Transparent device detection system

Abstract

The present invention provides a light-transmitting device detection system, including a tray, a camera assembly and a light source assembly, wherein the tray includes a planar bearing surface, the bearing surface is used to bear the light-transmitting device, the light source assembly includes a first light source and a second light source, the first light source emits a vertical first light toward the bearing surface, the second light source emits an inclined second light toward the bearing surface, the first light and the second light are reflected on the light-transmitting device, the camera assembly receives the light reflected by the light-transmitting device to form an image, and detects defects of the light-transmitting device according to the image. By using the second light source as a compensation light source, the second light inclined to the light-transmitting device to be tested is increased, so that more diffuse reflection occurs in the light-transmitting device, so that the internal and surface defects of the light-transmitting device are revealed.

Description

Technical Field

[0001] The invention belongs to the field of optical imaging detection, and in particular relates to a light-transmitting device detection system. Background Art

[0002] With the development of society, the market for color filters is getting bigger and bigger. For example, mobile phone camera modules, digital cameras, LCD monitors, car systems, computer cameras, video phones and other color display appliances are inseparable from color filters. Therefore, it is becoming more and more important to control the quality of color filters.

[0003] At present, the method used by filter suppliers for factory inspection / the company for testing filters is: using a daylight source and a microscope with a magnification of X20 to observe the surface morphology of the filter under naked eye conditions.

[0004] If the existing method of inspecting optical filters is used, many internal structures and coating defects are difficult to determine. In addition, the above method cannot simultaneously inspect the front, back and interior of the optical filter. Summary of the invention

[0005] The purpose of the present invention is to provide a light-transmitting device detection system to solve the technical problems of the above-mentioned traditional light-transmitting device detection method.

[0006] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0007] The present invention provides a translucent device detection system, comprising a tray, a camera assembly and a light source assembly, wherein the tray comprises a planar bearing surface, the bearing surface is used to bear the translucent device, the light source assembly comprises a first light source and a second light source, the first light source emits a vertical first light ray toward the bearing surface, the second light source emits an inclined second light ray toward the bearing surface, the first light ray and the second light ray are reflected on the translucent device, the camera assembly receives the light reflected by the translucent device to form an image, and detects defects of the translucent device based on the image.

[0008] By using the second light source as a compensation light source and adding the second light inclined to the light-transmitting device to be tested, more diffuse reflection occurs in the light-transmitting device, making the internal and surface defects of the light-transmitting device visible.

[0009] Wherein, a coating layer is provided on the bearing surface, the bearing surface is made of silicon, and the coating layer is made of silicon nitride. By coating the bearing surface of the silicon material with a black silicon nitride film with strong light absorption ability, the light emitted by the light source component and passing through the light-transmitting device can be absorbed, reducing the interference of light reflection and scattering, and increasing the precision of detection.

[0010] Wherein, the bearing surface is provided with a plurality of protrusions, and the two ends of the light-transmitting device are respectively mounted on two adjacent protrusions, so that the light-transmitting device and the bearing surface have a first spacing distance. By providing a plurality of protrusions on the bearing surface, it is beneficial for the bearing surface to better absorb excess light. At the same time, the first spacing distance is set, and the bearing surface can perform secondary absorption (the light emitted by the light source component passes through the light-transmitting device but is not completely absorbed by the bearing surface, and the remaining light will be reflected to the light-transmitting device and then reflected back again).

[0011] The protrusion is in a "convex" shape to form a step structure, and the light-transmitting device is arranged on the step structure. By placing the light-transmitting device on the step structure in the middle of the protrusion, the interference of the external light source is reduced, so as to reduce the detection error.

[0012] The first spacing distance is 0.1-1 mm. The first spacing distance between the light-transmitting device and the bearing surface is reasonably set to enhance the light absorption capacity of the bearing surface, eliminate the interference of external light, and reduce the detection error.

[0013] The first light source and the second light source are both annular, the second light source encloses a first space, the first space is used to accommodate the first light source, the first light source encloses a second space, and the camera assembly captures the image of the light-transmitting device through the second space. The structures of the first light source and the second light source are reasonably set so that the light intensity of the first light and the second light can be effectively superimposed, so that the range and intensity of the light reaching the light-transmitting device meet the detection requirements.

[0014] The first light source includes three light emitting parts, red, green and blue, which are used to adjust the color of the light emitted by the first light source. By arranging the three light emitting parts on the first light source, pixel defects of the light-transmitting device under different colors can be detected.

[0015] The second light intersects with the first light, and the second light is inclined at an angle of 30 to 85° relative to the bearing surface. Reasonable setting of the inclination angle can better provide diffuse reflection on the surface of the light-transmitting device.

[0016] The distance between the first light source and the bearing surface is the second spacing distance, and the second spacing distance is 50-150 mm. The second spacing distance between the first light source and the bearing surface is reasonably set to reduce the energy loss of the first light while allowing the first light source to have a larger irradiation range.

[0017] The camera assembly includes a microscope and a camera, the optical axis of the microscope is perpendicular to the bearing surface, and the camera is arranged at the eyepiece of the microscope. By using the microscope and the camera together, defects can be magnified and converted into images, so as to facilitate the inspection work of the staff, reduce errors and increase the precision of the inspection.

[0018] The light-transmitting device detection system further includes a display and a control device, wherein the display is electrically connected to the camera assembly and is used to display the image captured by the camera assembly, and the control device is used to control the light source assembly and / or the camera assembly to move relative to the tray. Setting up a display and displaying the detected image therein is conducive to systematic detection and increases detection efficiency; setting up a control device can adjust the distance from the light source assembly and the camera assembly to the bearing surface under different conditions (different external light conditions, different materials and sizes of light-transmitting devices, etc.), thereby enhancing the adaptability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a light-transmitting device detection system in an embodiment;

[0021] Figure 2 is a front view of a tray in one embodiment;

[0022] Figure 3 A top view of a tray in one embodiment;

[0023] Figure 4 A diagram showing the position relationship between a tray and a light-transmitting device in an embodiment;

[0024] Figure 5 A schematic diagram of a part of the structure of a light-transmitting device detection system in an embodiment;

[0025] Figure 6a is a schematic structural diagram of a first light source in an embodiment;

[0026] Figure 6b is a schematic structural diagram of a second first light source in an embodiment;

[0027] Figure 7 FIG. 4 is a schematic diagram of the operation of a light source assembly in an embodiment. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 The embodiment of the present invention provides a light-transmitting device detection system 1000, which can detect defects on the front, back and inside of a light-transmitting device 11. The light-transmitting device 11 is, for example, a device that can be applied to a screen, such as a color filter, a touch screen module, a glass cover plate, etc., or an optical element such as a lens.

[0030] The light-transmitting device detection system 1000 comprises a tray 1, a camera assembly 3 and a light source assembly 2. The light source assembly 2 provides light required for detection, the camera assembly 3 collects image information of the light-transmitting device 11, and the tray 1 provides a space for placing the light-transmitting device 11.

[0031] The tray 1 includes a planar bearing surface 10, and the bearing surface 10 is used to bear a light-transmitting device 11. The tray 1 is arranged in the irradiation direction of the light of the light source assembly 2, so that the light source assembly 2 can project light to the bearing surface 10 of the tray 1, and the camera assembly 3 can receive the light reflected back by the light-transmitting device 11.

[0032] The light source assembly 2 includes a first light source 21 and a second light source 22. The first light source 21 provides a first light perpendicular to the carrying surface 10, and the second light source 22 provides a second light inclined to the carrying surface 10. Both the first light and the second light can be projected onto the light-transmitting device 11 and reflect. The camera assembly 3 receives the reflected light to form an image, and the defects of the light-transmitting device 11 can be detected by analyzing the image.

[0033] Since the first light emitted by the first light source 21 is perpendicular to the bearing surface 10, it is not easy to generate sufficient diffuse reflection on the light-transmitting device 11, while the second light emitted by the second light source 22, which is inclined to the bearing surface 10, can generate a large amount of diffuse reflection on the light-transmitting device 11. By using the second light source 22 in conjunction with the first light source 21, more diffuse reflection occurs on the light-transmitting device 11, and thus more light is reflected to the camera assembly 3 from tiny cracks on the surface of the light-transmitting device 11 or internal defects, making it easier to show internal and surface defects of the light-transmitting device 11 (similar to the surface scratches that are not clearly visible in daily life, which can be seen by aiming the light diagonally).

[0034] In one embodiment, see Figure 2 and Figure 3 The bearing surface 10 is provided with a coating layer 12, the bearing surface 10 is made of silicon, and the coating layer 12 is made of silicon nitride, preferably Si 3 N 4 As the material of the coating layer 12. In addition, coating is only a means of combining silicon nitride with the bearing surface 10. The bearing surface 10 is generally made of silicon nitride, or a separate silicon nitride sheet is placed on the bearing surface 10 to achieve this effect. By coating the black silicon nitride film with strong light absorption ability on the silicon bearing surface 10, the light emitted by the light source component 2 and passing through the light-transmitting device 11 can be absorbed, reducing the interference of light reflection and scattering, and increasing the precision of detection.

[0035] In one embodiment, please continue to refer to Figure 2 and Figure 3 , a plurality of protrusions 13 are provided on the bearing surface 10, and the two ends of the light-transmitting device 11 are respectively mounted on two adjacent protrusions 13, so that the light-transmitting device 11 and the bearing surface 10 have a first spacing distance 91. There are many ways to carry the light-transmitting device 11 on the protrusion 13. The light-transmitting device 11 can be built between the two waists of two adjacent triangles by setting a triangular protrusion 13, or a cylindrical protrusion 13 can be set to place the light-transmitting device 11 on the end face of the cylinder. Preferably, the protrusion 13 is set as a "convex"-shaped structure, and the light-transmitting device 11 is placed in the middle of the step structure. By setting a plurality of protrusions 13 on the bearing surface 10, it is beneficial for the bearing surface 10 to better absorb excess light. At the same time, the first spacing distance 91 is set, and the bearing surface 10 can perform secondary absorption (the light emitted by the light source assembly 2 passes through the light-transmitting device 11 but is not completely absorbed by the bearing surface 10, and the remaining light will be reflected to the light-transmitting device 11, and then reflected back again). Furthermore, placing the light-transmitting device 11 in the step structure in the middle of the “convex”-shaped protrusion 13 reduces interference from external light sources, thereby reducing detection errors.

[0036] In one embodiment, see Figure 4, the bearing surface 10 and the light-transmitting device 11 are parallel, and the first spacing distance 91 is set to 0.1-1 mm. Among them, the first spacing distance 91 is the length of the vertical line between the bearing surface 10 and the light-transmitting device 11. According to different detection conditions and different properties of the light-transmitting device 11, the first spacing distance 91 can be adjusted. When the thickness of the silicon nitride coating layer 12 of the bearing surface 10 is thin, the light absorption ability of the silicon nitride coating layer 12 is weak, and the first spacing distance 91 can be set to 0.7-1 mm, specifically 0.7 mm, 0.8 mm, 0.9 mm, 0.95 mm and 1 mm, etc., which is beneficial for the silicon nitride coating layer 12 of the bearing surface 10 to absorb the light passing through the light-transmitting device 11 multiple times to achieve a better light absorption effect. When the thickness of the silicon nitride coating layer 12 of the bearing surface 10 is relatively thick, the silicon nitride coating layer 12 has a strong light absorption ability, and the first spacing distance 91 can be set to 0.1mm~0.4mm, specifically 0.1mm, 0.2mm, 0.3mm or 0.4mm, to save space on the tray 1, which is beneficial to the layout of the assembly line detection. When the thickness of the silicon nitride coating layer 12 of the bearing surface 10 is average, the first spacing distance 91 is set to 0.4~0.7mm, specifically 0.44mm, 0.55mm, 0.66mm, etc., to achieve the purpose of saving space while achieving good light absorption effect. Reasonably set the first spacing distance 91 between the light-transmitting device 11 and the bearing surface 10 to enhance the light absorption ability of the bearing surface 10, while eliminating the interference of external light and reducing detection errors.

[0037] In one embodiment, see Figure 5 , the first light source 21 and the second light source 22 are arranged in a ring shape, which can be a circular ring, an elliptical ring or a square ring, preferably a circular ring, so that the light projection is uniform. Taking the circular ring as an example, the first light source 21 is arranged in the inner ring of the second light source 22. The camera assembly 3 is arranged on the inner ring of the first light source 21, away from the side of the tray 1, so that the camera assembly 3 can capture the image of the light-transmitting device 11 to be tested through the inner hole of the first light source 21. The structure of the first light source 21 and the second light source 22 is reasonably arranged so that the light intensity of the first light and the second light can be effectively superimposed, and the range and intensity of the light reaching the light-transmitting device 11 meet the detection requirements.

[0038] In one embodiment, please continue to refer to Figure 5 and Figure 6a, the first light source 21 includes three light-emitting parts, red, green and blue, and the three light-emitting parts are used to adjust the color of the light emitted by the first light source 21. The three light-emitting parts have different arrangements. When the arrangement is that multiple red light-emitting parts 211, green light-emitting parts 212 and blue light-emitting parts 213 are arranged in red, green and blue cycles, the three light-emitting parts can adjust a variety of colors. When the colors of the three light-emitting parts are adjusted to red, green and blue, respectively, and cycled in sequence, the color of the light received by the light-transmitting device 11 is white, which is equivalent to a daylight source. When only the red light-emitting part 211 of the three light-emitting parts is working, red light can be adjusted. Similarly, green and blue light can also be adjusted according to this principle. In addition to white and RGB (red, green and blue) colors, it can also be based on the principle of color synthesis. When the red light-emitting part 211 and the green light-emitting part 212 are working, the light color of the first light source 21 can be adjusted to a mixture of red and green, and the light obtained in the light-transmitting device 11 is yellow. In summary, according to this principle, other colors of light can also be obtained.

[0039] Also, see Figure 6b When the red, green and blue light-emitting units form a comprehensive light-emitting unit 210, and a plurality of the above-mentioned comprehensive light-emitting units 210 are arranged on the annular first light source 21, the above-mentioned color adjustment effect can also be achieved. By arranging the above-mentioned three light-emitting units on the first light source 21, the pixel defects of the light-transmitting device 11 under different colors can be detected. When the light-transmitting device 11 is a filter, since the filter can transmit red / green / blue light, the properties of the filter under different colors can be detected respectively.

[0040] In one embodiment, see Figure 7 , the second light intersects with the first light, and the second light is inclined at an angle of 30 to 85° relative to the bearing surface 10. The inclination angle can be adjusted according to the specific light source structure. The more the inclination angle 93 is less than 30°, the larger the space occupied by the second light source 22; the more the inclination angle 93 is greater than 85°, the lower the degree of diffuse reflection, and the less effective it is to detect subtle external defects or internal defects. Reasonable setting of the inclination angle can better provide diffuse reflection on the surface of the light-transmitting device 11.

[0041] In one embodiment, please continue to refer to Figure 7, the second spacing distance 92 between the first light source 21 and the bearing surface 10 is 50 to 150 mm, and the second spacing distance 92 is the distance perpendicular to the line segment between the first light source 21 and the bearing surface 10. When the second spacing distance 92 is less than 50 mm, the second spacing distance 92 between the first light source 21 and the bearing surface 10 is too short, which is not conducive to the superposition of the first light of the first light source 21 and the second light of the second light source 22, and the irradiation range of the first light source 21 is too small; when the second spacing distance 92 is higher than 150 mm, the second spacing distance 92 between the first light source 21 and the bearing surface 10 is too long, the first light is easy to disperse, and the intensity is reduced. Reasonably setting the second spacing distance 92 between the first light source 21 and the bearing surface 10 can reduce the energy loss of the first light while allowing the first light source 21 to have a larger irradiation range.

[0042] In one embodiment, see Figure 1 The camera assembly 3 includes a microscope 31 and a camera 32. The optical axis of the microscope 31 is perpendicular to the carrying surface 10, and the camera 32 is arranged on the eyepiece of the microscope 31. In addition, the camera assembly 3 can also be arranged beside the light source assembly 2, wherein the camera 32 is still arranged on the eyepiece of the microscope 31, and the optical axis of the microscope 31 is inclined to the carrying surface 10. This arrangement can also achieve the effect of observation. The camera 32 is used in a variety of devices, for example, it can be a video camera, a camera, etc. By using the microscope 31 and the camera 32 together, the defects are magnified and converted into the form of images, so that the staff can perform the inspection work, reduce errors, and increase the precision of the inspection.

[0043] In one embodiment, see Figure 1 , the light-transmitting device detection system 1000 also includes a display 4 and a control device 5. The display 4 is electrically connected to the camera assembly 3 and is used to display the image captured by the camera assembly 3. The control device 5 is used to control the movement of the light source assembly 2 and / or the camera assembly 3 relative to the tray 1. The display 4 can be a TV screen, a computer screen, or a projector and other devices that can display images. The control device 5 can be a computer, a PLC and other devices that can issue instructions to the camera assembly 3 and the light source assembly 2. Setting up the display 4 and displaying the detected image therein is conducive to systematic detection and increases the efficiency of detection; setting up the control device 5 can adjust the distance from the light source assembly 2 and the camera assembly 3 to the bearing surface 10 under different conditions (different external light conditions, different materials and sizes of the light-transmitting device 11, etc.), thereby enhancing the adaptability of the system.

[0044] In one embodiment, the detection method is as follows: the translucent device 11 to be tested is placed on the tray 1 designed by us, and the light source assembly 2 and the camera assembly 3 are controlled by the control device 5 to move to a suitable position so that the second spacing distance 92 is about 100 mm. Then the first light source 21 is adjusted to a red, green and blue cycle color (i.e., mixed into a white light source), and then the second light source 22 is turned on, and the light source intensity is adjusted to 1800-2000 Lux. Finally, fixed-focus shooting is performed, the focus of the camera is fixed on the inside of the translucent device 11, and a photo is taken to observe whether there are defects, and then the objective lens of the microscope 31 is moved up and down to confirm whether the translucent device 11 has missed defects. In this way, the surface information of the translucent device 11 can be collected, and the middle and lower surface information of the translucent device 11 can also be collected (the light passes through the translucent device 11, and with the background of the tray 1, not only the surface of the translucent device 11 can be seen, but also the internal uniformity of the translucent device 11 can be seen. The captured image can be exported to the display 4 to intuitively observe whether the translucent device 11 has defects.

[0045] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of implementing the above-mentioned embodiment and making equivalent changes according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A light-transmitting device detection system, characterized in that: The invention comprises a tray, a camera assembly and a light source assembly, wherein the tray comprises a planar bearing surface, the bearing surface is provided with a plurality of protrusions, the two ends of the light-transmitting device are respectively mounted on two adjacent protrusions so that the light-transmitting device and the bearing surface have a first spacing distance, the protrusions are in a "convex" shape to form a step structure, the light-transmitting device is arranged on the step structure, the light source assembly comprises a first light source and a second light source, the first light source emits a vertical first light ray toward the bearing surface, the second light source emits an inclined second light ray toward the bearing surface, the first light ray and the second light ray are reflected on the light-transmitting device, the camera assembly receives the light reflected by the light-transmitting device to form an image, and detects defects of the light-transmitting device according to the image.

2. The light-transmitting device detection system according to claim 1, characterized in that: A coating layer is disposed on the bearing surface. The bearing surface is made of silicon, and the coating layer is made of silicon nitride.

3. The light-transmitting device detection system according to claim 1, characterized in that: The first spacing distance is 0.1-1 mm.

4. The light-transmitting device detection system according to claim 1, characterized in that: The first light source and the second light source are both ring-shaped. The second light source encloses a first space. The first space is used to accommodate the first light source. The first light source encloses a second space. The camera assembly captures an image of the light-transmitting device through the second space.

5. The light-transmitting device detection system according to claim 4, characterized in that: The first light source includes three light emitting parts: red, green and blue. The three light emitting parts are used to adjust the color of the light emitted by the first light source.

6. The light-transmitting device detection system according to claim 4, characterized in that: The second light ray intersects with the first light ray, and the second light ray is inclined at an angle of 30 to 85 degrees relative to the bearing surface.

7. The light-transmitting device detection system according to claim 1, characterized in that: The distance between the first light source and the carrying surface is a second spacing distance, and the second spacing distance is 50-150 mm.

8. The light-transmitting device detection system according to claim 1, characterized in that: The camera assembly comprises a microscope and a camera, the optical axis of the microscope is perpendicular to the carrying surface, and the camera is arranged on the eyepiece of the microscope.

9. The light-transmitting device detection system according to claim 1, characterized in that: The light-transmitting device detection system also includes a display and a control device. The display is electrically connected to the camera assembly and is used to display the image captured by the camera assembly. The control device is used to control the movement of the light source assembly and / or the camera assembly relative to the tray.

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