Light guide plate testing device and method

Abstract

The invention relates to a light guide plate testing device and method, and belongs to the technical field of light guide plate testing, and the light guide plate testing device comprises a conveying mechanism which is sequentially provided with a cleaning station and a detection station along the light guide plate conveying direction; when the light guide plate passes through the cleaning station, the light emitting surface of the light guide plate faces the cleaning mechanism, and the cleaning mechanism is used for cleaning the light emitting surface; the testing mechanism is arranged at the detection station and comprises a light source and a detection lens, when the light guide plate reaches the detection station, the light-emitting surface faces the detection lens, and the light-incident side face faces the light source; the cleaning mechanism comprises a gluing assembly, and the gluing assembly is used for making contact with the light emitting face so that impurities attached to the light emitting face can be transferred to the gluing assembly. According to the light guide plate testing device, the gluing assembly is adopted to make contact with the light emitting face of the light guide plate in the conveying process of the light guide plate, so that surface impurities are directly adhered and transferred, and clean and reliable surface conditions are provided for subsequent optical performance detection.

Description

Technical Field

[0001] This invention belongs to the field of light guide plate testing technology, specifically relating to a light guide plate testing device and method. Background Technology

[0002] In the production and quality inspection process of light guide plates, cleaning the surface of the light guide plate, especially the light-emitting surface, before formal optical testing is a crucial preliminary step to ensure the accuracy of its optical performance test results. Currently, the cleaning methods commonly used in the industry mainly include air blowing dust removal and mechanical roller brush cleaning. Air blowing uses compressed air to sweep the surface and is suitable for removing loose dust; while for more adherent microparticles or fibers, it mostly relies on rotating roller brush assemblies set up at the cleaning station of the testing line. Through physical contact and friction between the roller brush and the surface of the light guide plate, contaminants are peeled off and swept away from the smooth light-emitting surface.

[0003] However, this roller brush-based cleaning technology has inherent and insurmountable technical defects: during the continuous cleaning process, the surface fibers of the roller brush will continuously accumulate contaminants detached from the light guide plate. If it is not cleaned in a timely and thorough manner, these accumulated contaminants are very likely to fall off in subsequent cleaning operations and re-adhere to the surface of the light guide plate to be cleaned, making the cleaning process itself a new source of pollution. Summary of the Invention

[0004] To address the problem that existing roller brushes accumulate contaminants detached from the light guide plate during continuous cleaning, and if they are not cleaned promptly and thoroughly, these accumulated contaminants are easily detached during subsequent cleaning operations and re-adhere to the surface of the light guide plate to be cleaned, making the cleaning process itself a new source of contamination, this solution provides a light guide plate testing device and method.

[0005] The objective of this invention can be achieved through the following technical solutions: In a first aspect, embodiments of the present invention provide a light guide plate testing device for detecting the optical performance of a light guide plate. The light guide plate includes a light-emitting surface and a light-incident surface adjacent to the light-emitting surface. The light guide plate testing device includes: a conveying mechanism for conveying the light guide plate, wherein a cleaning station and a testing station are sequentially arranged along the direction of conveying the light guide plate; a cleaning mechanism disposed at the cleaning station, wherein when the light guide plate passes the cleaning station, its light-emitting surface faces the cleaning mechanism, and the cleaning mechanism is used to perform a cleaning operation on the light-emitting surface; and a testing mechanism disposed at the testing station, including a light source and a testing lens, wherein when the light guide plate reaches the testing station, its light-emitting surface faces the testing lens, and its light-incident surface faces the light source; wherein the cleaning mechanism includes an adhesive component for contacting the light-emitting surface to transfer impurities attached to the light-emitting surface to the adhesive component.

[0006] As a preferred embodiment of the present invention, the adhesive assembly includes: a mounting frame, a first rotating shaft and a second rotating shaft, both the first rotating shaft and the second rotating shaft being rotatably connected to the mounting frame, the first rotating shaft being used to sleeve the adhesive roll paper, and the second rotating shaft being used to sleeve the take-up paper tube; The first rotating shaft is positioned above the cleaning station, and a cleaning gap is formed between the first rotating shaft and the conveying mechanism for the light guide plate to pass through; the second rotating shaft is positioned above the first rotating shaft; the adhesive paper released from the adhesive roll has its outer adhesive surface facing outward on the first rotating shaft and its outer adhesive surface facing inward on the second rotating shaft.

[0007] As a preferred embodiment of the present invention, the adhesive assembly further includes a transmission component connected between the first rotating shaft and the second rotating shaft, wherein the first rotating shaft and the second rotating shaft rotate synchronously through the transmission component.

[0008] As a preferred embodiment of the present invention, the transmission component includes a first gear connected to the first rotating shaft and a second gear connected to the second rotating shaft, wherein the first gear and the second gear mesh. Alternatively, the transmission component may include a first transmission wheel connected to the first rotating shaft and a second transmission wheel connected to the second rotating shaft, as well as a transmission belt connected to the first transmission wheel and the second transmission wheel.

[0009] As a preferred embodiment of the present invention, the conveying mechanism includes a conveyor belt and a conveyor tray. The cleaning station and the inspection station are both located on the conveyor belt. The conveyor belt is used to carry the conveyor tray, and the conveyor tray is used to carry the light guide plate. The conveying tray is provided with a transmission rack on both sides, and a rotatable transmission gear is provided on both sides of the cleaning gap. The transmission gear is connected to the first rotating shaft. When the conveying tray is conveyed to the cleaning gap, the transmission rack and the transmission gear engage, so that the transmission gear rotates with the conveying tray and drives the first rotating shaft to rotate.

[0010] As a preferred embodiment of the present invention, the conveying tray includes: a base plate, and a first side plate, a second side plate, and a third side plate connected to the base plate; the light guide plate includes a reflective surface disposed opposite to the light emitting surface. When the light guide plate is placed on the conveying tray, the reflective surface is opposite to the base plate, and the three non-light-incident sides of the light guide plate, excluding the light-incident side, are opposite to the first side plate, the second side plate, and the third side plate, respectively. The thickness of the first side plate, the second side plate, and the third side plate is less than the thickness of the light guide plate.

[0011] As a preferred embodiment of the present invention, the rotational tangential direction of the first rotating shaft driving the adhesive roll at the cleaning gap is the same as the conveying direction of the light guide plate in the conveying mechanism.

[0012] As a preferred embodiment of the present invention, the adhesive assembly further includes: a movable plate, a first synchronous pulley, a second synchronous pulley, a third synchronous pulley, a synchronous belt, and a first elastic element and a second elastic element; the mounting bracket is provided with a first sliding groove and a second sliding groove; the movable plate is movably disposed along the first sliding groove, and the first rotating shaft and the second rotating shaft are rotatably connected to the movable plate, the movable plate being able to drive the first rotating shaft and the second rotating shaft to move closer to or away from the cleaning gap in a direction perpendicular to the light guide plate; the first synchronous pulley is coaxially connected to the first rotating shaft, the second synchronous pulley is coaxially connected to the transmission gear, and the third... The timing pulley is movably disposed along the second groove, and the timing belt is wound around the first timing pulley, the second timing pulley, and the third timing pulley; the third timing pulley is movable in the second groove in a direction perpendicular to the connecting line between the first timing pulley and the second timing pulley; the first elastic element is connected to the mounting bracket and the movable plate, and the first elastic element is used to provide elastic force to the movable plate in the direction of the cleaning gap; the second elastic element is connected to the mounting bracket and the third timing pulley, and the second elastic element is used to provide elastic force to the third timing pulley in a direction away from the connecting line between the first timing pulley and the second timing pulley.

[0013] As a preferred embodiment of the present invention, the cleaning mechanism further includes a pressure sensor and a control unit; the pressure sensor is disposed between the movable plate and the mounting bracket, or disposed on the force path of the first elastic member, for detecting the actual pressure applied by the first elastic member to the movable plate; the control unit is electrically connected to the pressure sensor and the drive motor of the conveying mechanism; The control unit is used to receive the signal from the pressure sensor, and when the actual pressure exceeds a preset pressure threshold, control the conveying mechanism to stop operating and / or issue an alarm signal.

[0014] In a second aspect, the present invention provides a light guide plate testing method, applied to the light guide plate testing apparatus described in the first aspect, comprising: Place the light guide plate to be tested on the conveyor tray and start the conveyor mechanism; During the conveying process, the transmission racks on both sides of the conveying tray engage with the transmission gears set at the cleaning station, so that the linear conveying motion of the conveying tray is synchronously converted into the rotational motion of the first rotating shaft, so that the adhesive roll rotates tangentially in the same direction as the conveying direction at the cleaning gap, and performs forward rolling cleaning on the light-emitting surface of the light guide plate that passes through. The cleaned light guide plate is then conveyed along the conveyor mechanism to the testing station, where the testing organization performs optical performance testing.

[0015] The beneficial effects of this invention are as follows: This invention provides a light guide plate testing device. By using an adhesive component to contact the light-emitting surface of the light guide plate during transport, surface impurities are directly adhered to and transferred. This solves the problem that in existing roller brushes, during continuous cleaning, surface fibers continuously accumulate contaminants detached from the light guide plate. If these contaminants are not cleaned in a timely and thorough manner, they are easily detached in subsequent cleaning operations and re-adhere to the surface of the light guide plate to be cleaned, making the cleaning process itself a new source of contamination. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the external structure of a light guide plate testing device according to the present invention; Figure 2 This is a schematic diagram of the first internal structure of the cleaning mechanism of a light guide plate testing device according to the present invention; Figure 3 This is a schematic diagram of the second internal structure of the cleaning mechanism of a light guide plate testing device according to the present invention; Figure 4This is a schematic diagram of the third internal structure of the cleaning mechanism of a light guide plate testing device according to the present invention; Figure 5 This is a flowchart of a light guide plate testing method according to the present invention.

[0018] Figure label: 10. Conveying mechanism; 20. Cleaning mechanism; 21. Mounting frame; 211. First chute; 212. Second chute; 22. First rotating shaft; 221. Adhesive paper roll; 222. First gear; 23. Second rotating shaft; 231. Take-up paper tube; 232. Second gear; 24. Movable plate; 241. First elastic element; 25. First synchronous pulley; 26. Second synchronous pulley; 27. Third synchronous pulley; 271. Second elastic element; 28. Synchronous belt; 30. Testing mechanism; 40. Light guide plate. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0020] Please see Figures 1 to 4 This embodiment provides a light guide plate testing device for detecting the optical performance of a light guide plate 40. The light guide plate 40 includes a light-emitting surface and a light-incident surface adjacent to the light-emitting surface. The light guide plate 40 testing device includes: a conveying mechanism 10 for conveying the light guide plate 40, with a cleaning station and a testing station arranged sequentially along the direction of conveying the light guide plate 40; a cleaning mechanism 20 disposed at the cleaning station, wherein the light-emitting surface of the light guide plate 40 faces the cleaning mechanism 20 when it passes the cleaning station, and the cleaning mechanism 20 is used to perform a cleaning operation on the light-emitting surface; and a testing mechanism 30 disposed at the testing station, including a light source and a testing lens, wherein the light-emitting surface of the light guide plate 40 faces the testing lens and the light-incident surface faces the light source when it reaches the testing station; wherein the cleaning mechanism 20 includes an adhesive component, which is used to contact the light-emitting surface to transfer impurities attached to the light-emitting surface to the adhesive component.

[0021] Understandably, in the production and quality inspection process of the light guide plate 40, cleaning the surface of the light guide plate 40, especially the light-emitting surface, before formal optical testing is a crucial preliminary step to ensure the accuracy of its optical performance test results. Currently, the online cleaning method commonly used in the industry is mainly mechanical wiping, typically a high-speed rotating soft roller brush. This relies on the physical contact and friction between the bristles and the surface of the light guide plate 40 to sweep away contaminants attached to the light-emitting surface. However, the dust, fibers, and other impurities that are removed from their original positions by the bristles may fall or bounce and re-attach to other parts of the surface of the light guide plate 40 under the influence of airflow, static electricity, or secondary contact of the bristles. In particular, the bristles themselves will accumulate contaminants after repeated use, becoming a continuous source of pollution and causing secondary pollution during the cleaning process. Based on this, this embodiment employs an adhesive component to form a contact cleaning method for removing impurities. The stronger surface adsorption of the adhesive material is used to capture and remove impurities. Specifically, the adhesive component included in the cleaning mechanism 20 of this embodiment contacts the light-emitting surface of the light guide plate 40 under controlled conditions. During or within the contact area, the adhesive component adheres to and transfers impurities on the light-emitting surface through its adhesive surface, completing the cleaning operation. The cleaned light guide plate 40 is then delivered by the conveying mechanism 10 to the downstream testing station. At the testing station, the light guide plate 40 is precisely fixed, with its light-incident side facing the light source of the testing mechanism 30, and its light-emitting surface facing the testing lens. The testing mechanism 30 is activated, and the light emitted from the light source couples into the light guide plate 40 from the light-incident side. After internal conduction and scattering, it exits from the cleaned light-emitting surface, and the resulting light field distribution is completely captured by the testing lens, thus providing raw image data for subsequent optical performance analysis. In this embodiment, the use of adhesive components for cleaning relies on the strong adsorption of the adhesive material to directly remove impurities. Compared to traditional wiping methods that rely on friction, this method can more effectively remove contaminants, especially tiny, lightweight, and electrostatically adsorbed ones, resulting in a more thorough cleaning. Furthermore, the use of adhesive components, based on a physical process of direct adhesion and transfer, directly captures and firmly adheres to impurities, reducing the possibility of impurities falling off during the cleaning process. This provides a more reliable and consistent cleaning effect for achieving reliable online cleaning without secondary pollution, laying a better foundation for subsequent high-precision optical inspection.

[0022] In some embodiments, the adhesive assembly includes: a mounting frame 21, a first rotating shaft 22, and a second rotating shaft 23. Both the first rotating shaft 22 and the second rotating shaft 23 are rotatably connected to the mounting frame 21. The first rotating shaft 22 is used to hold the adhesive roll 221, and the second rotating shaft 23 is used to hold the take-up paper tube 231. The first rotating shaft 22 is positioned above the cleaning station, and a cleaning gap is formed between the first rotating shaft 22 and the conveying mechanism 10 for the light guide plate 40 to pass through. The second rotating shaft 23 is positioned above the first rotating shaft 22. The adhesive paper released from the adhesive roll 221 has its outer adhesive surface facing outward on the first rotating shaft 22 and its outer adhesive surface facing inward on the second rotating shaft 23.

[0023] It is understood that in this embodiment, the strip adhesive roll 221 is used as a consumable, the first rotating shaft 22 is used as a working shaft, and the adhesive paper is guided and unfolded on its outer side with its adhesive surface facing outward, i.e. towards the light guide plate 40, forming an arc-shaped clean contact surface with strong adsorption force; the second rotating shaft 23 is used as a recycling shaft, located above the working shaft, for winding up the used adhesive paper; the arrangement of the first rotating shaft 22 and the second rotating shaft 23 ensures that the strong adhesive layer exposed at the first rotating shaft 22 is always clean, while the adhesive surface contaminated after use is automatically wrapped and hidden by the second rotating shaft 23 during the winding process to prevent it from contaminating the environment or equipment.

[0024] Specifically, the adhesive roll 221 is fitted onto the first rotating shaft 22, with its end extending out and then fixed to the take-up roll 231 on the second rotating shaft 23. Next, when the light guide plate 40, supported by the conveying mechanism 10, horizontally enters and passes through the cleaning gap formed by the surfaces of the first rotating shaft 22 and the conveying mechanism 10, its light-emitting surface makes rolling contact with the clean adhesive paper on the outside of the first rotating shaft 22. Under contact pressure, the strong adhesive surface of the adhesive paper directly and firmly adheres to and captures impurities on the light-emitting surface. As the light guide plate 40 continues to advance, driving the first rotating shaft 22 to rotate passively, new clean adhesive paper is pulled out from the adhesive roll 221 and continuously replenished to the working position. Simultaneously, the synchronously rotating second rotating shaft 23 rolls up the section of adhesive paper that has been used and has been contaminated with impurities, thus encapsulating and storing the contaminants, achieving continuous automatic renewal of the cleaning interface.

[0025] In some embodiments, the adhesive assembly further includes a transmission component connected between the first rotating shaft 22 and the second rotating shaft 23, wherein the first rotating shaft 22 and the second rotating shaft 23 rotate synchronously through the transmission component.

[0026] Specifically, the transmission component includes a first gear 222 connected to the first rotating shaft 22 and a second gear 232 connected to the second rotating shaft 23, wherein the first gear 222 and the second gear 232 mesh; or, the transmission component includes a first transmission wheel connected to the first rotating shaft 22 and a second transmission wheel connected to the second rotating shaft 23, and a transmission belt connected to the first transmission wheel and the second transmission wheel.

[0027] When the first rotating shaft 22 is driven to start rotating in preparation to release new clean adhesive paper, the rotational power is synchronously transmitted to the second rotating shaft 23 through the transmission component. Thus, while the first rotating shaft 22 rotates to release paper, the second rotating shaft 23, driven by the transmission component, rotates synchronously with a matching speed and direction to rewind the paper. During this process, the moving speed of the adhesive paper from the supply end to the recycling end is forced to remain consistent, thereby ensuring that the tension of the adhesive paper in the working section is constantly wound around the first rotating shaft 22, and that the waste material is tightly and neatly wound onto the rewinding paper tube 231.

[0028] In some embodiments, the conveying mechanism 10 includes a conveyor belt and a conveyor tray. The cleaning station and the inspection station are both located on the conveyor belt. The conveyor belt is used to carry the conveyor tray, and the conveyor tray is used to carry the light guide plate 40. A transmission rack is provided on both sides of the conveyor tray, and a rotatable transmission gear is provided on both sides of the cleaning gap. The transmission gear is connected to the first rotating shaft 22. When the conveyor tray is conveyed to the cleaning gap, the transmission rack and the transmission gear engage, so that the transmission gear rotates with the conveyor tray and drives the first rotating shaft 22 to rotate.

[0029] Specifically, the conveyor tray includes a base plate, and a first side plate, a second side plate, and a third side plate connected to the base plate. The light guide plate 40 includes a reflective surface disposed opposite to the light emitting surface. When the light guide plate 40 is placed on the conveyor tray, the reflective surface is opposite to the base plate, and the three non-light-incident sides of the light guide plate 40, excluding the light-incident side, are opposite to the first side plate, the second side plate, and the third side plate, respectively. The thickness of the first side plate, the second side plate, and the third side plate is less than the thickness of the light guide plate 40.

[0030] Understandably, when the conveyor tray moves to the cleaning gap area, the drive racks on both sides precisely engage with the drive gears pre-set on both sides of the cleaning gap. Because the drive racks and gears are engaged, the linear motion of the conveyor tray forces the drive gears to rotate, which in turn drives the first rotating shaft 22 to rotate. The rotation of the first rotating shaft 22, on the one hand, delivers the fresh section of the adhesive roll 221 to the cleaning gap, and on the other hand, causes the adhesive paper to roll and adhere to the light-emitting surface of the light guide plate 40 below, making adhesion and cleaning. When the conveyor tray has passed through the cleaning gap, its drive racks and gears disengage, the drive gears and the first rotating shaft 22 stop rotating, the cleaning action ends, and the conveyor tray, carrying the cleaned light guide plate 40, continues to be transported to the downstream inspection station.

[0031] Furthermore, the first rotating shaft 22 drives the adhesive roll 221 to rotate in the same tangential direction at the cleaning gap as the light guide plate 40 is conveyed in the conveying mechanism 10. Thus, when the first rotating shaft 22 is driven to rotate, causing the adhesive roll 221 on its outer side to move, the instantaneous linear velocity direction of the adhesive at the contact point is consistent with the conveying direction of the light guide plate 40 passing below. This makes the relative motion between the adhesive surface of the adhesive and the light-emitting surface of the light guide plate 40 approach zero, allowing the adhesive layer to capture impurities with the most sufficient contact time and the most perpendicular force, avoiding the risk of scraping or pushing impurities away due to tangential sliding speed.

[0032] Specifically, when the conveyor tray carrying the light guide plate 40 enters the cleaning gap, its transmission rack drives the transmission gear and the first rotating shaft 22 to rotate. Within the cleaning gap, the light-emitting surface of the light guide plate 40 comes into contact with the adhesive surface of the adhesive roll 221. Since the two move in the same direction and at the same speed at the contact point, they exhibit a smooth forward rolling contact. Impurities are effectively captured under the adhesive force perpendicular to the contact surface and are rolled off the surface of the light guide plate 40 as the adhesive roll rotates. After the impurities are transferred, the adhesive roll 221 separates smoothly from the surface of the light guide plate 40 in the same direction, avoiding microscopic damage to the cleaned surface or the adhesive roll itself caused by reverse or lateral tearing.

[0033] In some embodiments, the adhesive assembly further includes: a movable plate 24, a first synchronous pulley 25, a second synchronous pulley 26, a third synchronous pulley 27, a synchronous belt 28, and a first elastic element 241 and a second elastic element 271; the mounting bracket 21 is provided with a first sliding groove 211 and a second sliding groove 212; the movable plate 24 is movably disposed along the first sliding groove 211, and the first rotating shaft 22 and the second rotating shaft 23 are rotatably connected to the movable plate 24, and the movable plate 24 can drive the first rotating shaft 22 and the second rotating shaft 23 to move closer to or away from the cleaning gap in a direction perpendicular to the light guide plate 40; the first synchronous pulley 25 is coaxially connected to the first rotating shaft 22, and the second synchronous pulley 26 is coaxially connected to the transmission gear, the first synchronous pulley 27, the second synchronous pulley 28, the first elastic element 241, and the second elastic element 271. Three synchronous pulleys 27 are movably disposed along the second slide groove 212, and a synchronous belt 28 is wound around the first synchronous pulley 25, the second synchronous pulley 26, and the third synchronous pulley 27; the third synchronous pulley 27 is movable in the second slide groove 212 in a direction perpendicular to the connecting line between the first synchronous pulley 25 and the second synchronous pulley 26; a first elastic member 241 is connected to the mounting bracket 21 and the movable plate 24, and the first elastic member 241 is used to provide elastic force to the movable plate 24 in the direction of the cleaning gap; a second elastic member 271 is connected to the mounting bracket 21 and the third synchronous pulley 27, and the second elastic member 271 is used to provide elastic force to the third synchronous pulley 27 away from the connecting line between the first synchronous pulley 25 and the second synchronous pulley 26.

[0034] Understandably, when the new adhesive roll 221 is inserted into the first rotating shaft 22, its thickness is at its maximum, the first elastic element 241 is under pressure, the movable plate 24 is in a relatively high position, the synchronous belt 28 is in a taut state, and the third synchronous pulley 27 is in an initial equilibrium position under the tension of the second elastic element 271. As the adhesive roll 221 is used continuously, its outer diameter gradually decreases. Under the continuous downward elastic force of the first elastic element 241, the movable plate 24 floats downward along the first sliding groove 211, driving the first rotating shaft 22 and the first synchronous pulley 25 to move downward, thereby compensating for the loss of consumable thickness and maintaining the contact pressure at the cleaning gap. During the downward movement of the first rotating shaft 22, the center distance between the first synchronous pulley 25 and the second synchronous pulley 26 shortens, causing the synchronous belt 28 to loosen. At this time, the second elastic element 271 pulls the third synchronous pulley 27 to move along the second slide groove 212 to effectively tighten the synchronous belt 28, thereby automatically and in real time eliminating the looseness caused by the change in center distance, restoring the tight state of the transmission, and ensuring the reliable transmission of power from the transmission gear to the first rotating shaft 22.

[0035] Optionally, both the first elastic element 241 and the second elastic element 271 are springs.

[0036] In some embodiments, the cleaning mechanism 20 further includes a pressure sensor and a control unit; the pressure sensor is disposed between the movable plate 24 and the mounting bracket 21, or on the force path of the first elastic member 241, for detecting the actual pressure applied by the first elastic member 241 to the movable plate 24; the control unit is electrically connected to the pressure sensor and the drive motor of the conveying mechanism 10; the control unit is used to receive the signal from the pressure sensor, and when the actual pressure exceeds a preset pressure threshold, control the conveying mechanism 10 to stop running and / or issue an alarm signal.

[0037] It should be explained that during the process of the light guide plate 40 entering the cleaning gap and starting cleaning, the reaction force on the movable plate 24 and the first elastic element 241 is detected in real time by the pressure sensor and converted into an electrical signal transmitted to the control unit. The logic circuit or program inside the control unit continuously compares the received real-time pressure signal with the preset safety pressure threshold stored therein. When an abnormality occurs that causes the cleaning pressure to rise abnormally and exceed the preset threshold, the control unit immediately issues a control command. The control command can, on the one hand, cause the drive motor of the conveying mechanism 10 to stop urgently, cut off the power source, and immediately stop the conveying tray and cleaning action to prevent the damage from spreading; on the other hand, it can activate the alarm to prompt the operator to check and intervene.

[0038] Optionally, the pressure sensor can be directly integrated into the first elastic element 241, such as a piezoelectric washer spring. Alternatively, the pressure sensor can be mounted on the force interface between the movable plate 24 and the mounting bracket 21, such as a miniature S-shaped tension / compression sensor.

[0039] Optionally, the control unit can be set with two or more pressure thresholds. For example, when the first pressure threshold is reached, only a warning is issued but the system does not stop, while an emergency stop is performed only when a higher second pressure threshold is reached, providing tolerance for certain acceptable normal pressure fluctuations and reducing unnecessary downtime.

[0040] Please see Figure 5 This invention provides a light guide plate testing method, applied to the aforementioned light guide plate testing device, comprising: S100. Place the light guide plate to be tested on the conveying tray and start the conveying mechanism; S200. During the conveying process, the transmission racks on both sides of the conveying tray mesh with the transmission gears set at the cleaning station, so that the linear conveying motion of the conveying tray is synchronously converted into the rotational motion of the first rotating shaft, so that the adhesive roll rotates tangentially in the same direction as the conveying direction at the cleaning gap, and performs forward rolling cleaning on the light-emitting surface of the light guide plate that passes through. S300: The cleaned light guide plate is then conveyed along the conveying mechanism to the testing station, where the testing organization performs optical performance testing.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A light guide plate testing device for detecting the optical performance of a light guide plate, the light guide plate comprising a light emitting surface and a light incident surface adjacent to the light emitting surface, characterized in that, The light guide plate detection device includes: The conveying mechanism for conveying the light guide plate has a cleaning station and an inspection station arranged sequentially along the direction in which it conveys the light guide plate; The cleaning mechanism is installed at the cleaning station. When the light guide plate passes through the cleaning station, its light-emitting surface faces the cleaning mechanism. The cleaning mechanism is used to perform a cleaning operation on the light-emitting surface. The testing mechanism set at the testing station includes a light source and a testing lens. When the light guide plate reaches the testing station, its light-emitting surface faces the testing lens and its light-incident surface faces the light source. The cleaning mechanism includes an adhesive component for contacting the light-emitting surface to transfer impurities adhering to the light-emitting surface to the adhesive component.

2. The light guide plate testing device according to claim 1, characterized in that, The adhesive assembly includes: a mounting frame, a first rotating shaft, and a second rotating shaft. Both the first rotating shaft and the second rotating shaft are rotatably connected to the mounting frame. The first rotating shaft is used to hold the adhesive roll paper, and the second rotating shaft is used to hold the take-up paper tube. The first rotating shaft is positioned above the cleaning station, and a cleaning gap is formed between the first rotating shaft and the conveying mechanism for the light guide plate to pass through; the second rotating shaft is positioned above the first rotating shaft; the adhesive paper released from the adhesive roll has its outer adhesive surface facing outward on the first rotating shaft and its outer adhesive surface facing inward on the second rotating shaft.

3. The light guide plate testing device according to claim 2, characterized in that, The adhesive assembly further includes a transmission component connected between the first rotating shaft and the second rotating shaft, wherein the first rotating shaft and the second rotating shaft rotate synchronously through the transmission component.

4. The light guide plate testing device according to claim 3, characterized in that, The transmission component includes a first gear connected to the first rotating shaft and a second gear connected to the second rotating shaft, wherein the first gear and the second gear mesh. Alternatively, the transmission component may include a first transmission wheel connected to the first rotating shaft and a second transmission wheel connected to the second rotating shaft, as well as a transmission belt connected to the first transmission wheel and the second transmission wheel.

5. The light guide plate testing device according to claim 2, characterized in that, The conveying mechanism includes a conveyor belt and a conveyor tray. The cleaning station and the inspection station are both located on the conveyor belt. The conveyor belt is used to carry the conveyor tray, and the conveyor tray is used to carry the light guide plate. The conveying tray is provided with a transmission rack on both sides, and a rotatable transmission gear is provided on both sides of the cleaning gap. The transmission gear is connected to the first rotating shaft. When the conveying tray is conveyed to the cleaning gap, the transmission rack and the transmission gear engage, so that the transmission gear rotates with the conveying tray and drives the first rotating shaft to rotate.

6. The light guide plate testing device according to claim 5, characterized in that, The conveying tray includes: a base plate, and a first side plate, a second side plate, and a third side plate connected to the base plate; the light guide plate includes a reflective surface disposed opposite to the light emitting surface. When the light guide plate is placed on the conveying tray, the reflective surface is opposite to the base plate, and the three non-light-incident sides of the light guide plate, excluding the light-incident side, are opposite to the first side plate, the second side plate, and the third side plate, respectively. The thickness of the first side plate, the second side plate, and the third side plate is less than the thickness of the light guide plate.

7. The light guide plate testing device according to claim 5, characterized in that, The first rotating shaft drives the adhesive roll paper to rotate in the cleaning gap in the same direction as the light guide plate in the conveying mechanism.

8. The light guide plate testing device according to claim 5, characterized in that, The adhesive assembly further includes: a movable plate, a first synchronous pulley, a second synchronous pulley, a third synchronous pulley, a synchronous belt, and a first elastic element and a second elastic element; the mounting bracket is provided with a first sliding groove and a second sliding groove; the movable plate is movably disposed along the first sliding groove, and the first rotating shaft and the second rotating shaft are rotatably connected to the movable plate, the movable plate being able to drive the first rotating shaft and the second rotating shaft to move closer to or away from the cleaning gap in a direction perpendicular to the light guide plate; the first synchronous pulley is coaxially connected to the first rotating shaft, the second synchronous pulley is coaxially connected to the transmission gear, the third synchronous pulley is movably disposed along the second sliding groove, and the synchronous belt is wound around the first synchronous pulley, the second synchronous pulley, and the third synchronous pulley; the third synchronous pulley is able to move in the second sliding groove in a direction perpendicular to the connecting line of the first synchronous pulley and the second synchronous pulley; the first elastic element is connected to the mounting bracket and the movable plate, and the first elastic element is used to provide elastic force to the movable plate toward the cleaning gap; the second elastic element is connected to the mounting bracket and the third synchronous pulley, and the second elastic element is used to provide elastic force to the third synchronous pulley away from the connecting line of the first synchronous pulley and the second synchronous pulley.

9. The light guide plate testing device according to claim 8, characterized in that, The cleaning mechanism also includes a pressure sensor and a control unit; the pressure sensor is disposed between the movable plate and the mounting bracket, or on the force path of the first elastic member, for detecting the actual pressure applied by the first elastic member to the movable plate; the control unit is electrically connected to the pressure sensor and the drive motor of the conveying mechanism; The control unit is used to receive the signal from the pressure sensor, and when the actual pressure exceeds a preset pressure threshold, control the conveying mechanism to stop operating and / or issue an alarm signal.

10. A method for testing a light guide plate, characterized in that, The light guide plate testing apparatus according to claim 5 includes: Place the light guide plate to be tested on the conveyor tray and start the conveyor mechanism; During the conveying process, the transmission racks on both sides of the conveying tray engage with the transmission gears set at the cleaning station, so that the linear conveying motion of the conveying tray is synchronously converted into the rotational motion of the first rotating shaft, so that the adhesive roll rotates tangentially in the same direction as the conveying direction at the cleaning gap, and performs forward rolling cleaning on the light-emitting surface of the light guide plate that passes through. The cleaned light guide plate is then conveyed along the conveyor mechanism to the testing station, where the testing organization performs optical performance testing.

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