A polarizer detection device

Abstract

This utility model discloses a polarizer inspection device, wherein the polarizer is placed on a conveying mechanism and transported to a slitting mechanism; a first optical inspection mechanism and a second optical inspection mechanism are positioned above / below the conveying mechanism. The first optical inspection mechanism detects the invisible ink arrow stamp pattern on the polarizer, while the second optical inspection mechanism is positioned behind the first optical inspection mechanism along the polarizer conveying direction and detects red and blue ink arrow stamp patterns, Mark marks, and NG defects on the polarizer. The inspection host is electrically connected to the first and second optical inspection mechanisms respectively and processes the inspection information from the first and second optical inspection mechanisms. The slitting mechanism is electrically connected to the inspection host and receives and classifies the polarizers of corresponding quality according to the OK / NG signals output by the inspection host. This utility model can detect invisible stamp patterns and monitor the fixed arrow stamp positions on the polarizer, achieving the effect of intercepting film reflection in the sheet.

Description

Technical Field

[0001] This utility model belongs to the field of polarizing film optical detection technology, and in particular relates to a polarizing film detection device. Background Technology

[0002] A polarizer, also known as a light polarizer, is primarily composed of a composite of PVA film, TAC film, protective film, release film, and pressure-sensitive adhesive. In recent years, with the continuous development of the social economy, liquid crystal display technology has been applied in various fields. The attachment of polarizers is a crucial component in the production of liquid crystal displays. In a liquid crystal display module, two polarizers are attached to opposite sides of a glass substrate. The lower polarizer converts the light beam generated by the backlight into polarized light, while the upper polarizer analyzes the polarized light modulated by the liquid crystal, creating contrast and thus producing the displayed image.

[0003] In the production process of polarizers, due to the need for automated production and cost reduction, polarizer manufacturers have adopted Automatic Optic Inspection (AOI) devices to detect defects on the surface of the polarizer. The AOI device inspects the surface of the polarizer for defects and uses a marking machine to print special marks (referred to as Mark marks) on the locations of NG (Not Good) defects.

[0004] Currently, in the production process of polarizers, various panel manufacturers print arrow-shaped stamps on the protective film / release film of the polarizer according to their needs. However, the printing requirements differ between manufacturers; some require invisible ink, while others require red and blue ink. Under normal circumstances, automatic optical inspection systems cannot detect invisible ink under ordinary light sources, nor can they intercept defective or missing invisible ink stamps. For example, CN103278946A's inspection method for the front and back of polarizers is limited to detecting visible red and blue ink stamps and has no ability to detect the currently popular invisible ink stamps.

[0005] Furthermore, during the process of cutting roll polarizing film into sheet polarizing sheets, it is difficult to avoid the phenomenon of sheet flipping during the receiving process. Large-size polarizing sheets are less likely to flip during transportation due to weight and width limitations. However, small-size polarizing sheets are more prone to flipping during transportation due to factors such as feeding speed, air blowing, and feeding angle. In the polarizing sheet bonding process of LCD panel manufacturing, if the polarizing sheet is placed backwards, it will cause the machine to malfunction. Therefore, the polarizing sheet manufacturer should ensure that the film surface of each batch of sheet polarizing sheets is consistent before shipping. Because the batch size of finished sheet products is large, the probability of sheet flipping after cutting is high, especially for small-size polarizing sheets, where the flipping probability is extremely high and the countermeasures are poor. In addition, differences in personnel's sampling inspection methods make effective interception impossible, resulting in abnormal polarizing sheets being lost to customers, leading to customer complaints and claims, and also affecting the customer's production timeliness. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a polarizer detection device that can detect invisible markings and monitor the fixed marking position on the polarizer to achieve the effect of intercepting the reflection of the sheet film.

[0007] To achieve the above objectives, this utility model is implemented using the following solution: This utility model provides a polarizer detection device, comprising: The polarizer is placed on the conveying mechanism and transported to the slitting mechanism; An automatic optical inspection mechanism includes a first optical inspection mechanism, a second optical inspection mechanism, and an inspection host. The first and second optical inspection mechanisms are positioned above and below the conveying mechanism. The first optical inspection mechanism is used to inspect invisible ink arrow stamps on the polarizer. The second optical inspection mechanism is positioned behind the first optical inspection mechanism along the polarizer conveying direction and is used to inspect red and blue ink arrow stamps, Mark marks, and NG defects on the polarizer. The inspection host is electrically connected to the first and second optical inspection mechanisms respectively and is used to process the inspection information from the first and second optical inspection mechanisms. The slicing mechanism is electrically connected to the inspection host and is used to receive and classify polarizers of corresponding quality according to the OK / NG signals output by the inspection host.

[0008] Furthermore, the first optical inspection agency includes: An ultraviolet light source is used to emit ultraviolet light to illuminate a polarizer; The first camera is used to capture the invisible ink arrow stamp pattern that appears on the polarizer when exposed to ultraviolet light, and transmits the image of the invisible ink arrow stamp pattern to the detection host.

[0009] Furthermore, the second optical inspection agency includes: Natural light source, used to emit natural light that passes through the polarizer from below; The second camera is used to capture red and blue ink arrow stamps, Mark marks, and NG defects on the polarizer when exposed to natural light, and transmits the images of these defects to the inspection host.

[0010] Furthermore, the first camera was a black-and-white industrial camera.

[0011] Furthermore, the second camera is a monochrome industrial camera.

[0012] Furthermore, the detection host is equipped with a UI interface to display arrow stamp type, mark mark and NG type defects.

[0013] Furthermore, the inspection host is equipped with a character recognition system, which is used to monitor the integrity and position of the arrow stamp type, and to determine NG defects and Mark marks, and output OK / NG signals.

[0014] Furthermore, the slitting mechanism is equipped with a good product receiving tray and a defective product receiving tray, which are used to collect polarizers of the quality corresponding to OK / NG signals, respectively. Beneficial effects

[0015] This invention can detect invisible ink arrow stamps printed on polarizers by using ultraviolet light from the first optical inspection mechanism, and can detect red and blue ink arrow stamps, Mark marks, and NG defects printed on polarizers by using natural light penetration from the second optical inspection mechanism, thus greatly reducing labor costs.

[0016] This invention monitors the integrity and position of the arrow stamp type through the character recognition system on the detection host, and judges NG defects and Mark marks as NG, outputting OK / NG signals. It also has the function of intercepting arrow stamp defects and intercepting film reflection sheets to prevent them from flowing to the customer and reduce unnecessary customer complaints and return losses. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a polarizer detection device provided in an embodiment of the present invention; Figure 2 This is an example of an arrow-shaped pattern printed on a polarizing film according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of a polarizing film detection device for detecting invisible ink arrow stamps, provided in an embodiment of this utility model. Figure 4This is a schematic diagram illustrating the working principle of a polarizer detection device for detecting red and blue ink arrow stamps, provided in an embodiment of this utility model. In the diagram: 10, conveying mechanism; 20, detection host; 30, slicing mechanism; 40, first optical detection mechanism; 50, second optical detection mechanism; 11, first imprinting area; 21, second imprinting area; 31, third imprinting area; 41, fourth imprinting area; 42, fifth imprinting area; 51, sixth imprinting area; 52, seventh imprinting area; 61, eighth imprinting area; 62, ninth imprinting area; A1, first camera; A2, second camera; B1, ultraviolet light source; B2, natural light source. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this utility model, and should not be used to limit the protection scope of this utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0021] like Figure 1As shown, this embodiment provides a polarizer inspection device, comprising a conveying mechanism 10, an automatic optical inspection mechanism, and a segmentation mechanism 30. The conveying mechanism 10 consists of rollers and a conveyor belt; all other identical rollers and conveyor belts are part of the conveying mechanism 10. The polarizer is placed on the conveying mechanism 10 and conveyed from left to right to the segmentation mechanism 30. The automatic optical inspection mechanism comprises a first optical inspection mechanism 40, a second optical inspection mechanism 50, and an inspection host 20. The first optical inspection mechanism 40 and the second optical inspection mechanism 50 are positioned above / below the conveying mechanism 10. The first optical inspection mechanism 40 is used to detect invisible ink arrow stamps on the polarizer. The second optical inspection mechanism 50 is positioned behind the first optical inspection mechanism 40 along the polarizer conveying direction and is used to detect red and blue ink arrow stamps, Mark marks, and NG defects on the polarizer. The inspection host 20 is electrically connected to both the first optical inspection mechanism 40 and the second optical inspection mechanism 50 and is used to process the inspection information from the first optical inspection mechanism 40 and the second optical inspection mechanism 50. The slicing mechanism 30 is electrically connected to the detection host 20 and is used to classify and sort polarizers of corresponding quality according to the OK / NG signals output by the detection host 20 after processing. Example 2

[0022] like Figure 1 As shown, this embodiment provides a polarizer detection device, which consists of a conveying mechanism 10, an automatic optical detection mechanism, and a slicing mechanism 30.

[0023] Specifically, the conveying mechanism 10 consists of rollers and a conveyor belt. All other identical rollers and conveyor belts are part of the conveying mechanism 10. The polarizing film is placed on the conveying mechanism 10 and conveyed from left to right to the slitting mechanism 30. In addition, a suction and pulling device is provided at the front end of the conveying mechanism 10 to pull the polarizing film to the conveying mechanism 10 at a fixed frequency. This is prior art and will not be described in detail here.

[0024] The automated optical inspection mechanism comprises a first optical inspection mechanism 40, a second optical inspection mechanism 50, and an inspection host 20. The first optical inspection mechanism 40 and the second optical inspection mechanism 50 are positioned above / below the conveying mechanism 10. The first optical inspection mechanism 40 is used to inspect the invisible ink arrow stamp pattern on the polarizer: the first optical inspection mechanism consists of an ultraviolet light source B1 and a first camera A1. The ultraviolet light source B1 is used to emit ultraviolet light to irradiate the polarizer, and the first camera A1 is used to capture the invisible ink arrow stamp pattern that appears on the polarizer under ultraviolet light irradiation, and transmit the invisible ink arrow stamp pattern image to the inspection host 20. The second optical inspection unit 50 is positioned behind the first optical inspection unit 40 along the polarizer transport direction. It is used to inspect red and blue ink arrowhead-shaped stamps, Mark marks, and NG (Not From Good) defects on the polarizer. The second optical inspection unit consists of a natural light source B2 and a second camera A2. The natural light source B2 emits natural light that penetrates the polarizer from below. The second camera A2 captures the red and blue ink arrowhead-shaped stamps, Mark marks, and NG defects visible on the polarizer under the penetration of natural light and transmits the images of these defects to the inspection host. Both the first camera A1 and the second camera A2 are monochrome industrial cameras. The inspection host 20 is electrically connected to the first optical inspection mechanism 40 and the second optical inspection mechanism 50 respectively, and is used to process the inspection information of the first optical inspection mechanism 40 and the second optical inspection mechanism 50. The inspection host 20 is equipped with a UI interface for displaying arrow stamps, Mark marks and NG defects. The defect information, Mark marks and arrow stamps detected by the two optical inspection mechanisms are merged through software processing and displayed on the UI (User Interface) through different channels. The inspection host is equipped with a character recognition system (existing technology, so it will not be described in detail) for monitoring the integrity and position of the arrow stamps and judging NG defects and Mark marks, and outputting OK / NG signals.

[0025] The slitting mechanism 30 is electrically connected to the inspection host 20 and is used to receive and classify polarizers of the corresponding quality according to the OK / NG signals output by the inspection host 20. The slitting mechanism 30 is equipped with a good product receiving tray and a defective product receiving tray, which are used to collect polarizers of the corresponding quality of the OK / NG signals.

[0026] Working principle: When the polarizer coated with an invisible arrow-shaped stamp passes through the first optical inspection mechanism 40, ultraviolet light emitted by the ultraviolet light source B1 illuminates the polarizer. The invisible ink, excited by the reflected ultraviolet light, produces a fluorescent effect, causing the stamp to emit white light distinct from the background color of the polarizer. This is captured by the first camera A1, processed internally, and transmitted to the inspection host 20 UI (User Interface) to obtain the desired image of the polarizer stamp. Immediately after passing through the first optical inspection mechanism 40, the polarizer passes through the second optical inspection mechanism 50. Natural light emitted by the natural light source B2 penetrates the polarizer. The red and blue ink arrow-shaped stamps, Mark marks, and NG defects on the polarizer block some of the light, allowing them to be captured by the second camera A2. However, the invisible arrow-shaped stamps are not visible under natural light and cannot be captured by the second camera A2.

[0027] Due to the unique nature of ultraviolet light sources, fluorescence only occurs when the invisible ink is irradiated. Therefore, the first optical inspection unit 40 has limitations; it can only detect invisible arrow stamp patterns but cannot detect mark markings or other NG defects on the film surface. Furthermore, the first optical inspection unit 40 cannot detect red and blue ink arrow stamp patterns. To address this, a second optical inspection unit 50 is added after the first optical inspection unit 40. The second optical inspection unit 50 can detect invisible arrow stamp patterns while also intercepting mark markings and some NG defects on the film surface, thus compensating for the shortcomings of the first optical inspection unit 40. It also has the effect of detecting and monitoring red and blue ink arrow stamp patterns.

[0028] Both the first camera A1 and the second camera A2 are monochrome industrial cameras. While color industrial cameras can capture the color information of the object being photographed, monochrome industrial cameras can only capture the brightness information and cannot capture color information. Due to the special properties of ultraviolet light, when it shines on the invisible ink on the film surface, it produces a fluorescent effect, emitting a very bright white light. If the first camera A1 is a monochrome industrial camera, a high-brightness white arrow pattern will appear in the image. Apart from the arrow pattern, the rest of the film background will appear black, resulting in good detection of the invisible stamp pattern. If the first camera A1 is a color industrial camera, the detection of the arrow pattern will be affected by dirt or residue on the film surface.

[0029] After the character recognition system inside the inspection host 20 successfully recognizes the arrow stamp pattern, it outputs an OK signal to the slitting mechanism 30. The slitting mechanism 30 then classifies the current polarizer into the good products category and sends it to the good products receiving tray. The inspection host 20 uses internal software to process and judge the quality of defects appearing on each sheet, and monitors the arrow stamp pattern (if the arrow stamp pattern is incomplete, it will also enter the quality judgment, and the judgment category is NG). The quality judgment system judges NG defects, Mark marks, and incomplete arrow stamps in an "OR" processing method. That is, if any of the above categories appear on the sheet, it should be classified as a defective product, and an NG signal should be output to the slitting mechanism 30. The slitting mechanism 30 then classifies the current polarizer into the defective products category and sends it to the defective products receiving tray.

[0030] The first optical inspection unit 40 and the second optical inspection unit 50 can be used independently or in combination. In other words, this polarizer inspection device is not only suitable for the inspection of polarizers with red and blue ink arrow stamps, but also for the inspection of polarizers with invisible ink arrow stamps.

[0031] Furthermore, this polarizer inspection device can perform polarizer film reverse inspection based on the arrow stamp pattern printed on the polarizer and supplemented by the machine operation mode. The process is as follows: like Figure 3 As shown, polarizing film with arrow-shaped stamps first passes through the first optical inspection mechanism 40. Since the first optical inspection mechanism 40 only detects invisible stamps, before loading the polarizing film, the operator must first confirm whether the color of the arrow-shaped stamps on this batch of polarizing film is invisible ink. If it is an invisible ink arrow-shaped stamp, both the first optical inspection mechanism 40 and the second optical inspection mechanism 50 must be turned on simultaneously; if it is a red-blue ink arrow-shaped stamp, only the second optical inspection mechanism 50 needs to be turned on while the first optical inspection mechanism 40 is turned off. The opening and closing of the optical inspection mechanisms are set by internal software logic. Operators only need to select the invisible stamp detection mode and the red-blue stamp detection mode on the UI (User Interface) of the inspection host to control the opening / closing of the optical inspection mechanisms, without the need for manual power-on / off operation.

[0032] Figure 3 ① in the image represents the first polarizer from left to right in the automatic optical inspection mechanism. Subsequent polarizers ② and ③ are numbered accordingly. It should be noted that... Figure 3In the diagram, ①②③ are used to describe the order in which the three polarizers pass through the automatic optical inspection mechanism, not to represent the printed patterns or numbers on the polarizers. In polarizers ①②, the first printing area 11 and the second and third printing areas 21 are both located in the upper right corner, and the printed character K1 is within each printing area. It should be noted that the positions of the printing areas are fixed within the same batch of materials, and the printed stamps must also be within the same printing area. The stamp K1 shown in the diagram is an example pattern and does not represent all stamp patterns. Furthermore, the first printing area 11 and the second printing area 21 in the diagram are not fixed printing areas for all types of polarizers; they are only used as examples to illustrate the embodiments disclosed in this disclosure.

[0033] Due to the fixed and identical nature of the arrow stamp type, after personnel confirm the film surface before loading, the film surface will be oriented to the same side according to the subsequent packaging method. In other words, the film surface orientation and arrow stamp position are determined by the operation method and will not be changed afterwards. Therefore, the software parameter configuration in the detection host 20 will determine the position of the arrow stamp to be detected according to the different operation methods. Figure 2 The example of the arrow stamp pattern shown in the figure shows the printing area of ​​the arrow stamp and the serial number outside the dashed frame. There are also non-printing areas with fixed positions on the long side AD and the short side CD of the polarizer. It should be noted that the example in the figure is only used to give a simple explanation of the embodiment of the disclosed content and does not represent the actual arrow stamp pattern and the arrow stamp printing area. The arrow stamp printing pattern needs to be defined according to different products and sizes. The arrow stamp patterns corresponding to different sizes and products are also different. The arrow stamp pattern may be numbers, letters and other combinations.

[0034] Figure 3 The first marking area 11 and the second marking area 21 on the intermediate polarizer ①② are in the correct feeding direction, and the marking pattern K1 is in the correct marking area. After the polarizer passes through the first optical inspection mechanism 40, the first camera A1 captures the marking pattern K1 in a fixed position area and identifies the marking pattern through the character recognition system of the software. If the character matching is successful, it is determined that the sheet is not a film-reflective sheet. Then, the second optical inspection mechanism 50 detects the Mark mark on the film surface. If there is no Mark mark on the polarizer, it means that the polarizer has neither film reflection nor Mark. The inspection host 20 will output an OK signal to the slitting mechanism 30. After the polarizer is normal, it flows into the good product receiving tray. If there is a Mark mark on the polarizer, it means that although the polarizer has no film reflection, it has a serious defect. The inspection host 20 will output an NG signal to the slitting mechanism 30. The polarizer flows into the defective product receiving tray.

[0035] Figure 3The arrow-printed pattern on the intermediate polarizer ③ has changed compared to polarizers ① and ②, and the position of the arrow-printed stamp is not in the correct arrow-printing area. This indicates that the film surface of polarizer ③ has been flipped, causing its arrow-printing position to change. When polarizer ③ passes through the first optical inspection mechanism 40, the first camera A1 captures a blank arrow-printed pattern in the correct arrow-printing area. If there is no arrow-printed pattern in this area, it will be directly judged as NG. It is possible to determine that the polarizer is a film-reflective sheet without going through the character recognition system of the software. Then, the second optical inspection mechanism 50 detects the mark on the film surface. If there is no mark on the polarizer, it means that the polarizer has film reflection but no mark. The inspection host 20 will output an NG signal to the slitting mechanism 30, and the polarizer will flow into the defective product receiving tray. If there is a mark on the polarizer, it means that the polarizer has both film reflection and serious defects. The inspection host 20 will output an NG signal to the slitting mechanism 30, and the polarizer will flow into the defective product receiving tray.

[0036] Figure 4 The diagram primarily illustrates the film reflection detection of red and blue ink arrow stamps and dual arrow stamps: Assuming the arrow stamp pattern color is confirmed to be red and blue ink, when the polarizer passes through the first optical detection mechanism 40, the violet light source B1 and the first camera A1 are in a closed state. This state is determined by the arrow stamp detection parameters selected by the operator and requires no manual intervention. Figure 4 The fourth and sixth arrow-printed areas 41 and 51 of the polarizers ① and ② shown are sprayed with the character N1 arrow-printed pattern, and the fifth and seventh arrow-printed areas 42 and 52 are sprayed with the character M1 arrow-printed pattern. It should be noted that the arrow-printed pattern is not limited to one area and may contain arrow-printed characters from multiple areas. When there are arrow-printed characters from multiple areas, the character composition must be different and cannot be completely the same.

[0037] During the detection, it was detected Figure 4 On polarizer ①, the arrow pattern N1 is printed in the corresponding fourth arrow pattern area 41, and the arrow pattern M1 is printed in the corresponding fifth arrow pattern area 42. On polarizer ②, the arrow pattern N1 is printed in the corresponding sixth arrow pattern area 51, and the arrow pattern M1 is printed in the corresponding seventh arrow pattern area 52. At this time, polarizers ① and ② are normal non-reflective films. According to the normal film orientation, the arrow pattern N1 should also be detected in the eighth arrow pattern area 61 of polarizer ③, and the arrow pattern M1 should also be detected in the ninth arrow pattern area 62. However, at this time, the characters appearing in the corresponding arrow pattern areas of polarizer ③ are opposite to the characters appearing on the actual normal film surface, and the arrow patterns have undergone mirror rotation. Compared to Figure 3The difference is that the arrow patterns N1 and M1 are swapped in opposite arrow printing areas. That is, arrow pattern N1 appears in the arrow printing area where the original arrow pattern M1 was located, and arrow pattern M1 appears in the arrow printing area where the original arrow pattern N1 was located. According to the process, the patterns in the arrow printing areas are acquired first. At this time, the two arrow patterns are swapped in position and can be detected. When a film reflection occurs, the arrow pattern acquired in the first step of the arrow printing area cannot intercept the film reflection sheet. When there are arrow patterns in both arrow printing areas, the next step is the character recognition system, which matches the arrow templates in different arrow printing areas with the detected arrow patterns. At this time, the arrow pattern M1 in the eighth arrow printing area 61 cannot be matched with the original arrow template N1. The judgment system of the detection host 20 will output an NG signal to the slitting mechanism 30. The slitting mechanism 30 will sort this type of polarizer to the defective product receiving tray for film reflection sheet interception.

[0038] In summary, this polarizer inspection device can detect invisible ink arrow stamps printed on polarizers by using ultraviolet light from the first optical inspection mechanism, and can detect red and blue ink arrow stamps, Mark marks, and NG defects printed on polarizers by using natural light penetration from the second optical inspection mechanism. It is applicable not only to arrow patterns printed with ordinary red and blue ink, but also to arrow patterns printed with invisible ink, and is equally applicable to single and multiple arrow patterns. This shortens the time for manual re-inspection and saves a lot of labor costs. The character recognition system on the inspection host monitors the integrity and position of the arrow stamps and judges NG defects and Mark marks, outputting OK / NG signals. It also has the function of intercepting arrow stamp defects and intercepting film reflection sheets, feeding back to the front-end cutting process for improvement, preventing film reflection sheets from flowing to the customer, and reducing unnecessary customer complaints and return losses.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A polarizer detection device, characterized in that, include: The polarizer is placed on the conveying mechanism and transported to the slitting mechanism; An automatic optical inspection mechanism includes a first optical inspection mechanism, a second optical inspection mechanism, and an inspection host. The first and second optical inspection mechanisms are positioned above and below the conveying mechanism. The first optical inspection mechanism is used to inspect invisible ink arrow stamps on the polarizer. The second optical inspection mechanism is positioned behind the first optical inspection mechanism along the polarizer conveying direction and is used to inspect red and blue ink arrow stamps, Mark marks, and NG defects on the polarizer. The inspection host is electrically connected to the first and second optical inspection mechanisms respectively and is used to process the inspection information from the first and second optical inspection mechanisms. The slicing mechanism is electrically connected to the inspection host and is used to receive and classify polarizers of corresponding quality according to the OK / NG signals output by the inspection host.

2. The polarizer detection device according to claim 1, characterized in that, The first optical testing organization includes: An ultraviolet light source is used to emit ultraviolet light to illuminate a polarizer; The first camera is used to capture the invisible ink arrow stamp pattern that appears on the polarizer when exposed to ultraviolet light, and transmits the image of the invisible ink arrow stamp pattern to the detection host.

3. The polarizer detection device according to claim 1, characterized in that, The second optical inspection agency includes: Natural light source, used to emit natural light that passes through the polarizer from below; The second camera is used to capture red and blue ink arrow stamps, Mark marks, and NG defects on the polarizer when exposed to natural light, and transmits the images of these defects to the inspection host.

4. The polarizer detection device according to claim 2, characterized in that, The first camera was a black-and-white industrial camera.

5. The polarizer detection device according to claim 3, characterized in that, The second camera is a monochrome industrial camera.

6. The polarizer detection device according to claim 1, characterized in that, The inspection host is equipped with a UI interface to display arrow stamp type, mark mark and NG type defects.

7. The polarizer detection device according to claim 1, characterized in that, The inspection host is equipped with a character recognition system, which is used to monitor the integrity and position of the arrow stamp, and to determine NG defects and Mark marks, and output OK / NG signals.

8. The polarizer detection device according to claim 5, characterized in that, The slitting mechanism is equipped with a good product receiving tray and a defective product receiving tray, which are used to collect polarizers of the quality corresponding to OK / NG signals, respectively.

Images