Multi-point light source based prism internal imaging system
By using a multi-point light source prism internal imaging system, the problems of missed detection and false detection in traditional detection methods have been solved, achieving efficient and clear imaging of internal defects in the prism, thus improving detection accuracy and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING FOCUSIGHT TECH
- Filing Date
- 2023-12-22
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional inspection methods cannot effectively image internal defects of prisms, leading to missed and false detections. Furthermore, manual inspection is complex and prone to introducing secondary contamination.
A prism internal imaging system based on multiple point light sources is adopted, which uses multiple point light sources to enter the interior of the prism at a specific angle, and combines a high-precision telecentric lens and adjustment structure to achieve efficient imaging of the prism surface and interior.
It improves the accuracy and efficiency of detecting internal defects in prisms, reduces the false detection rate, increases product yield and production efficiency, and avoids secondary contamination from manual inspection.
Smart Images
Figure CN117761084B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of detection technology, and in particular to an imaging system based on a multi-point light source prism. Background Technology
[0002] In existing manufacturing processes, traditional manufacturers typically use area array cameras paired with ring light sources to perform internal inspections on mobile phone camera prism products.
[0003] The system mainly consists of an area array camera, a telecentric lens, and multiple ring light sources. Illumination is achieved through low-angle / high-angle modes using LED ring light sources. In low-angle mode, the light source illuminates the object at an angle close to 180 / 90 / 45 degrees. Multiple images easily highlight the edges and height changes of the object being inspected, thus enabling the detection of scratches on the edges of the object and on smooth surfaces.
[0004] Because the combination of area array and ring light used by traditional manufacturers cannot achieve a detectable contrast between the background and defects on the detection surface when imaging the inside of the prism, and because the prism body is small, most of the light from this light source cannot enter the inside of the prism. Currently, traditional manufacturers increase the grayscale value of the image by performing grayscale scaling. When this processing method amplifies the grayscale of all pixels, other non-defect interferences are also amplified, resulting in uncontrollable false detections.
[0005] Reference Figure 1 The prism includes surfaces A, B, C, and D. Surfaces E and F are located between surfaces A and C. Surfaces A and C are transparent, while the other four surfaces are coated with ink.
[0006] Due to the special structure of the prism, some directional scratches inside the prism require specific angles and directions to be imaged. The angle of the LED beads around the ring light is fixed, making it impossible to effectively image these defects, thus causing missed detections. Summary of the Invention
[0007] The technical problem to be solved by the present invention is: In order to solve the technical problems in the prior art, the present invention provides an internal imaging system based on a multi-point light source prism.
[0008] The technical solution adopted by the present invention to solve its technical problem is: a multi-point light source prism internal imaging system, including an area array camera, the shooting end of which is set facing the prism; a lens, which is set between the area array camera and the prism; and a point light source, which is tilted towards the prism and can be adjusted relative to the prism so that light enters the interior of the prism at a specific angle.
[0009] The present invention is a multi-point light source prism internal imaging system that uses external point light sources in multiple directions to illuminate the prism surface and interior at specific angles, so that sufficient light can enter the prism interior and image defects.
[0010] Furthermore, the point light source is provided in multiple locations surrounding the prism.
[0011] Furthermore, the angle at which the light emitted from the point light source enters the interior of the prism is 50-60 degrees.
[0012] Furthermore, the angle at which the light emitted from the point light source enters the interior of the prism is 55 degrees.
[0013] Furthermore, the lens employs a high-precision, large-field, deep-center lens to accommodate the elevation differences of the slope.
[0014] Furthermore, the multi-point light source prism internal imaging system includes a frame; a camera up-down adjustment plate, which is mounted on the frame and can move relative to the frame along the Z-axis; and a camera left-right adjustment plate, which is mounted on the camera up-down adjustment plate and can move relative to the camera up-down adjustment plate along the X-axis. The camera left-right adjustment plate is connected to the area array camera.
[0015] Furthermore, a front-rear adjustment plate is connected to the left-right adjustment plate of the camera. The front-rear adjustment plate of the camera can move relative to the left-right adjustment plate of the camera along the Y-axis. The front-rear adjustment plate of the camera is connected to the area array camera.
[0016] Furthermore, a differential platform is connected to the left and right adjustment plates of the camera, and the movable end of the differential platform is connected to the front and rear adjustment plates of the camera.
[0017] Furthermore, the frame is provided with a light source fixing plate, and a light source up-down adjustment plate is connected to the light source fixing plate. The light source up-down adjustment plate is connected to the point light source, and the light source up-down adjustment plate is adapted to move relative to the light source fixing plate along the Z-axis direction.
[0018] Furthermore, a light source angle adjustment plate is connected to the upper and lower adjustment plate of the light source. The light source angle adjustment plate is connected to the point light source, and the light source angle adjustment plate can rotate relative to the upper and lower adjustment plate of the light source to adjust the angle of the point light source.
[0019] The beneficial effects of this invention are:
[0020] 1. By using external point light sources at 55° angles in four directions to illuminate the surface and interior of the prism, sufficient light can enter the interior of the prism, revealing defects while avoiding light interference, resulting in clear imaging.
[0021] 2. Reduced Detection Difficulty: Traditional prism defect detection methods mainly rely on manual inspection using a high-powered microscope and ring light. This requires constant manual flipping and focusing on various internal inspection surfaces, making the process complex and subjective, and significantly increasing the difficulty of manual inspection. Using this technology, defect features can be clearly presented in the imaging system, enabling visual inspection and reducing the difficulty of detecting this defect.
[0022] 3. Improve product yield: Manual inspection requires the use of tweezers to flip the product, which can easily introduce foreign objects such as dust and lint, and cause bumps and knocks, thus creating new defects. This technology eliminates the need for flipping and does not introduce secondary pollution during production, thereby improving the overall process yield.
[0023] 4. Improve production efficiency: Manual inspection requires the use of microscopes and repeated observation from multiple angles, which places extremely high demands on workshop cleanliness, operator skill proficiency, and operator efficiency. Using this technology can achieve efficient detection of this defect, significantly improving production efficiency. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] Figure 1 This is a schematic diagram illustrating a prism in the background technology.
[0026] Figure 2 This is the optical path diagram of the imaging system hardware in this invention.
[0027] Figure 3 This is a schematic diagram illustrating the specific structure of the area array camera and point light source in this invention.
[0028] Figure 4 This is a schematic diagram illustrating the optical path principle for defect presentation in this invention.
[0029] Figure 5 This is a schematic diagram illustrating the reflective avoidance design principle in this invention.
[0030] Figure 6 This is the optical path diagram for defect imaging in this invention.
[0031] In the diagram: 1. Area scan camera; 2. Lens; 3. Point light source; 4. Camera up / down adjustment plate; 41. Camera left / right adjustment plate; 42. Differential platform; 43. Camera front / back adjustment plate; 44. Light source fixing plate; 45. Light source up / down adjustment plate; 46. Light source angle adjustment plate; 51. Surface A; 52. Surface B; 53. Surface C; 54. Surface D; 55. Surface E; 56. Surface F. Detailed Implementation
[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.
[0033] This invention discloses an internal imaging system based on a multi-point light source prism.
[0034] Reference Figures 1 to 4 An imaging system based on a multi-point light source 3-prism includes an area array camera 1, a lens 2, and point light sources 3. The shooting end of the area array camera 1 is set facing the prism. The lens 2 is located between the area array camera 1 and the prism and is connected to the area array camera 1. There are multiple point light sources 3, preferably four, which are arranged around the prism. The point light sources 3 are located between the prism and the telecentric lens 2 in order to provide sufficient light for the area array camera 1 to perform imaging.
[0035] The light emitted from point light source 3 enters the prism at an angle of 50-60 degrees, preferably 55 degrees. Lens 2 can be a high-precision, large-field, deep-center lens to accommodate the elevation differences of the slope.
[0036] Referring to the figure, the multi-point light source 3-prism internal imaging system also includes a frame. A camera up-down adjustment plate 4 is connected to the frame. The camera up-down adjustment plate 4 has a waist-shaped groove along the Z-axis, allowing it to move relative to the frame along the Z-axis to adjust its position, and can be fixed to the frame with bolts. A camera left-right adjustment plate 41 is connected to the camera up-down adjustment plate 4. The camera left-right adjustment plate 41 has a waist-shaped groove along the X-axis, allowing it to move relative to the camera up-down adjustment plate 4 along the X-axis to adjust its position, and can be fixed to the camera up-down adjustment plate 4 with bolts. A differential platform 42 is fixedly connected to the camera left-right adjustment plate 41. A camera front-back adjustment plate 43 is connected to the movable end of the differential platform 42. The differential platform 42 can be a manual angle-measuring displacement stage, allowing the camera angle to be adjusted along the Z-axis or Y-axis. The camera front-back adjustment plate 43 has a waist-shaped groove along the Y-axis, allowing it to move relative to the camera left-right adjustment plate 41 along the Y-axis to adjust its position, and can be fixed to the differential platform 42 with bolts. The front and rear adjustment plate 43 of the camera is connected to the area scan camera 1, which facilitates fixing the area scan camera 1 and also facilitates adjusting the angle of the area scan camera 1.
[0037] Specifically, a light source fixing plate 44 is fixedly connected to the frame, and a light source up-down adjustment plate 45 is connected to the light source fixing plate 44. The light source fixing plate 44 has a slotted groove along the Z-axis to allow it to move relative to the light source fixing plate 44 along the Z-axis for easy position adjustment, and can be fixed relative to the light source fixing plate 44 by bolts. A light source angle adjustment plate 46 is hinged to the light source up-down adjustment plate 45, and the light source angle adjustment plate 46 is connected to the point light source 3. The light source angle adjustment plate 46 can rotate relative to the light source up-down adjustment plate 45 and is fixed relative to the light source up-down adjustment plate 45 by bolts.
[0038] Reference Figure 6 During operation, point light sources 3 from multiple directions enter the prism at a 55° angle from surface A 51. A portion of the light is reflected by the internal inclined surface D 54 onto the ink on surface E 55. The entire surface of the ink on surface E 55 is projected onto the mirror surface D 54 and then refracted to the camera to complete the defect imaging acquisition. Similarly, light from surface C 53 enters the prism from surface F 56, and the image is projected onto surface B 52.
[0039] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A multi-point light source prism internal imaging system, characterized in that, include A field array camera (1) is provided, with its imaging end facing the prism. Lens (2), wherein the lens (2) is disposed between the area array camera (1) and the prism; Point light source (3), the point light source (3) is tilted toward the prism and can be adjusted relative to the prism so that light enters the prism at a specific angle; The prism includes surface A, surface B, surface C and surface D, with surface E and surface F between surface A and surface C. Surface A and surface C are transparent, while the other four surfaces are coated with ink.
2. The prism internal imaging system based on a multi-point light source (3) according to claim 1, characterized in that, The point light source (3) is provided with multiple points surrounding the prism.
3. The prism internal imaging system based on a multi-point light source (3) according to claim 1, characterized in that, The angle at which the light emitted by the point light source (3) enters the prism is 50-60 degrees.
4. The prism internal imaging system based on a multi-point light source (3) according to claim 3, characterized in that, The light emitted by the point light source (3) enters the prism at an angle of 55 degrees.
5. The prism internal imaging system based on a multi-point light source (3) as described in claim 3, characterized in that, The lens (2) is a high-precision, large-field, deep-center lens (2) to accommodate the elevation difference of the slope.
6. The prism internal imaging system based on a multi-point light source (3) as described in claim 1, characterized in that, The multi-point light source (3) prism internal imaging system includes frame; The camera's vertical adjustment plate (4) is mounted on the frame and can move relative to the frame along the Z-axis. The left and right adjustment plate (41) of the camera is located on the up and down adjustment plate (4) of the camera and can move relative to the up and down adjustment plate (4) of the camera along the X-axis. The left and right adjustment plate (41) of the camera is connected to the area array camera (1).
7. The prism internal imaging system based on a multi-point light source (3) as described in claim 6, characterized in that, The camera left and right adjustment plate (41) is connected to the camera front and rear adjustment plate (43), which can move relative to the camera left and right adjustment plate (41) along the Y-axis direction. The camera front and rear adjustment plate (43) is connected to the area array camera (1).
8. The prism internal imaging system based on a multi-point light source (3) as described in claim 7, characterized in that, A differential platform (42) is connected to the left and right adjustment plate (41) of the camera, and the movable end of the differential platform (42) is connected to the front and rear adjustment plate (43) of the camera.
9. The prism internal imaging system based on a multi-point light source (3) as described in claim 8, characterized in that, The frame is provided with a light source fixing plate (44), and a light source up and down adjustment plate (45) is connected to the light source fixing plate (44). The light source up and down adjustment plate (45) is connected to the point light source (3), and the light source up and down adjustment plate (45) is adapted to move relative to the light source fixing plate (44) along the Z-axis direction.
10. The prism internal imaging system based on a multi-point light source (3) as described in claim 9, characterized in that, The light source up and down adjustment plate (45) is connected to the light source angle adjustment plate (46), which is connected to the point light source (3). The light source angle adjustment plate (46) can rotate relative to the light source up and down adjustment plate (45) to adjust the angle of the point light source (3).