. Main unit; 3. Light shield; 4. Light source; 5. CCD camera; 6. Base; 7. Lifting mechanism; 71. Lifting cylinder; 72. Support plate; 8. Lifting rod; 9. Inlet / outlet; 10. Clearance opening; 11. Blocking brush; 12. Slide groove; 13. Sliding block; 14. First guide rod; 15. Second guide rod; 16. Connecting seat; 17. Rotating groove; 18. Shaft; 19. Moving rod; 20. Reset assembly; 201. Limiting block; 202. First connecting rope; 203. First counterweight; 21. Locking assembly; 211. Card plate; 212. Second counterweight; 213. Second connecting rope; 22. Limiting groove; 23. Card slot; 24. Light sensor. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0038] This application discloses an AOI graphic inspection device for light guide plates.

[0039] Reference Figure 1 , Figure 2 An AOI (Automated Optical Inspection) device for light guide plates includes a conveyor belt 1, a main unit 2, a light shield 3, a light source 4, a CCD camera 5, a base 6, a lifting mechanism 7, and a lifting rod 8. The main unit 2 is located on one side of the conveyor belt 1, which transports the light guide plates. The light shield 3 is fixedly installed on the top side of the conveyor belt 1, and has inlets and outlets 9 on both sides for the light guide plates to pass through. The light source 4 and the CCD camera 5 are fixedly installed inside the light shield 3. The CCD camera 5 captures images of the light guide plates and sends them to the main unit 2, which analyzes the light guide plates for defects. When the main unit 2 detects a defect in a light guide plate, personnel conduct a re-inspection. If two consecutive light guide plates are found to be defective, the main unit 2 promptly issues an alarm to remind the light guide plate production line to be inspected and the fault located.

[0040] Reference Figure 3 , Figure 4 The conveyor belt 1 has multiple clearance openings 10 on its surface. These clearance openings 10 are arranged along the conveying direction of the conveyor belt 1 and are spaced apart along the width direction of the conveyor belt 1. A base 6 is located on the bottom side of the conveyor belt 1. A lifting mechanism 7 is fixedly mounted on the base 6, and a lifting rod 8 is fixedly mounted on the lifting mechanism 7. The lifting mechanism 7 drives the lifting rod 8 to rise and fall. This structural arrangement allows the lifting mechanism 7 to raise and lower the light guide plate via the lifting rod 8 during inspection, thus misaligning the light guide plate with the original surface of the conveyor belt 1. By comparing two images taken before and after by the CCD camera 5, misjudgments caused by scratches on the conveyor belt 1 can be reduced.

[0041] The conveyor belt 1 is typically made of wear-resistant rubber, and its transmission can be achieved by a motor driving rollers. The clearance opening 10 in the conveyor belt 1 is to provide space for the lifting rod 8 to rise and fall.

[0042] Reference Figure 1 , Figure 2 The light shield 3 is generally made of opaque plastic or metal plate, and its function is to prevent external light from interfering with the detection process. The size of the inlet and outlet 9 on both sides of the light shield 3 is determined according to the size of the light guide plate to ensure that the light guide plate can pass through smoothly. A shielding brush 11 is fixedly installed on the inner top wall of the inlet and outlet 9. The shielding brush 11 is usually made of soft bristles. A gap is left between the shielding brush 11 and the top surface of the conveyor belt 1, which can reduce the entry of external light and prevent friction with the conveyor belt 1.

[0043] Reference Figure 4 , Figure 5 The lifting mechanism 7 includes a lifting cylinder 71 and a support plate 72. The cylinder body of the lifting cylinder 71 is fixedly installed on the top side of the base 6, and the piston rod of the lifting cylinder 71 is connected to the support plate 72. The lifting cylinder 71 drives the support plate 72 to rise and fall, and the lifting rod 8 is vertically fixedly installed on the top surface of the support plate 72. The lifting cylinder 71 can be pneumatically driven, which has the advantages of fast response and high force.

[0044] A groove 12 is provided on the bottom surface of the support plate 72, and the groove 12 is set along the conveying direction of the conveyor belt 1. A slider 13 is slidably arranged inside the groove 12, and the piston rod of the lifting cylinder 71 is fixedly connected to the slider 13. The function of the groove 12 is to limit the movement direction of the slider 13. A first guide rod 14 is provided at both ends of the groove 12. The first guide rod 14 is vertically fixedly installed on the base 6, and a second guide rod 15 is fixedly installed at the top of the first guide rod 14. The second guide rod 15 is inclined from bottom to top towards the conveying direction of the conveyor belt 1. Both the first guide rod 14 and the second guide rod 15 are used to abut against the side wall of the support plate 72. The first guide rod 14 and the second guide rod 15 guide the support plate 72. Under the guidance of the second guide rod 15, the support plate 72 moves in the conveying direction of the conveyor belt 1. The support plate 72 drives the lifting rod 8 to move, which helps to reduce the possibility of the guide plate falling off after relative sliding between the lifting rod 8 and the lifting rod 8 when the lifting rod 8 lifts the guide plate.

[0045] Reference Figure 4 , Figure 6A connecting seat 16 is fixedly installed at the top of the lifting rod 8. The connecting seat 16 has a rotating groove 17, and a shaft 18 is rotatably inserted into the rotating groove 17. The central axis of the shaft 18 is set along the conveying direction of the conveyor belt 1. A moving rod 19 is fixedly installed on the shaft 18. A reset assembly 20 and a locking assembly 21 are installed on the shaft 18. The reset assembly 20 is used to allow the moving rod 19 to rotate upward and tilt when it does not lift the light guide plate. The locking assembly 21 is used to limit the rotation angle of the shaft 18.

[0046] Reference Figure 4 , Figure 6 The reset assembly 20 includes a limiting block 201, a first connecting rope 202, and a first counterweight 203. The limiting block 201 is fixedly installed on the inner bottom wall of the rotating groove 17, and the shaft 18 has a limiting groove 22 for the limiting block 201 to enter. When the limiting block 201 is at both ends of the limiting groove 22, the moving rod 19 is inclined in one direction. One end of the first connecting rope 202 is fixedly connected to the shaft 18, and the other end of the first connecting rope 202 is fixedly connected to the first counterweight 203.

[0047] The limiting block 201 slides inside the limiting groove 22 to limit the rotation angle of the shaft 18. When the lifting rod 8 rises, it drives the moving rod 19 to rise. When the moving rod 19 supports the light guide plate, it is squeezed downward by the light guide plate and rotates downward. When the moving rod 19 moves downward and separates from the light guide plate, the first counterweight 203 drives the moving rod 19 to rotate upward through the first connecting rope 202 to reset it.

[0048] Reference Figure 4 , Figure 6 The locking assembly 21 includes a locking plate 211, a second counterweight 212, and a second connecting rope 213. The locking plate 211 is located at one end of the shaft 18, and the side of the locking plate 211 away from the shaft 18 is hinged to the connecting seat 16. The second counterweight 212 is fixedly installed on the side of the locking plate 211 near the shaft 18, and the end of the shaft 18 has a slot 23 for the locking plate 211 to enter. One end of the second connecting rope 213 is fixedly connected to the side of the locking plate 211 away from the shaft 18, and the other end of the second connecting rope 213 is fixedly connected to the base 6.

[0049] When the moving rod 19 rises, the second connecting rope 213 tauts, and the second connecting rope 213 pulls the locking plate 211 out of the slot 23 to unlock it, so that the moving rod 19 can rotate under the pressure of the light guide plate; when the moving rod 19 falls, the reset component 20 drives it to reset so that the slot 23 is aligned with the locking plate 211, and then the locking plate 211 enters the slot 23 and locks under the action of the second counterweight 212.

[0050] Lifting rods 8 are distributed on both sides of the conveyor belt 1. The shaft 18 on one side of the conveyor belt 1 is allowed to rotate at a greater angle than the shaft 18 on the other side. When the moving rod 19 lifts the light guide plate, the different rotation angles of the shafts 18 on both sides of the conveyor belt 1 result in different heights at the top of the moving rods 19 on both sides of the conveyor belt 1, thus tilting the light guide plate. This tilting of the light guide plate allows the CCD camera 5 to take pictures, thereby improving detection accuracy.

[0051] Reference Figure 1 A light sensor 24 is fixedly installed on the inner wall of the light shield 3 on the upstream side of the conveyor belt 1 in the conveying direction. The light sensor 24 is located at the edge of the inlet / outlet 9. The light sensor 24 generates a light intensity signal based on the light intensity inside the light shield and sends it to the host 2. The host 2 then opens and closes the lifting mechanism 7 based on the light intensity signal. The light sensor 24 can be a photoresistor, which can change its resistance value according to the intensity of light, thereby generating a light intensity signal.

[0052] The implementation principle of the AOI graphic inspection device for a light guide plate in this embodiment is as follows: When the light guide plate is conveyed to the light shield 3 by the conveyor belt 1, the light sensor 24 detects the change in light intensity and sends the signal to the host 2. The host 2 then starts the lifting mechanism 7 after a delay. The CCD camera 5 first takes a picture of the light guide plate to determine whether it is damaged. Then, the lifting mechanism 7 drives the support plate 72 to rise through the lifting cylinder 71, and the lifting rod 8 rises accordingly. The moving rod 19 supports the light guide plate to rise. Since the moving rod 19 is slightly tilted when it is not squeezed by the light guide plate, it rotates in the tilting direction during the rise, causing the light guide plate to move along the width direction of the conveyor belt 1 and to offset the light guide plate from the original surface of the conveyor belt 1. Afterwards, the lifting mechanism 7 drives the light guide plate to fall, and the CCD camera 5 takes another picture of the light guide plate. The host 2 compares and analyzes the images taken before and after the two pictures to reduce misjudgments caused by scratches on the conveyor belt 1 and accurately determine whether there are defects in the light guide plate.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An AOI graphic inspection device for a light guide plate, comprising a conveyor belt (1) and a host (2) disposed on one side of the conveyor belt (1), wherein the conveyor belt (1) is used to transport the light guide plate, a light shield (3) is fixedly installed on the conveyor belt (1), and inlets and outlets (9) for the light guide plate to pass through are provided on both sides of the light shield (3), a light source (4) and a CCD camera (5) are fixedly installed inside the light shield (3), the CCD camera (5) is used to photograph the light guide plate and send the images to the host (2), and the host (2) is used to analyze whether there are defects in the light guide plate, characterized in that: The conveyor belt (1) has multiple clearance openings (10) on its surface. The clearance openings (10) are arranged along the conveying direction of the conveyor belt (1). The multiple clearance openings (10) are spaced apart along the width direction of the conveyor belt (1). A base (6) is provided on the bottom side of the conveyor belt (1). A lifting mechanism (7) is fixedly installed on the base (6). Multiple lifting rods (8) are fixedly installed on the lifting mechanism (7). The lifting mechanism (7) is used to drive the lifting rods (8) to rise and fall. A connecting seat (16) is fixedly installed at the top of the lifting rod (8). The connecting seat (16) has a rotating groove (17). A shaft (18) is rotatably inserted inside the rotating groove (17). The central axis of the shaft (18) is set along the conveying direction of the conveyor belt (1). A moving rod (19) is fixedly installed on the shaft (18). A reset component (20) and a locking component (21) are installed on the shaft (18). The reset component (20) is used to make the moving rod (19) rotate upward and tilt when the moving rod (19) does not lift the light guide plate. The locking component (21) is used to limit the rotation angle of the shaft (18).

2. The AOI graphic inspection device for a light guide plate according to claim 1, characterized in that: The lifting mechanism (7) includes a lifting cylinder (71) and a support plate (72). The cylinder body of the lifting cylinder (71) is fixedly installed on the top side of the base (6). The piston rod of the lifting cylinder (71) is connected to the support plate (72). The lifting cylinder (71) is used to drive the support plate (72) to rise and fall. The lifting rod (8) is vertically fixedly installed on the top surface of the support plate (72).

3. The AOI graphic inspection device for a light guide plate according to claim 2, characterized in that: The bottom surface of the support plate (72) is provided with a sliding groove (12), which is arranged along the conveying direction of the conveyor belt (1). A slider (13) is slidably arranged inside the sliding groove (12). The piston rod of the lifting cylinder (71) is fixedly connected to the slider (13). A first guide rod (14) is provided at both ends of the sliding groove (12). The first guide rod (14) is vertically fixedly installed on the base (6). A second guide rod (15) is fixedly installed at the top of the first guide rod (14). The second guide rod (15) is inclined from bottom to top towards the conveying direction of the conveyor belt (1). The first guide rod (14) and the second guide rod (15) are both used to abut against the side wall of the support plate (72).

4. The AOI graphic inspection device for a light guide plate according to claim 1, characterized in that: The reset assembly (20) includes a limiting block (201), a first connecting rope (202), and a first counterweight (203). The limiting block (201) is fixedly installed on the inner bottom wall of the rotating groove (17). The shaft (18) has a limiting groove (22) for the limiting block (201) to enter. When the limiting block (201) is at both ends of the limiting groove (22), the moving rod (19) is inclined in one direction. One end of the first connecting rope (202) is fixedly connected to the shaft (18), and the other end of the first connecting rope (202) is fixedly connected to the first counterweight (203).

5. The AOI graphic inspection device for a light guide plate according to claim 1, characterized in that: The conveyor belt (1) has two ends along its length and two sides along its width. The lifting rods (8) are distributed on both sides of the conveyor belt (1). The shaft (18) located on one side of the conveyor belt (1) is allowed to rotate at a greater angle than the shaft (18) located on the other side of the conveyor belt (1).

6. The AOI graphic inspection device for a light guide plate according to claim 1, characterized in that: The locking assembly (21) includes a locking plate (211), a second counterweight (212), and a second connecting rope (213). The locking plate (211) is located at one end of the shaft (18). The side of the locking plate (211) away from the shaft (18) is hinged to the connecting seat (16). The second counterweight (212) is fixedly installed on the side of the locking plate (211) near the shaft (18). The end of the shaft (18) is provided with a slot (23) for the locking plate (211) to enter. One end of the second connecting rope (213) is fixedly connected to the side of the locking plate (211) away from the shaft (18), and the other end of the second connecting rope (213) is fixedly connected to the base (6).

7. The AOI graphic inspection device for a light guide plate according to claim 1, characterized in that: A shielding brush (11) is fixedly installed on the inner top wall of the inlet / outlet (9).

8. The AOI graphic inspection device for a light guide plate according to claim 7, characterized in that: The light shield (3) is fixedly installed on the inner wall of the side upstream of the conveyor belt (1) with a light sensor (24). The light sensor (24) is located at the edge of the inlet and outlet (9). The light sensor (24) generates a light intensity signal according to the light intensity inside the light shield (3) and sends it to the host (2). The host (2) opens and closes the lifting mechanism (7) according to the light intensity signal.

9. An AOI graphic inspection device for a light guide plate according to claim 8, characterized in that: A gap is left between the shielding brush (11) and the top surface of the conveyor belt (1).

Images