Backlight source detection device with vacuum suction loading platform
By introducing limiting components and driving elements into the backlight testing equipment to automatically control the coverage of the thin film, the problem of easy damage to the thin film during the testing process is solved, and efficient automated testing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGGUAN XINHUATAI PHOTOELECTRIC TECH CO LTD
- Filing Date
- 2026-04-17
- Publication Date
- 2026-05-29
Smart Images
Figure CN122108535A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of backlight testing technology, and specifically discloses a backlight testing device with a vacuum adsorption stage. Background Technology
[0002] Backlights are widely used and can be categorized by size into consumer (mobile phones, tablets), industrial control, and laptop types. In mobile phones and laptops, due to the requirement for ultra-thin products, the vertical distance between the top of the backlight and the glass is designed to be small, resulting in a white spot on the top of the light-emitting surface when the module is pressed. Currently, the commonly used detection methods are finger-press testing and vacuum adsorption. The former has disadvantages such as unstable pressing pressure and inconsistent pressing position, while vacuum adsorption uses a thin film adsorption across the entire light-emitting surface, which has higher consistency and stability compared to finger-press testing.
[0003] For example, the patent with announcement number CN208026453U and announcement date of 2018-10-30 discloses a vacuum adsorption fixture for LED backlight products. The fixture includes: a base; multiple connecting rods fixedly mounted on the base; an adsorption device fixedly connected to the upper end of the connecting rods; the adsorption device includes an adsorption base plate; a backlight product placement plate fixedly connected to the adsorption base plate; a cover plate disposed on the backlight product placement plate; vacuum adsorption holes provided on the backlight product placement plate; sealing grooves provided around the adsorption base plate; silicone sealing strips provided in the sealing grooves; and circular through holes provided on the adsorption base plate.
[0004] The shortcomings of existing backlight detection devices, including the aforementioned patents, are that the film used to cover the backlight needs to be manually placed, adjusted, and removed each time the detection is carried out, which is inconvenient. At the same time, frequent manual operation, friction between the film and the backlight and fixture surfaces, as well as the pulling or folding that may be caused unintentionally by the operator, can easily cause fine scratches, wrinkles, or even tears on the film surface. Summary of the Invention
[0005] The purpose of this invention is to provide a backlight detection device with a vacuum adsorption stage.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A backlight testing device with a vacuum adsorption stage includes a worktable, a testing seat and an extrusion frame adapted to the testing seat on the worktable, a limiting component for limiting the position of the film on the extrusion frame, and a driving component for driving the extrusion frame to move up and down on the worktable. The extrusion frame is driven to move towards the testing seat so that the film covers the surface of the backlight to be tested.
[0008] The aforementioned backlight detection device includes a limiting frame movably mounted on an extrusion frame. The limiting frame has a limiting state that can press the film onto the extrusion frame, and a releasing state that is separated from the extrusion frame.
[0009] In the aforementioned backlight testing equipment, the four corners of the limiting frame are movably connected to the corresponding positions on the extrusion frame via connectors. The connectors include limiting rods fixed to the limiting frame, which pass through the extrusion frame and can slide vertically. A limiting spring is fitted on the limiting rod. When the limiting spring is in its natural state, the limiting frame is in a limited state.
[0010] The aforementioned backlight detection device includes a driving component comprising a vertically arranged first threaded rod and several first guide rods. Each first guide rod vertically penetrates the extrusion frame. The first threaded rod is threadedly connected to the extrusion frame, and the first threaded rod is driven to rotate to drive the extrusion frame to rise and fall.
[0011] The aforementioned backlight testing equipment has a visual inspection mechanism positioned directly above the testing seat on the worktable. The visual inspection mechanism includes an imaging component, a transmission component, and a processing component. The processing component determines the testing result based on the data from the imaging component.
[0012] The aforementioned backlight testing equipment has a winding mechanism on the extrusion frame. The winding mechanism includes an unwinding roller on one side of the extrusion frame and a take-up roller on the other side of the extrusion frame. The unwinding roller and the take-up roller are driven to rotate synchronously to replace the film located between the extrusion frame and the limiting frame.
[0013] The aforementioned backlight testing equipment also includes a clamping and traction assembly on the extrusion frame. The clamping and traction assembly is used to clamp the film, and when driven, it transports the end of the film from the side where the unwinding roller is located to the side where the take-up roller is located.
[0014] The aforementioned backlight testing equipment includes an upper clamping block, a lower clamping block, and a connecting member in its clamping and traction assembly. The upper and lower clamping plates are arranged in parallel and are parallel to the unwinding roller. The connecting member is driven to move the upper and lower clamping plates horizontally between the unwinding roller and the take-up roller. The lower clamping plate is driven to move closer to the upper clamping plate to clamp the film.
[0015] In the aforementioned backlight testing device, the upper clamping block has a semi-circular cross-section, and the lower clamping block has an arc-shaped cross-section. Limiting rings are fitted around the upper and lower clamping blocks. The lower clamping block is driven to move perpendicular to the opposing surfaces of the two. An elastic element is provided between the upper and lower clamping blocks to maintain their relative positions. The lower and upper clamping blocks are driven to rotate within the limiting rings so that the lower clamping block remains locked to the film.
[0016] The aforementioned backlight detection device has a limiting block below the extrusion frame. The limiting block has an arc-shaped surface that fits the outer wall of the upper clamping block. When the upper and lower clamping blocks are driven to move to correspond with the limiting block, the upper and lower clamping blocks are driven to rotate to release the clamping of the film, and the outer wall of the upper clamping block presses the film onto the limiting block.
[0017] In the above technical solution, the backlight detection device provided by the present invention restricts the film to the lower surface of the extrusion frame by setting a limiting component on the extrusion frame, and sets a driving component to drive the extrusion frame to rise and fall, thereby reducing manual operation to avoid human damage to the film and improving the utilization rate of the film. In addition, the automatic lifting of the extrusion frame also simplifies the operation process and improves the efficiency of backlight detection. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.
[0019] Figure 1 This is a schematic diagram of the backlight detection device provided in an embodiment of the present invention;
[0020] Figure 2 This is a front view of the backlight detection device provided in an embodiment of the present invention;
[0021] Figure 3 This is a partially enlarged schematic diagram of the backlight detection device provided in an embodiment of the present invention;
[0022] Figure 4 This is a schematic diagram showing the positional relationship between the extrusion frame and the detection seat provided in an embodiment of the present invention;
[0023] Figure 5 This is a front view of the extrusion frame provided in an embodiment of the present invention;
[0024] Figure 6 A bottom view of the extrusion frame provided in an embodiment of the present invention;
[0025] Figure 7 A top view of the extrusion frame provided in an embodiment of the present invention;
[0026] Figure 8 A cross-sectional view of the extrusion frame provided in an embodiment of the present invention;
[0027] Figure 9 Provided for embodiments of the present invention Figure 8 Enlarged view of point A in the middle;
[0028] Figure 10A cross-sectional view of the clamping and traction assembly installed on the extrusion frame according to an embodiment of the present invention;
[0029] Figure 11 Provided for embodiments of the present invention Figure 10 Enlarged view of point B in the middle;
[0030] Figure 12 This is a schematic diagram of the clamping and traction assembly provided in an embodiment of the present invention;
[0031] Figure 13 This is a top-down view of the explosion state of the detection seat provided in an embodiment of the present invention;
[0032] Figure 14 An elevation view of the explosion state of the detection seat provided in an embodiment of the present invention.
[0033] Explanation of reference numerals in the attached figures:
[0034] 1. Workbench; 11. First threaded rod; 12. First guide rod; 13. Top plate; 131. Imaging assembly; 2. Detection seat; 21. Placement slot; 22. Slot opening; 23. Air hole; 3. Extrusion frame; 31. Through slot; 32. Limiting block; 33. Second guide rod; 34. Second threaded rod; 4. Limiting assembly; 41. Limiting frame; 42. Limiting rod; 43. Limiting spring; 5. Winding mechanism; 51. Unwinding roller; 52. Rewinding roller; 53. Connecting block; 6. Clamping and traction assembly; 61. Upper clamping block; 611. Guide post; 612. Cylindrical cavity; 613. Reset spring; 62. Lower clamping block; 621. Guide hole; 622. Limiting post; 63. Connecting rod; 64. Adjusting block; 65. Limiting ring; 651. Limiting hole; 66. Pressure block. Detailed Implementation
[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0036] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0037] like Figures 1 to 14 As shown in the figure, an embodiment of the present invention provides a backlight testing device with a vacuum adsorption stage, including a worktable 1, a testing seat 2 and an extrusion frame 3 adapted to the testing seat 2 on the worktable 1, a limiting component 4 for limiting the position of the film on the extrusion frame 3, and a driving component for driving the extrusion frame 3 to rise and fall on the worktable 1. The extrusion frame 3 is driven to move towards the testing seat 2 so that the film covers the surface of the backlight to be tested.
[0038] Specifically, such as Figure 1 and Figure 2 As shown, the workbench 1 has a work platform, and the testing seat 2 is installed on the work platform. The testing seat 2 is rectangular, and its upper part has a placement groove 21 adapted to the size of the backlight to be tested. Air holes 23 are opened around the perimeter of the testing seat 2, both inside and outside the placement groove 21. A chamber is opened inside the testing seat 2, and each air hole 23 is connected to the chamber. The chamber is connected to a vacuum pump through a pipe. Preferably, the vacuum pump is connected to the chamber through at least four pipes, with the four pipes corresponding to the four corners of the chamber, to ensure that when the vacuum pump is started, air can be drawn from multiple points, ensuring that the gas in the chamber can be uniformly extracted, thereby making the film uniform. The film covers the surface of the backlight to be tested. A pressure regulating valve and a vacuum gauge are connected to the vacuum pump to achieve precise pressure adjustment. The vacuum pump, pipes, pressure regulating valve, and vacuum gauge are not shown in the diagram. The connection methods of the pipes and vacuum pump are existing technologies and can be directly applied without further explanation. The extrusion frame 3 is positioned above the detection seat 2 and is vertically aligned with it. Similarly, the extrusion frame 3 is rectangular. A limiting component 4 is provided on the side of the extrusion frame 3 facing the detection seat 2. That is, the limiting component 4 is positioned between the extrusion frame 3 and the detection seat 2. The limiting component 4 is used to press the edge of the film onto the surface of the extrusion frame 3 facing the detection seat 2. Figure 2 and Figure 4 Regarding the lower surface in the view, it should be noted that the limiting component 4 is located around the rectangular groove to avoid obstructing the backlight and ensure that the backlight can be fully exposed for comprehensive detection. Optionally, the limiting component 4 is a rectangular frame, and the detection seat 2 has a square slot 22 adapted to the rectangular frame to ensure that the film can directly contact the surface of the backlight to be tested when the extrusion frame 3 contacts the detection seat 2. In this embodiment, the rectangular frame and the extrusion frame 3 are detachably connected to facilitate the placement and limiting of the film. In addition, the worktable 1 is also provided with a driving component for driving the extrusion frame 3 to rise and fall. It is used to drive the extrusion frame 3 to rise vertically away from the detection seat 2 or to drive the extrusion frame 3 to fall vertically to contact the detection seat 2. Optionally, the driving component is an existing linear drive mechanism. Using a linear drive mechanism to drive a plate to rise and fall vertically is existing technology and can be directly applied without further explanation.
[0039] During operation, first, the extrusion frame 3 is moved upward to its maximum distance from the detection seat 2. Then, the rectangular frame is removed from the extrusion frame 3. After placing the film on the lower surface of the extrusion frame 3 and adjusting its position, the rectangular frame is then installed back onto the lower surface of the extrusion frame 3, pressing the film onto the lower surface of the extrusion frame 3 from bottom to top. The backlight to be tested is placed into the rectangular groove on the detection seat 2, and the extrusion frame 3 is moved downward to contact the detection seat 2. At this time, the film covers the surface of the backlight to be tested. The vacuum pump is started to extract the gas in the rectangular groove. During this process, the film adheres tightly to the surface of the backlight, and the test can begin.
[0040] The backlight detection device provided in this embodiment of the invention restricts the film to the lower surface of the extrusion frame 3 by setting a limiting component 4 on the extrusion frame 3, and setting a driving component to drive the extrusion frame 3 to rise and fall, thereby reducing manual operation to avoid human damage to the film and improving the utilization rate of the film. In addition, the automatic lifting and lowering of the extrusion frame 3 also simplifies the operation process and improves the efficiency of backlight detection.
[0041] Furthermore, the limiting component 4 includes a limiting frame 41 movably mounted on the extrusion frame 3. The limiting frame 41 has a limiting state that can press the film onto the extrusion frame 3, and a releasing state that is separated from the extrusion frame 3.
[0042] Optionally, the four corners of the limiting frame 41 are movably connected to the corresponding positions on the extrusion frame 3 via connectors. The connectors include limiting rods 42 fixed to the limiting frame 41. The limiting rods 42 pass through the extrusion frame 3 and can slide vertically. A limiting spring 43 is fitted on the limiting rods 42. When the limiting spring 43 is in its natural state, the limiting frame 41 is in a limited state.
[0043] Specifically, the limiting component 4 includes a limiting frame 41, which is the aforementioned rectangular frame. The limiting frame 41 is positioned between the extrusion frame 3 and the detection seat 2, and connectors are provided at each of the four corners of the limiting frame 41. The limiting frame 41 is connected to the extrusion frame 3 through these connectors. Figures 3 to 8 As shown, the connector includes a limiting rod 42 fixed to the limiting frame 41, and the limiting rod 42 is fixed to the surface of the limiting frame 41 facing the extrusion frame 3. Figure 4 In the view, the upper surface of the limiting rod 42 extends through the extrusion frame 3. A limiting spring 43 is fitted onto the portion of the limiting rod 42 above the extrusion frame 3. An annular protrusion is formed along the circumference of the upper end of the limiting rod 42. The limiting spring 43 is confined between this annular protrusion and the extrusion frame 3. When the limiting spring 43 is in its natural state, the limiting frame 41 presses the film against the lower surface of the extrusion frame 3 from bottom to top, thus confining the film. When the limiting spring 43 is in a compressed state (e.g., ...), ... Figure 4 As shown in the figure, the distance between the limiting frame 41 and the extrusion frame 3 is greater than the thickness of the film, that is, the film is in an unlimited state at this time, which makes it easy to replace the film.
[0044] When the film needs to be replaced, the extrusion frame 3 is driven upward by the aforementioned driving component. The extrusion frame 3, through the connecting component, drives the limiting frame 41 to move upward synchronously until the distance between the extrusion frame 3 and the detection seat 2 is at its maximum, leaving sufficient space for film replacement. Then, the limiting frame 41 is driven downward. The limiting frame 41 can be driven manually or by a linear drive mechanism such as an electric push rod; this is existing technology and can be directly applied. Next, the film is placed between the extrusion frame 3 and the limiting frame 41. After adjusting the position, the limiting frame 41 is driven upward from... The film is pressed from bottom to top onto the lower surface of the extrusion frame 3; then the backlight to be tested is placed into the rectangular groove set on the testing seat 2, and the extrusion frame 3 is driven down to contact the testing seat 2. At this time, the limiting frame 41 falls into the slot 22 opened on the testing seat 2. To ensure the sealing of the mating position between the limiting frame 41 and the slot 22, a rubber gasket can be set on the limiting frame 41 for sealing. The vacuum pump is started to extract the gas in the space where the backlight is located. As the gas is extracted, the film is tightly attached to the surface of the backlight. After the vacuum is completed, the power supply of the backlight is turned on, and the test can be performed.
[0045] In this embodiment, the limiting frame 41 and the extrusion frame 3 are detachably connected, so the film can be replaced without disassembling the limiting frame 41. The operation is simple. In addition, the limiting spring 43 ensures that the limiting frame 41 always has a certain clamping force on the film, ensuring that the film is always in a fully unfolded state. When the film is undamaged, it can be directly reused without adjusting its position.
[0046] In another embodiment of the present invention, the driving component includes a vertically arranged first threaded rod 11 and a plurality of first guide rods 12, each of the first guide rods 12 vertically penetrating the extrusion frame 3, the first threaded rod 11 being threadedly connected to the extrusion frame 3, and the first threaded rod 11 being driven to rotate to drive the extrusion frame 3 to rise and fall.
[0047] Specifically, the first guide rod 12 is provided in three sets, such as... Figures 1 to 4 As shown, the first threaded rod 11 and three sets of first guide rods 12 are respectively located at the four corners of the extrusion frame 3. The lower end of each first guide rod 12 is fixed to the surface of the worktable 1 (or the upper surface of the detection seat 2), while the upper end of the first guide rods 12 is connected to a top plate 13. The top plate 13 is located directly above the detection seat 2, and the extrusion frame 3 is located between the top plate 13 and the detection seat 2. The lower end of the first threaded rod 11 is rotatably connected to the worktable 1 (or the detection seat 2), while the first threaded rod... The upper end of rod 11 is rotatably connected to top plate 13. A motor (not shown in the figure) for driving the first threaded rod 11 to rotate is also provided on the worktable 1. The motor is mounted on the worktable 1, and its output end is connected to the lower end of the first threaded rod 11. With this configuration, when the motor drives the first threaded rod 11 to rotate, the three sets of first guide rods 12 limit and guide the extrusion frame 3, allowing the first threaded rod 11 to drive the extrusion frame 3 to move upward or downward. Preferably, the upper end of the limiting rod 42 extends upward, such as... Figures 2 to 5 As shown, during the process of driving the extrusion frame 3 upward by the first threaded rod 11, when the upper end of the limiting rod 42 abuts against the top plate 13, it can push the limiting frame 41 away from the extrusion frame 3, thereby passively releasing the limiting of the film.
[0048] In another embodiment of the present invention, a visual inspection mechanism is provided on the workbench 1 directly above the inspection seat 2. The visual inspection mechanism includes an imaging component 131, a transmission component, and a processing component. The processing component determines the inspection result based on the data from the imaging component 131.
[0049] Specifically, the visual inspection mechanism is used to capture images of the backlight's illumination and determine whether the backlight's luminous effect is acceptable based on these images. It includes an imaging component 131, a transmission component, and a processing component. The imaging component 131 can be an existing camera (such as a CCD camera or an industrial CMOS camera). The camera is mounted on the lower surface of the top plate 13 to ensure it is directly facing the backlight's luminous surface. The transmission component is an existing data transmission line, and the processing component is a computer. All three are existing technologies and can be directly applied without further explanation. The camera in this embodiment can capture images of the backlight's illumination and transmit them to a computer for analysis via the transmission line, thereby achieving automated inspection and reducing labor costs.
[0050] In another embodiment of the present invention, a winding mechanism 5 is provided on the extrusion frame 3. The winding mechanism 5 includes an unwinding roller 51 disposed on one side of the extrusion frame 3 and a take-up roller 52 disposed on the other side of the extrusion frame 3. The unwinding roller 51 and the take-up roller 52 are driven to rotate synchronously to replace the film between the extrusion frame 3 and the limiting frame 41.
[0051] Specifically, in the above embodiment, the film is manually laid between the extrusion frame 3 and the limiting frame 41. However, since the film is laid from bottom to top, the operation is inconvenient and it is difficult to lay it flat. In this embodiment, the extrusion frame 3 is provided with a winding mechanism 5, which includes an unwinding roller 51 and a take-up roller 52. The unwinding roller 51 and the take-up roller 52 are respectively arranged on both sides of the extrusion frame 3. The film is wound on the unwinding roller 51. Connecting blocks 53 are provided on the lower surface of the extrusion frame 3 at positions corresponding to both ends of the unwinding roller 51 and the take-up roller 52. Figure 4 and Figure 5 As shown, both the unwinding roller 51 and the winding roller 52 are rotatably mounted on the extrusion frame 3 via the connecting block 53. Figure 5 On the lower surfaces of the left and right sides in the view, the unwinding roller 51 and the winding roller 52 are rotatably connected to their corresponding support blocks, and the unwinding roller 51 and the winding roller 52 are detachably connected to their corresponding support blocks to facilitate the replacement of the rolled film. This is existing technology and can be directly applied without further explanation.
[0052] During operation, after the unwinding roller 51 with the film wound on it is installed in place, the height of the extrusion frame 3 is adjusted to maximize the distance between it and the detection seat 2, and the limiting frame 41 is driven down to move away from the lower surface of the extrusion frame 3. Then, the end of the film is pulled through the space between the extrusion frame 3 and the limiting frame 41, and the end of the film is initially wound (wrapped 2 to 3 times to prevent the end of the film from detaching from the take-up roller 52) onto the take-up roller 52. This drives the unwinding roller 51 and the take-up roller 52 to rotate synchronously. The unwinding roller 51 and the take-up roller 52 can be driven by motors respectively, or they can be connected by a transmission belt and then one of them can be driven by a motor. This is existing technology and can be directly applied without further explanation. Then the extrusion frame is driven... 3. Moving downwards: After the upper end of the limiting rod 42 separates from the top plate 13, the limiting spring 43 returns to its natural state. At this time, the limiting frame 41 presses against the edge of the film pulled down by the limiting rod 42. The limiting frame 41 moves upwards to press the film onto the lower surface of the extrusion frame 3, and the above steps can be followed for testing. With this setting, if the film is damaged and cannot continue to be used, the limiting frame 41 can be released from its position on the film by driving the extrusion frame 3 upwards. Then, the unwinding roller 51 and the take-up roller 52 can be driven to rotate synchronously, which can automatically replace the film between the limiting frame 41 and the extrusion frame 3. Then, by driving the extrusion frame 3 downwards, the limiting frame 41 can re-limit the film. The operation is simple and does not easily damage the film, and the testing efficiency is improved.
[0053] In another embodiment of the present invention, the extrusion frame 3 is further provided with a clamping and traction component 6, which is used to clamp the film and is driven to transport the end of the film from the side where the unwinding roller 51 is located to the side where the winding roller 52 is located.
[0054] Furthermore, the clamping and traction assembly 6 includes an upper clamping block 61, a lower clamping block 62, and a connector. The upper and lower clamping plates are arranged in parallel and are both parallel to the unwinding roller 51. The connector is driven to move the upper and lower clamping plates horizontally between the unwinding roller 51 and the take-up roller 52. The lower clamping plate is driven to move closer to the upper clamping plate to achieve clamping of the film.
[0055] Specifically, in the above embodiment, in the initial stage of testing, the end of the film needs to be manually pulled and passed between the extrusion frame 3 and the limiting frame 41 and wound onto the take-up roller 52. During this process, the film is prone to wrinkles and thus becomes unusable. In this embodiment, the extrusion frame 3 is provided with a clamping and pulling assembly 6, which is used to clamp the end of the film and pull the film from the side where the unwinding roller 51 is located to the side where the take-up roller 52 is located. The clamping and pulling assembly 6 includes an upper clamping plate, a lower clamping plate, and a connector. The connector includes two sets of vertically arranged connecting rods 63. The two sets of connecting rods 63 are respectively arranged at both ends of the upper clamping plate, and both connecting rods 63 pass through the extrusion frame 3. The extrusion frame 3 is provided with a through groove 31 adapted to the connecting rod 63 along the horizontal direction. The through groove 31 is arranged perpendicular to the central axis of both the unwinding roller 51 and the take-up roller 52. An adjusting block 64 is fixedly connected to the upper end of the connecting rod 63. Figure 3 and Figure 7 As shown, a second guide rod 33 and a second threaded rod 34 are provided on the upper surface of the extrusion frame 3 parallel to the through groove 31. The second threaded rod 34 is rotatably mounted above the extrusion frame 3. The second guide rod 33 passes through a set of adjusting blocks 64, and the second threaded rod 34 passes through another set of adjusting blocks 64 and is threadedly connected to them. This allows the second threaded rod 34 to be driven to rotate, thereby driving its corresponding adjusting block 64 to move along the through groove 31. The upper clamping plate is fixed to the lower end of the connecting rod 63, while the lower clamping plate is driven to move towards the upper clamping plate in the vertical direction to achieve clamping. Optionally, the lower clamping plate is connected to the upper clamping plate by bolts.
[0056] When pulling the end of the film, first, the extrusion frame 3 is moved upward until the limiting frame 41 is pushed away from the extrusion frame 3 by the limiting rod 42. Then, the second threaded rod 34 is driven to rotate. When the second threaded rod 34 rotates, it drives its corresponding adjusting block 64 to slide along the through groove 31 toward the side where the unwinding roller 51 is located, thereby driving the upper clamping plate and the lower clamping plate to move synchronously. When the upper clamping plate and the lower clamping plate move to the position closest to the unwinding roller 51 (the connecting rod 63 slides along the through groove 31 to one end), the end of the film is laid flat between the upper clamping plate and the lower clamping plate, and the film is clamped by moving the lower clamping plate upward. Then, the second threaded rod 34 is driven to reverse. Rotate the upper and lower clamping plates until they move to the side where the take-up roller 52 is located. After releasing the clamping of the film, wind the end of the film onto the take-up roller 52. This will drive the unwinding roller 51 and the take-up roller 52 to rotate synchronously. The rotation of the take-up roller 52 ensures that the end of the film is tightly wound onto the take-up roller 52 and cannot come off. Finally, drive the limiting frame 41 to press the film onto the lower surface of the extrusion frame 3. Then, the above steps can be followed for testing. By clamping and pulling the film end with the upper and lower clamping plates, the film can pass smoothly between the extrusion frame 3 and the limiting frame 41, protecting the film from damage.
[0057] Furthermore, the upper clamping block 61 has a semi-circular cross-section, and the lower clamping block 62 has an arc-shaped cross-section. Limiting rings 65 are fitted around the upper clamping block 61 and the lower clamping block 62. The lower clamping block 62 is driven to move perpendicular to the opposing surfaces of the two. An elastic element is provided between the upper clamping block 61 and the lower clamping block 62 to maintain their relative positions. The lower clamping block 62 and the upper clamping block 61 are driven to rotate within the limiting rings 65 so that the lower clamping block 62 remains locked to the film.
[0058] Specifically, to facilitate quick locking of the position of the lower clamping block 62 after the film is clamped by the upper clamping block 61 and the lower clamping block 62, in this embodiment, as follows: Figure 9 , Figure 11 and Figure 12 As shown, the upper clamping block 61 is a semi-cylinder with a semi-circular cross-section, while the lower clamping block 62 has an arc-shaped cross-section (the arc of the lower clamping block 62's cross-section is smaller than the semi-circle, i.e., the lower clamping block 62's cross-section is a minor arc). The radii of the arc-shaped surfaces of the lower clamping block 62 and the upper clamping block 61 are equal. Furthermore, two sets of limiting rings 65 are fitted around the upper and lower clamping blocks 61 and 62, respectively fitted onto the ends of the rod formed by the upper and lower clamping blocks 61 and 62. Unlike the previous embodiment, in this embodiment, the lower end of the connecting rod 63 is not connected to the upper clamping block 61, but is fixedly connected to the outer wall of the limiting ring 65, allowing the upper and lower clamping blocks 61 and 62 to rotate around the central axis of the limiting ring 65. The lower clamping block 62 is driven to move perpendicular to the surfaces of the two (upper and lower clamping blocks 61 and 62) opposite each other. Figure 9 or Figure 11The vertical movement in the view shows that a guide post 611 is fixedly connected to the upper clamping block 61, as shown. Figure 11 As shown, the upper clamping block 61 has a cylindrical cavity 612 with a diameter larger than that of the guide post 611 at the position corresponding to the guide post 611. The guide post 611 is located inside the cylindrical cavity 612. The lower clamping block 62 has a guide hole 621 that matches the guide post 611. The end of the guide post 611 is always located in the guide hole 621. A return spring 613 is fitted outside the guide post 611. When the return spring 613 is in its natural state, the distance between the lower clamping block 62 and the upper clamping block 61 is at its maximum. Figure 11 As shown, at this time, the arc-shaped surface of the lower clamping block 62 is in contact with the inner wall of the limiting ring 65, and the guide post 611 is at its minimum length in the guide hole 621. Figure 11 In the indicated state, a limiting post 622 is fixedly connected to the outer wall of the lower clamping block 62. The limiting post 622 is arranged parallel to the guide post 611. The inner wall of the limiting ring 65 has a limiting hole 651 that matches the limiting post 622. When the return spring 613 is in its natural state, the limiting post 622 is in the limiting hole 651. At this time, the distance between the lower clamping block 62 and the upper clamping block 61 is the maximum, and the upper clamping block 61 and the lower clamping block 62 are restricted from rotating. However, when it is necessary to clamp the film... When pressing the film, place the end of the film flat between the upper clamping block 61 and the lower clamping block 62, and then press the lower clamping block 62 upward. For ease of operation, both ends of the upper clamping block 61 and the lower clamping block 62 are provided with pressure blocks 66, and the pressure blocks 66 at the same end of the upper clamping block 61 and the lower clamping block 62 are arranged in parallel to facilitate simultaneous force application from both ends of the upper clamping block 61 and the lower clamping block 62. During the process of pressing the lower clamping block 62 upward onto the upper clamping block 61, as the lower clamping block 62 presses the upper clamping block 61 upward... As the upper clamping block 612 approaches, the return spring 613 is compressed and deformed, storing force until the limiting post 622 is completely disengaged from the limiting hole 651. Then, the upper clamping block 61 and the lower clamping block 62 are rotated. When the limiting post 622 is misaligned with the limiting hole 651, it abuts against the inner wall of the limiting ring 65. The return spring 613 is unable to push the lower clamping block 62 away from the upper clamping block 61, ensuring that the lower clamping block 62 remains in contact with the upper clamping block 61, thus maintaining the clamping of the film. This configuration... By pressing the lower clamping block 62 against the side where the upper clamping block 61 is located and driving both to rotate synchronously, the upper clamping block 61 can be kept in a clamping state on the film. In specific implementation, when the film is wound around the outside of the take-up roller 52, the upper clamping block 61 and the lower clamping block 62 can be placed between the film and the extrusion frame 3. With this arrangement, during inspection, when it is necessary to drive the unwinding roller 51 and the take-up roller 52 to rotate to change the film, the upper clamping block 61 and the lower clamping block 62 are first driven along... Figure 4 After the horizontal movement in the view is to one side of the unwinding roller 51, both are driven to reset. The upper clamping block 61 and the lower clamping block 62 squeeze the film, promoting the separation of the film from the extrusion frame 3, thereby preventing the film from sticking to the extrusion frame 3. The winding roller 52 forcibly winds the film, causing it to be damaged and unusable.
[0059] In another embodiment of the present invention, a limiting block 32 is provided below the extrusion frame 3. The limiting block 32 has an arc-shaped surface that adapts to the outer wall of the upper clamping block 61. When the upper clamping block 61 and the lower clamping block 62 are driven to move to correspond to the limiting block 32, the upper clamping block 61 and the lower clamping block 62 are driven to rotate to release the clamping of the film, and the outer wall of the upper clamping block 61 presses the film onto the limiting block 32.
[0060] Specifically, in the above embodiment, the rotation of the upper clamping block 61 and the lower clamping block 62 (to release the clamping of the film) requires simultaneously pinching both ends of the upper clamping block 61 and the lower clamping block 62 for easier rotation. When the film is not clamped, the ends will naturally droop under gravity, easily causing wrinkles in the portion of the film between the extrusion frame 3 and the limiting frame 41, thus affecting its testing use. In this embodiment, a limiting block 32 is provided below the extrusion frame 3, such as... Figure 8 and Figure 9 As shown, the limiting block 32 is positioned below the extrusion block 66 corresponding to the take-up roller 52, and is parallel to the unwinding roller 51 and the take-up roller 52. The limiting block 32 has an inner arc surface that adapts to the outer wall of the upper clamping block 61. When the upper clamping block 61 and the lower clamping block 62 are driven to move to the position closest to the take-up roller 52, the upper clamping block 61 and the lower clamping block 62 are driven to rotate. Figure 8 (Rotating counterclockwise in the view) allows the film to be pressed against the inner arc surface of the limiting block 32 via the outer wall of the upper clamping block 61. It should be noted that the cooperation between the upper clamping block 61 and the limiting block 32 only provides initial positioning of the film to prevent it from sagging naturally under gravity; it does not prevent the winding roller 52 from rotating to wind up the film, thus avoiding excessive force and damage to the film. In this embodiment, the limiting hole 651 is symmetrically arranged about the horizontal plane containing the central axis of the limiting ring 65. Figure 11 As shown, so that the upper clamping block 61 and the lower clamping block 62 are in Figure 11 In the indicated state, the limiting post 622 can be inserted into the lower limiting hole 651, and after the upper clamping block 61 and the lower clamping block 62 rotate 180°, the limiting post 622 can be inserted into the upper limiting hole 651. It should be noted that since the upper clamping block 61 and the lower clamping block 62 are located between the film and the extrusion frame 3, in order for the limiting frame 41 to press the film smoothly onto the lower surface of the extrusion frame 3, a certain length needs to be reserved during the initial winding of the film onto the take-up roller 52 to prevent the film from being too tight and thus unable to be pressed onto the lower surface of the extrusion frame 3 by the limiting frame 41.
[0061] When the end of the film is pulled to the side of the take-up roller 52 according to the above steps, that is, when the upper clamping block 61 and the lower clamping block 62 can cooperate with the limiting block 32, pinch the upper clamping block 61 and the lower clamping block 62 and rotate (rotate counterclockwise in Figure 11), adjust the angle of the limiting post 622 until the limiting post 622 is inserted into the limiting hole 651 on the upper part of the limiting ring 65. At this time, the positions of the upper clamping block 61 and the lower clamping block 62 are interchanged, and the outer wall of the upper clamping block 61 presses the film on the limiting block 32. At the same time, because the limiting post 622 rotates to be directly opposite the limiting hole 651, the second spring in the stored state can push the lower clamping block 62 away from the upper clamping block 61, thereby releasing the clamping of the end of the film. In order to ensure that the end of the film can be initially wound on the take-up roller 52, a certain length can be reserved when clamping the film to facilitate the film winding onto the take-up roller 52.
[0062] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A backlight testing device with a vacuum adsorption stage, comprising a worktable, a testing seat and a compression frame adapted to the testing seat, characterized in that, The extrusion frame is equipped with a limiting component for restricting the position of the film, and the worktable is also equipped with a driving component for driving the extrusion frame to rise and fall. The extrusion frame is driven to move towards the detection seat so that the film covers the surface of the backlight to be inspected.
2. The backlight testing device with a vacuum adsorption stage according to claim 1, characterized in that, The limiting assembly includes a limiting frame movably mounted on the extrusion frame, the limiting frame having a limiting state capable of pressing the film onto the extrusion frame, and a releasing state capable of separating from the extrusion frame.
3. The backlight testing device with a vacuum adsorption stage according to claim 2, characterized in that, The four corners of the limiting frame are movably connected to the corresponding positions on the extrusion frame via connectors. The connectors include limiting rods fixed to the limiting frame. The limiting rods pass through the extrusion frame and can slide vertically. A limiting spring is fitted on the limiting rod. When the limiting spring is in its natural state, the limiting frame is in the limiting state.
4. The backlight testing device with a vacuum adsorption stage according to claim 1, characterized in that, The driving component includes a vertically arranged first threaded rod and several first guide rods. Each first guide rod vertically passes through the extrusion frame. The first threaded rod is threadedly connected to the extrusion frame, and the first threaded rod is driven to rotate to drive the extrusion frame to rise and fall.
5. The backlight testing device with a vacuum adsorption stage according to claim 1, characterized in that, A visual inspection mechanism is set directly above the inspection seat on the workbench. The visual inspection mechanism includes an imaging component, a transmission component, and a processing component. The processing component determines the inspection result based on the data from the imaging component.
6. The backlight testing device with a vacuum adsorption stage according to claim 2, characterized in that, The extrusion frame is equipped with a winding mechanism, which includes an unwinding roller on one side of the extrusion frame and a take-up roller on the other side of the extrusion frame. The unwinding roller and the take-up roller are driven to rotate synchronously to replace the film between the extrusion frame and the limiting frame.
7. A backlight testing device with a vacuum adsorption stage according to claim 6, characterized in that, The extrusion frame is also equipped with a clamping and traction assembly, which is used to clamp the film and is driven to transport the end of the film from the side where the unwinding roller is located to the side where the take-up roller is located.
8. A backlight testing device with a vacuum adsorption stage according to claim 7, characterized in that, The clamping and traction assembly includes an upper clamping block, a lower clamping block, and a connector. The upper and lower clamping plates are arranged in parallel and are parallel to the unwinding roller. The connector is driven to move the upper and lower clamping plates horizontally between the unwinding roller and the take-up roller. The lower clamping plate is driven to move closer to the upper clamping plate to clamp the film.
9. A backlight testing device with a vacuum adsorption stage according to claim 8, characterized in that, The upper clamping block has a semi-circular cross-section, and the lower clamping block has an arc-shaped cross-section. Limiting rings are fitted around the upper and lower clamping blocks. The lower clamping block is driven to move perpendicular to the opposing surfaces of the two. An elastic element is provided between the upper and lower clamping blocks to maintain their relative positions. The lower and upper clamping blocks are driven to rotate within the limiting rings so that the lower clamping block remains locked to the film.
10. A backlight testing device with a vacuum adsorption stage according to claim 8 or 9, characterized in that, A limiting block is provided below the extrusion frame. The limiting block has an arc-shaped surface that fits the outer wall of the upper clamping block. When the upper and lower clamping blocks are driven to move to correspond with the limiting block, the upper and lower clamping blocks are driven to rotate to release the clamping of the film, and the outer wall of the upper clamping block presses the film onto the limiting block.