Light homogenizing plate detection system

Abstract

The utility model discloses a dodging plate detection system. The dodging plate detection system comprises a light source, a test plate, a camera and a processor, the test plate is placed between the light source and the camera, the processor is electrically connected with the camera, and the to-be-detected dodging plate is placed between the test plate and the camera; the test plate comprises a test pattern, and the camera is used for shooting the test pattern on one side, deviating from the test plate, of the to-be-detected light homogenizing plate to form a target image; the processor is used for determining the uniformity degree of the to-be-detected dodging plate according to the target image. The dodging plate detection system provided by the utility model is simple in structure, the detection station is easy to build, a specific light source is not needed during testing, the stroboflash of the light source does not need to be controlled, and the cost of the dodging plate detection system and the detection difficulty of the dodging plate can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of optical element detection, and in particular to a light-diffusing plate detection system. Background Technology

[0002] A light-diffusing plate is an optical element that uniformly scatters light from a light source. Its main function is to homogenize the light emitted from a point or line light source, preventing noticeable light spots, dark areas, and color differences, thereby achieving uniform illumination. Light-diffusing plates are widely used in various lighting, display, and testing fields. The uniformity of the light-diffusing plate affects its light scattering effect; therefore, it is necessary to test the light-diffusing capability of the plate. Currently, there is a lack of a simple yet highly accurate light-diffusing plate testing system. Utility Model Content

[0003] In view of this, the present invention provides a light-diffusing plate detection system, which has a simple structure and is easy to build.

[0004] The light-diffusing plate detection system provided in this embodiment includes: a light source, a test plate, a camera, and a processor; the test plate is placed between the light source and the camera, the processor is electrically connected to the camera, and the light-diffusing plate to be detected is placed between the test plate and the camera;

[0005] The test plate includes a test pattern, and a camera is used to capture the test pattern on the side of the light-diffusing plate opposite to the test plate to form a target image;

[0006] The processor is used to determine the uniformity of the light-diffusing plate to be detected based on the target image.

[0007] Optionally, the light homogenizer to be tested covers at least part of the test pattern along the optical axis of the light homogenizer detection system.

[0008] The length of the light-diffusing plate to be tested in the first direction is greater than the length of the test plate in the first direction; the first direction is parallel to the extension direction of the plane on which the light-diffusing plate to be tested is located;

[0009] The light homogenizing plate detection system also includes a moving component, on which the light homogenizing plate to be detected is placed, and the moving component is used to drive the light homogenizing plate to be detected to move along a first direction.

[0010] Optionally, the movable component includes a movable shelf on which the light-diffusing plate to be tested is placed.

[0011] Optionally, the moving component may further include a drive unit, which is connected to the movable shelf in a transmission manner, and the drive unit is used to drive the movable shelf to move in a first direction.

[0012] Optionally, the distance between the test plate and the light-diffusing plate to be tested is d1, where 2mm≤d1≤5mm.

[0013] Optionally, the distance between the light source and the test board is d2, where 0mm≤d2≤5mm.

[0014] Optionally, the light-diffusing plate to be tested includes a first surface and a second surface disposed opposite to each other along the thickness direction of the light-diffusing plate to be tested, with the first surface facing the test plate and the second surface facing the camera;

[0015] The first surface is smooth, and the second surface is frosted.

[0016] Optionally, the target image includes multiple feature patterns;

[0017] The processor includes a grayscale value determination module and a contrast calculation module. The grayscale value determination module is used to determine the grayscale values ​​of multiple feature graphics, and the contrast calculation module is used to calculate the contrast of the target image based on the grayscale values ​​of the multiple feature graphics. The contrast of the target image is used to characterize the uniformity of the light-diffusing plate to be detected.

[0018] Optionally, the test board includes a resolution test board.

[0019] Optionally, the light source is an area array light source, and / or the camera is an area array camera.

[0020] The uniform light distribution plate detection system provided by this utility model includes a light source, a test plate, a camera, and a processor. The test plate is placed between the light source and the camera, and the processor is electrically connected to the camera. The uniform light distribution plate to be detected is placed between the test plate and the camera. The test plate includes a test pattern. The camera is used to capture the test pattern on the side of the uniform light distribution plate to be detected away from the test plate, forming a target image. The processor is used to determine the uniformity of the uniform light distribution plate to be detected based on the target image. The above-mentioned uniform light distribution plate detection system has a simple structure, the detection station is easy to set up, and during testing, no specific light source is required, and there is no need to control the flicker of the light source, which can reduce the cost of the uniform light distribution plate detection system and the difficulty of uniform light distribution plate detection. Attached Figure Description

[0021] Figure 1 A schematic diagram of a light-diffusing plate detection system provided in an embodiment of this utility model;

[0022] Figure 2 A schematic diagram of the structure of a test board provided in an embodiment of this utility model;

[0023] Figure 3 A schematic diagram of a target image provided for an embodiment of this utility model;

[0024] Figure 4 A schematic diagram of another light-diffusing plate detection system provided in an embodiment of this utility model;

[0025] Figure 5A schematic diagram of the structure of a mobile component provided in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of a processor provided in an embodiment of the present utility model. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] The terminology used in the embodiments of this utility model is for the purpose of describing specific embodiments only and is not intended to limit the utility model. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this utility model are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when referring to an element being formed "upper" or "lower" of another element, it can be formed not only directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Solar energy is a renewable energy source, referring to the sun's thermal radiation. Solar-powered battery modules, such as monocrystalline silicon, polycrystalline silicon, and thin-film batteries, all require a cover glass. Common defects are inevitably generated during the production of photovoltaic glass substrates, such as bubbles, open bubbles, inclusions, unevenness, and roll marks. Scratches on the top and bottom surfaces may also occur during downstream production. To ensure the safety and performance requirements of photovoltaic glass, defect detection is necessary before shipment to prevent further losses.

[0030] When inspecting photovoltaic glass and other materials for defects, a light-diffusing plate is used. The uniformity of the light-diffusing plate (i.e., the degree of light uniformity) affects the detection effect. If the degree of light uniformity is too high, the bright field will encroach on the dark field; if the degree of light uniformity is too low, the bright field will not be uniform enough, thus affecting the detection effect.

[0031] The light-diffusing plate detection system provided in this embodiment of the invention can be applied to detect the uniformity of light-diffusing plates used in various fields, including photovoltaic glass defect detection, so as to ensure that the light-diffusing plate's light-diffusing capability matches the actual application requirements.

[0032] Figure 1 This is a schematic diagram of a light-diffusing plate detection system provided in an embodiment of the present invention, which can be referred to as follows. Figure 1 The light-diffusing plate detection system provided by this utility model includes: a light source 1, a test plate 2, a camera 3, and a processor 4; the test plate 2 is placed between the light source 1 and the camera 3, the processor 4 is electrically connected to the camera 3, and the light-diffusing plate 5 to be detected is placed between the test plate 2 and the camera 3; the test plate 2 includes a test pattern, the camera 3 is used to capture the test pattern on the side of the light-diffusing plate 5 to be detected away from the test plate 2 to form a target image; the processor 4 is used to determine the uniformity of the light-diffusing plate 5 to be detected based on the target image.

[0033] like Figure 1 As shown, the light homogenizer detection system may include a light source 1 and a test plate 2 and a camera 3 sequentially arranged on the light-emitting side of the light source 1. When detecting the light homogenizer 5 to be detected, the light homogenizer 5 to be detected can be placed between the test plate 2 and the camera 3. During detection, the light source 1, the test plate 2, the light homogenizer 5 to be detected, and the camera 3 are arranged sequentially along the optical axis of the test system. Figure 1 The diagram shows the optical components arranged vertically, but the actual arrangement is not limited to this.

[0034] The test plate 2 has a test pattern (not shown in the figure). The type of test pattern is not limited, and the test pattern may include multiple feature structures of any specific type. The light beam emitted from the light source 1 carries the test pattern information of the test plate 2 after passing through it. The light beam carrying the test pattern information is then received by the camera 3 via the light-diffusing plate 5. The camera 3 images the light beam carrying the test pattern information to form a target image. The target image is the image of the test pattern after being diffused by the light-diffusing plate 5. The imaging effect of the target image reflects the uniformity of the light-diffusing plate 5.

[0035] Further reference Figure 1 The processor 4 is electrically connected to the camera 3. The target image captured by the camera 3 is sent to the processor 4 for analysis and processing, thereby determining the uniformity of the light-diffusing plate 5 to be detected based on the target image.

[0036] The uniform light distribution plate detection system provided by this utility model includes a light source, a test plate, a camera, and a processor. The test plate is placed between the light source and the camera, and the processor is electrically connected to the camera. The uniform light distribution plate to be detected is placed between the test plate and the camera. The test plate includes a test pattern. The camera is used to capture the test pattern on the side of the uniform light distribution plate to be detected away from the test plate, forming a target image. The processor is used to determine the uniformity of the uniform light distribution plate to be detected based on the target image. The above-mentioned uniform light distribution plate detection system has a simple structure, the detection station is easy to set up, and during testing, no specific light source is required, and there is no need to control the flicker of the light source, which can reduce the cost of the uniform light distribution plate detection system and the difficulty of uniform light distribution plate detection.

[0037] Optionally, in a possible embodiment, the test board 2 described above includes a resolution test board.

[0038] A resolution test chart, also known as a resolution test chart or optical resolution test chart, is a tool used to evaluate and measure the resolution performance of display devices, optical systems, or image acquisition devices.

[0039] For example, Figure 2 This is a schematic diagram of the structure of a test board provided in an embodiment of the present invention. Figure 3 A schematic diagram of a target image provided for an embodiment of this utility model, such as... Figure 2 and Figure 3 As shown, in some embodiments, the test plate 2 can be a USAF test plate, which includes multiple sets of black line pairs. These multiple sets of black line pairs are the test patterns described above, and each line pair pattern is a feature structure. During testing, the light-diffusing plate 5 to be tested can be aligned with at least one set of line pairs, such that along the stacking direction of the test plate 2 and the light-diffusing plate 5 to be tested (i.e., the optical axis direction of the light-diffusing plate detection system), the light-diffusing plate 5 to be tested covers at least one set of line pairs. The camera 3 captures an image of at least one set of line pairs from one side of the light-diffusing plate 5 to be tested. Figure 3 The area outlined by the dashed line can be considered a target image.

[0040] Optionally, in possible embodiments, light source 1 is an area array light source, and / or, camera 3 is an area array camera.

[0041] Using an area array light source can achieve uniform lighting, ensuring the brightness of the image captured by camera 3. For example, Figure 1 As shown, along the optical axis of the uniform light plate detection system, the light source 1 can cover the test plate 2, so that the coverage area of ​​the light beam of the light source 1 is larger than the area of ​​the test plate 2, thereby ensuring the imaging quality of the camera 3.

[0042] Area array cameras can acquire high-precision images with higher resolution and faster sensitivity, capturing more details and more accurate colors, thereby improving the imaging quality of target images and ensuring the accuracy of detecting the uniformity of the light-diffusing plate.

[0043] Figure 4 This is a schematic diagram of another light-diffusing plate detection system provided in an embodiment of the present invention. Figure 4 The embodiments shown are refinements based on the above embodiments, and are referred to for further details. Figure 4In this embodiment, along the optical axis of the light homogenizing plate detection system, the light homogenizing plate 5 to be tested covers at least part of the test pattern; the length of the light homogenizing plate 5 to be tested in the first direction X is greater than the length of the test plate 2 in the first direction X; the first direction X is parallel to the extension direction of the plane where the light homogenizing plate 5 to be tested is located; the light homogenizing plate detection system also includes a moving component (not shown in the figure), the light homogenizing plate 5 to be tested is placed on the moving component, and the moving component is used to drive the light homogenizing plate 5 to be tested to move along the first direction X.

[0044] like Figure 4 As shown, under normal circumstances, the size of the test plate 2 is fixed, while the size of the light homogenizing plate 5 to be tested may be larger than that of the test plate 2. In this case, the light beam carrying the test pattern information may not be able to pass through all positions of the light homogenizing plate 5 to be tested. To ensure that the uniformity of different areas of the light homogenizing plate 5 to be tested can be detected, this embodiment limits the light homogenizing plate to be tested to be placed on a moving component (not shown in the figure), and the position of the light homogenizing plate 5 to be tested can be adjusted using the moving component.

[0045] For example, assuming the length of the light-diffusing plate 5 in the first direction X is greater than the length of the test plate 2 in the first direction X, when the light-diffusing plate 5 is placed on the side of the test plate 2 away from the light source 1, the two edges of the light-diffusing plate 5 along the first direction X will extend beyond the edge of the test plate 2. In this case, a certain area of ​​the light-diffusing plate 5 can be aligned with the test pattern, and the target image corresponding to that area can be captured. Then, a moving component can be used to move the light-diffusing plate 5 along the first direction X, thereby moving the undetected area of ​​the light-diffusing plate 5 to be aligned with the test pattern, and capturing the target image of that area. This process is repeated until target images of all areas of the light-diffusing plate 5 are acquired.

[0046] The first direction X can be any direction parallel to the plane of the light-diffusing plate 5 to be tested. Taking the test plate 2 and the light-diffusing plate 5 to be tested as both being rectangular, the first direction X can refer to any side length direction of the light-diffusing plate 5 to be tested. For example, when the length of the long side of the light-diffusing plate 5 to be tested is greater than the length of the long side of the test plate 2 and the length of the short side of the light-diffusing plate 5 to be tested is less than the length of the short side of the test plate 2, the first direction X is the direction of the long side of the light-diffusing plate 5 to be tested. When the length of the long side of the light-diffusing plate 5 to be tested is greater than the length of the long side of the test plate 2 and the length of the short side of the light-diffusing plate 5 to be tested is greater than the length of the short side of the test plate 2, the first direction X is both the direction of the long side and the direction of the short side of the light-diffusing plate 5 to be tested.

[0047] By setting a moving component to move the light-diffusing plate 5 to be tested, it is possible to ensure that target images are acquired in all areas of the light-diffusing plate 5 to be tested, thereby detecting the uniformity of any area of ​​the light-diffusing plate.

[0048] Figure 5This is a schematic diagram of the structure of a mobile component provided in an embodiment of the present invention, which can be referred to as follows. Figure 5 The movable component includes a movable shelf 6, on which the light-diffusing plate 5 to be tested is placed.

[0049] As an example, as an optional solution, the movable component includes a movable shelf 6, which may include a frame 61 and movable casters 62. The casters 62 are mounted under the legs of the frame 61, and the edge region of the light homogenizing plate 5 to be tested facing the test plate can be placed on the frame 61. By moving the movable shelf 6, the position of the light homogenizing plate 5 to be tested in the first direction X can be adjusted.

[0050] The specific structure of the frame 61 in the movable shelf 6 is not limited and can be set by those skilled in the art according to actual needs.

[0051] Optionally, in possible embodiments, the moving component may further include a driving component (not shown in the figure), which is connected to the movable shelf 6 in a transmission manner, and is used to drive the movable shelf 6 to move along a first direction X.

[0052] The driving component can be a drive motor or other components. By using the driving component to drive the movable shelf 6 to move, the position of the light-diffusing plate 5 to be tested can be automatically adjusted without the need for manual operation by the testing personnel, thereby reducing the workload of the testing personnel.

[0053] The specific connection between the drive component and the movable shelf 6 is not limited and can be configured by those skilled in the art according to actual needs. For example, the output shaft of the drive motor can be connected to the movable roller 62 for transmission, and the movement of the movable shelf 6 can be achieved by controlling the rotation of the drive motor.

[0054] The structure of the moving component described above is merely an example and is not limited to this. Any structure capable of moving the light-diffusing plate to be detected is within the scope of the technical solution protected by this utility model embodiment.

[0055] Optional, you can continue to refer to Figure 1 In a possible embodiment, the distance between the test plate 2 and the light-diffusing plate 5 to be tested is d1, where 2mm≤d1≤5mm.

[0056] In this embodiment, during testing, the light-diffusing plate 5 to be tested can be placed at a distance of 2 to 5 mm from the side of the test plate 2 away from the light source 1 to ensure the imaging effect of the test pattern on the side of the light-diffusing plate 5 to be tested.

[0057] For example, in some embodiments, d1 can be 3mm. Based on actual testing, setting the distance between the light-diffusing plate 5 to be tested and the test plate 2 to 3mm can ensure better imaging quality. In addition, a smaller distance between the test plate 2 and the light-diffusing plate 5 to be tested can also ensure that the overall size of the light-diffusing plate detection system is small, meeting the miniaturization requirements of the detection system.

[0058] Optional, you can continue to refer to Figure 1 In a possible embodiment, the distance between the light source 1 and the test plate 2 is d2, where 0mm ≤ d2 ≤ 5mm.

[0059] During testing, the test board 2 can be placed at a distance of 0-5mm from the light-emitting side of the light source 1 to ensure the lighting effect of the light source 1 on the test board 2.

[0060] Optionally, the distance between the light-diffusing plate 5 to be tested and the camera 3 is not limited. Those skilled in the art can set it according to actual needs to ensure that the camera 3 can be focused on the light-diffusing plate 5 to be tested.

[0061] Optional, you can continue to refer to Figure 1 The light-diffusing plate 5 to be tested includes a first surface 51 and a second surface 52 disposed opposite to each other along the thickness direction of the light-diffusing plate 5 to be tested. The first surface 51 faces the test plate 2 and the second surface 52 faces the camera 3. The first surface 51 is a smooth surface and the second surface 52 is a frosted surface.

[0062] Specifically, in some embodiments, the light-diffusing plate 5 to be tested can be a single-sided frosted plate, that is, one side surface of the light-diffusing plate 5 to be tested has a light-diffusing frosted structure. When testing the single-sided frosted plate, the frosted surface can face the camera 3, and the smooth surface can face the test plate 2. The target image acquired by the camera 3 is an image taken from the frosted surface, which helps to ensure the accuracy of uniformity detection.

[0063] Optional, Figure 6 This is a schematic diagram of the structure of a processor provided in an embodiment of the present utility model, which can be referred to in conjunction with reference to [reference needed]. Figure 2 , Figure 3 and Figure 5 The target image includes multiple feature patterns; the processor 4 includes a gray value determination module 41 and a contrast calculation module 42; the gray value determination module 41 is used to determine the gray values ​​of multiple feature patterns, and the contrast calculation module 42 is used to calculate the contrast of the target image based on the gray values ​​of multiple feature patterns. The contrast of the target image is used to characterize the uniformity of the light-diffusing plate 5 to be detected.

[0064] refer to Figure 2 and Figure 3Taking a test pattern consisting of multiple pairs of black lines as an example, the feature graphics are the line pair graphics, and the target image includes multiple line pair graphics from at least one set of line pairs. The grayscale value determination module 41 can read the grayscale values ​​of each line pair graphic according to the target image, and use software to fit a curve between the line pair position or line pair number and the grayscale value. The contrast calculation module 42 can calculate the contrast of the target image according to the contrast calculation formula.

[0065] The feature structures on test plate 2 are all the same color. Without the light-diffusing plate 5, the grayscale values ​​of each feature in the target image captured by camera 3 are the same. After passing through the light-diffusing plate 5, the grayscale values ​​of the feature shapes change. Therefore, the uniformity of the light-diffusing plate 5 can be determined based on the contrast of the target image. Generally, the higher the contrast of the target image, the lower the uniformity of the light-diffusing plate 5 and the worse the light-diffusing effect; conversely, the lower the contrast, the higher the uniformity of the light-diffusing plate 5 and the better the light-diffusing effect.

[0066] The formula for calculating contrast is: Contrast = (Maximum gray value - Minimum gray value) / (Maximum gray value + Minimum gray value).

[0067] For example, the processor also includes a light source adjustment module, which is used to adjust the light source brightness to a preset brightness before testing. By adjusting the light source brightness to the preset brightness for each test, the ambient brightness can be kept consistent for each test, and the grayscale values ​​of the target images captured each time are obtained under the same grayscale environment, thereby improving the accuracy of the uniformity detection of the light-diffusing plate.

[0068] The light-diffusing plate detection system provided in this embodiment may also include any components known to those skilled in the art, which will not be described in detail or limited in this embodiment.

[0069] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A light-diffusing plate detection system, characterized in that, include: The system includes a light source, a test board, a camera, and a processor; the test board is placed between the light source and the camera, the processor is electrically connected to the camera, and a light-diffusing plate to be tested is placed between the test board and the camera. The test board includes a test pattern, and the camera is used to capture the test pattern on the side of the light-diffusing plate to be tested away from the test board to form a target image; The processor is used to determine the uniformity of the light-diffusing plate to be detected based on the target image.

2. The light-diffusing plate detection system according to claim 1, characterized in that, Along the optical axis of the light homogenizing plate detection system, the light homogenizing plate to be tested covers at least a portion of the test pattern; The length of the light-diffusing plate to be tested in the first direction is greater than the length of the test plate in the first direction; the first direction is parallel to the extension direction of the plane on which the light-diffusing plate to be tested is located; The light-diffusing plate detection system further includes a moving component, on which the light-diffusing plate to be detected is placed, and the moving component is used to drive the light-diffusing plate to be detected to move along the first direction.

3. The light-diffusing plate detection system according to claim 2, characterized in that, The movable component includes a movable shelf, on which the light-diffusing plate to be tested is placed.

4. The light-diffusing plate detection system according to claim 3, characterized in that, The moving component further includes a driving component, which is connected to the movable shelf in a transmission manner, and is used to drive the movable shelf to move along the first direction.

5. The light-diffusing plate detection system according to claim 1, characterized in that, The distance between the test plate and the light-diffusing plate to be tested is d1, where 2mm≤d1≤5mm.

6. The light-diffusing plate detection system according to claim 1, characterized in that, The distance between the light source and the test board is d2, where 0mm≤d2≤5mm.

7. The light-diffusing plate detection system according to claim 1, characterized in that, The light-diffusing plate to be tested includes a first surface and a second surface that are disposed opposite to each other along the thickness direction of the light-diffusing plate to be tested, with the first surface facing the test plate and the second surface facing the camera; The first surface is a smooth surface, and the second surface is a frosted surface.

8. The light-diffusing plate detection system according to claim 1, characterized in that, The target image includes multiple feature patterns; The processor includes a grayscale value determination module and a contrast calculation module; the grayscale value determination module is used to determine the grayscale values ​​of multiple feature graphics, and the contrast calculation module is used to calculate the contrast of the target image based on the grayscale values ​​of the multiple feature graphics, and the contrast of the target image is used to characterize the uniformity of the light-diffusing plate to be detected.

9. The light-diffusing plate detection system according to claim 1, characterized in that, The test board includes a resolution test board.

10. The light-diffusing plate detection system according to claim 1, characterized in that, The light source is an area array light source, and / or the camera is an area array camera.

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