Lens stray light detection device

Abstract

The utility model discloses a lens stray light detection device. The device comprises a supporting platform; the first linear moving module is mounted on the supporting platform and used for driving the second linear moving module to move in the first direction; the second linear moving module is used for driving the lens adjusting unit to move along a second direction; a first mounting seat of the lens adjusting unit is connected with the second linear moving module, a first motor is connected with the first mounting seat and used for driving the second mounting seat to rotate around a third direction, and a second motor is connected with the second mounting seat and used for driving the first fine tuning unit to rotate around a second direction; the first fine-tuning unit is used for driving the second fine-tuning unit to move along a first direction and a third direction, the second fine-tuning unit is used for driving the camera to move along a second direction, and the camera is also used for connecting a lens which can move and adjust along the second direction relative to the camera; and the illumination unit is used for providing illumination light for the lens. The device can improve the accuracy and efficiency of stray light detection, and is wide in application range.

Description

Technical Field

[0001] This utility model belongs to the field of lens inspection technology, specifically relating to a lens stray light detection device. Background Technology

[0002] As lenses continue to evolve, the demands on their performance are constantly increasing. However, stray light often accumulates after lens assembly. This stray light can cause unwanted flare or spots in the image, leading to artifacts, color distortion, affecting measurement results, and obscuring environmental details. Ultimately, it impacts image sharpness and color reproduction, reducing image quality and consequently affecting the performance and accuracy of the optical system. Stray light detection allows for the evaluation of a lens's imaging performance in real-world use, ensuring it delivers high-quality images. Furthermore, stray light detection not only verifies the performance of existing products but also helps designers identify potential problems in optical systems, enabling design optimization and reducing stray light generation. This is crucial for producing high-performance optical equipment.

[0003] Current stray light detection methods generally employ a light source that moves in a circle around the center of the lens to detect stray light at different angles. The structure of the detection device and the driving method of the light source are both manually operated. This detection method makes it difficult to ensure that the center of the light source is aligned with the optical axis of the lens, and it has a large radius of motion, a large footprint, poor operational stability, and cannot accurately control the shooting angle and object distance. It is difficult to know exactly which direction the lens has stray light, thus reducing the accuracy of stray light analysis, leading to misjudgment of the cause of stray light, reducing the image quality of the lens, and having low detection efficiency. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by proposing a lens stray light detection device that can improve the accuracy and efficiency of stray light detection.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model proposes a lens stray light detection device, comprising a support platform, a first linear motion module, a second linear motion module, a lens adjustment unit, and an illumination unit, wherein:

[0007] A first linear motion module is mounted on a support platform and is used to drive a second linear motion module to move along a first direction;

[0008] The second linear motion module is used to drive the lens adjustment unit to move along the second direction;

[0009] The lens adjustment unit includes a first mounting base, a first motor, a second mounting base, a second motor, a first fine-tuning unit, a second fine-tuning unit, and a camera. The first mounting base is connected to a second linear motion module. The first motor is connected to the first mounting base and is used to drive the second mounting base to rotate around a third direction. The second motor is connected to the second mounting base and is used to drive the first fine-tuning unit to rotate around a second direction. The first fine-tuning unit is used to drive the second fine-tuning unit to move along the first direction and the third direction. The second fine-tuning unit is used to drive the camera to move along the second direction. The camera is also used to connect to a lens, and the lens can be adjusted relative to the camera along the second direction. The first direction, the second direction, and the third direction are orthogonal to each other.

[0010] An illumination unit is used to provide illumination light to the lens.

[0011] Preferably, the lighting unit includes a bracket, a mounting plate, and a light source. The bracket is connected to a support platform, the mounting plate is detachably connected to the bracket, and the light source is connected to the mounting plate with its light-emitting side facing the lens.

[0012] Preferably, the mounting plate has several oblong holes and is connected to the bracket through screws passing through the oblong holes to achieve movement in a third direction.

[0013] Preferably, the light source is an infrared light source.

[0014] Preferably, the lens is threadedly connected to the camera.

[0015] Preferably, both the first linear motion module and the second linear motion module are sealed with flexible sealing covers.

[0016] Preferably, the second mounting base is L-shaped.

[0017] Preferably, the lens stray light detection device further includes a first position detection unit and a second position detection unit, wherein the first position detection unit is used to detect the rotational position of the second mounting base, and the second position detection unit is used to detect the rotational position of the first fine-tuning unit.

[0018] Preferably, the lens stray light detection device further includes a frame, which includes a housing, a support platform, a first linear motion module, a second linear motion module, a lens adjustment unit, and an illumination unit, all of which are built into the housing.

[0019] Preferably, the frame also includes several feet and several rollers, which are respectively installed at the bottom of the housing.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This application enables multi-degree-of-freedom adjustment of the lens to ensure that the optical center of the lens is coaxial with the rotation axis of the second motor during image acquisition, enabling multi-angle shooting, long movement distance, high accuracy of stray light detection, and precise control of each shooting angle and object distance. Furthermore, the second motor can be rotated to adjust and repeatedly acquire images, allowing for multiple detections of stray light at the same shooting angle, further improving detection accuracy. Additionally, the lens can be moved relative to the camera for focusing to ensure sharpness, and the second fine-tuning unit can move the camera to adapt to different camera models. It has a wide range of applications, modular design of each structure, convenient installation, and high detection efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the lens stray light detection device of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the lens stray light detection device of this utility model;

[0024] Figure 3 This is a schematic diagram of the first-view structure of the lens adjustment unit of this utility model;

[0025] Figure 4 This is a schematic diagram of the second perspective structure of the lens adjustment unit of this utility model;

[0026] Figure 5 This utility model Figure 4 A magnified view of a portion of the image (I).

[0027] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Support platform; 3. First linear motion module; 4. Second linear motion module; 5. Lens adjustment unit; 6. Illumination unit; 11. Housing; 12. Foot; 13. Roller; 51. First mounting base; 52. First motor; 53. Second mounting base; 54. Second motor; 55. First fine-tuning unit; 56. Second fine-tuning unit; 57. Camera; 58. Lens; 61. Bracket; 62. Mounting plate; 63. Light source. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application.

[0030] like Figures 1-5 As shown, a lens stray light detection device includes a support platform 2, a first linear motion module 3, a second linear motion module 4, a lens adjustment unit 5, and an illumination unit 6, wherein:

[0031] The first linear motion module 3 is mounted on the support platform 2 and is used to drive the second linear motion module 4 to move along the first direction;

[0032] The second linear motion module 4 is used to drive the lens adjustment unit 5 to move along the second direction;

[0033] The lens adjustment unit 5 includes a first mounting base 51, a first motor 52, a second mounting base 53, a second motor 54, a first fine-tuning unit 55, a second fine-tuning unit 56, and a camera 57. The first mounting base 51 is connected to the second linear motion module 4. The first motor 52 is connected to the first mounting base 51 and is used to drive the second mounting base 53 to rotate around a third direction. The second motor 54 is connected to the second mounting base 53 and is used to drive the first fine-tuning unit 55 to rotate around a second direction. The first fine-tuning unit 55 is used to drive the second fine-tuning unit 56 to move along the first direction and the third direction. The second fine-tuning unit 56 is used to drive the camera 57 to move along the second direction. The camera 57 is also used to connect to a lens 58, and the lens 58 can be adjusted relative to the camera 57 along the second direction. The first direction, the second direction, and the third direction are orthogonal to each other.

[0034] The illumination unit 6 is used to provide illumination light to the lens 58.

[0035] For ease of understanding, please refer to Figure 2 The first direction is the left-right direction (X direction), the second direction is the front-back direction (Y direction), and the third direction is the up-down direction (Z direction). This is for illustrative purposes only and the specific directions are not limited.

[0036] The lens adjustment unit 5 is pre-positioned by moving in the X and Y directions using the first linear motion module 3 and the second linear motion module 4, placing it near the center of the illumination area of ​​the light source 63. The first motor 52 adjusts the shooting angle of the lens 58 relative to the light source 63. The first fine-tuning unit 55 adjusts the lens 58 so that its optical axis aligns with the rotation axis of the second motor 54. Y-axis movement of the lens 58 relative to the camera 57 allows for focusing to ensure sharpness. The second fine-tuning unit 56 can move the camera 57 in the Y direction to adapt to different camera models. The second motor 54 drives the camera 57 to rotate, such as by a preset angle (180°, etc.), to measure and acquire the corresponding image at the same shooting angle again. These adjustments help ensure that the optical center of the camera 57 is coaxial with the rotation axis of the second motor 54 during image acquisition, thereby improving the accuracy of stray light detection.

[0037] In one embodiment, the lighting unit 6 includes a bracket 61, a mounting plate 62, and a light source 63. The bracket 61 is connected to the support platform 2, the mounting plate 62 is detachably connected to the bracket 61, and the light source 63 is connected to the mounting plate 62 with its light-emitting side facing the lens 58. Figure 2 As shown, the optical axis of the light source 63 is preferably parallel to the first direction (X direction).

[0038] In one embodiment, the mounting plate 62 has several oblong holes and is connected to the bracket 61 by screws passing through the oblong holes to achieve movement in a third direction. The vertical position of the mounting plate 62 can be adjusted, thereby adjusting the vertical position of the light source 63 to align with the center of the rotating shaft of the second motor 54 and improve the detection accuracy of stray light.

[0039] In one embodiment, the light source 63 is an infrared light source. The lens 58 may be an infrared lens or the like, and the light source 63 may be a 940nm infrared light source.

[0040] In one embodiment, the lens 58 is threadedly connected to the camera 57. It should be noted that the threaded connection can also be replaced by other connection methods in the prior art to enable the lens 58 to move and adjust relative to the camera 57 in a second direction, such as linear module drive.

[0041] In one embodiment, both the first linear motion module 3 and the second linear motion module 4 are sealed with flexible sealing covers. Sealing with flexible sealing covers helps prevent dust accumulation without affecting movement, thus extending the lifespan of the equipment.

[0042] In one embodiment, the second mounting base 53 is L-shaped. Alternatively, it can be any shape.

[0043] In one embodiment, the lens stray light detection device further includes a first position detection unit and a second position detection unit. The first position detection unit is used to detect the rotational position of the second mounting base 53, and the second position detection unit is used to detect the rotational position of the first fine-tuning unit 55. This facilitates precise positioning and improves work efficiency.

[0044] In one embodiment, the lens stray light detection device further includes a frame 1, which includes a housing 11. A support platform 2, a first linear motion module 3, a second linear motion module 4, a lens adjustment unit 5, and an illumination unit 6 are all built into the housing 11. The housing helps to prevent dust and improve safety. A control panel that is directly or indirectly connected to the electrical components can also be provided on the housing for easy operation.

[0045] In one embodiment, the frame 1 further includes a plurality of feet 12 and a plurality of rollers 13, which are respectively installed on the bottom of the housing 11. The feet 12 can be used to level the equipment, and the rollers 13 facilitate handling.

[0046] Working principle:

[0047] Before starting work, if a new camera 57 needs to be replaced, the second fine-tuning unit 56 is adjusted to move it to accommodate different camera models. After replacing the corresponding camera 57, the work is performed. First, the first linear movement module 3 and the second linear movement module 4 are driven to move the lens adjustment unit 5 to a position near the center of the illumination area of ​​the light source 63. The first fine-tuning unit 55 is then fine-tuned to align the camera 57 and lens 58 with the rotation axis of the second motor 54. By rotating the lens 58 relative to the camera 57, the distance between the focal point of the lens 58 and the imaging surface of the camera 57 is changed to adjust the focus and ensure sharpness. After adjustment, the optical center is made coaxial with the rotation axis of the second motor 54. Then, drive the first motor 52 to rotate the second mounting base 53 until the lens 58 is perpendicular to the mounting plate 62 of the light source 63. Then, swing the shooting angle and observe the image to confirm the initial position (e.g., take 0° as the initial position after debugging). Then, the camera 57 can collect stray light images at the current shooting angle. Traverse the required shooting angles (any angle from 0° to 180°, such as 15°, 30°, 45°, 60°, 75°, etc., set clockwise or counterclockwise with 0° as the reference, i.e., the preset shooting angle interval is 15°, and can be adjusted according to actual needs). Repeat the above actions until all required shooting angles have been measured. Then, the second motor 54 rotates 180°, i.e., drives the camera 57 to invert its vertical position and measure the same shooting angle and collect the corresponding image. After all measurements are completed, the operation ends. Based on the collected images, the influence of stray light during lens assembly can be detected. For example, stray light detection of images can be performed by manual observation or existing stray light detection technology (integrating sphere detection method, etc.). Lenses that meet the stray light requirements are considered good products. It should be noted that the above procedures are for ease of understanding only, and the specific procedures can be adjusted according to actual needs.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A lens flare detection device, characterized by: The lens stray light detection device comprises a support platform (2), a first linear movement module (3), a second linear movement module (4), a lens adjusting unit (5) and an illumination unit (6), wherein: The first linear movement module (3) is installed on the support platform (2) and is used to drive the second linear movement module (4) to move along a first direction; The second linear movement module (4) is used to drive the lens adjusting unit (5) to move along a second direction; The lens adjusting unit (5) comprises a first mounting seat (51), a first motor (52), a second mounting seat (53), a second motor (54), a first fine adjustment unit (55), a second fine adjustment unit (56) and a camera (57), the first mounting seat (51) is connected with the second linear movement module (4), the first motor (52) is connected with the first mounting seat (51) and is used to drive the second mounting seat (53) to rotate around a third direction, the second motor (54) is connected with the second mounting seat (53) and is used to drive the first fine adjustment unit (55) to rotate around the second direction, the first fine adjustment unit (55) is used to drive the second fine adjustment unit (56) to move along the first direction and the third direction, the second fine adjustment unit (56) is used to drive the camera (57) to move along the second direction, the camera (57) is also used to connect a lens (58) and the lens (58) can be adjusted to move along the second direction relative to the camera (57), the first direction, the second direction and the third direction are orthogonal to each other; The illumination unit (6) is used to provide illumination light to the lens (58).

2. The lens flare detection apparatus of claim 1, wherein: The illumination unit (6) comprises a bracket (61), a mounting plate (62) and a light source (63), the bracket (61) is connected with the support platform (2), the mounting plate (62) is detachably connected with the bracket (61), and the light source (63) is connected with the mounting plate (62) and the light emitting side faces the lens (58).

3. The lens flare detection apparatus of claim 2, wherein: A plurality of waist-shaped holes are formed in the mounting plate (62) and the mounting plate (62) is connected with the bracket (61) through screws penetrating the waist-shaped holes to realize movement along the third direction.

4. The lens flare detection apparatus of claim 2, wherein: The light source (63) is an infrared light source.

5. The lens flare detection apparatus of claim 1, wherein: The lens (58) is threadedly connected with the camera (57).

6. The lens flare detection apparatus of claim 1, wherein: The first linear movement module (3) and the second linear movement module (4) are both sealed by flexible sealing covers.

7. The lens flare detection apparatus of claim 1, wherein: The second mounting seat (53) is L-shaped.

8. The lens flare detection apparatus of claim 1, wherein: The lens stray light detection device further comprises a first position detection unit and a second position detection unit, the first position detection unit is used to detect the rotation position of the second mounting seat (53), and the second position detection unit is used to detect the rotation position of the first fine adjustment unit (55).

9. The lens flare detection apparatus of claim 1, wherein: The lens stray light detection device further comprises a rack (1), the rack (1) comprises a box body (11), and the support platform (2), the first linear movement module (3), the second linear movement module (4), the lens adjusting unit (5) and the illumination unit (6) are all built-in in the box body (11).

10. The lens flare detection apparatus of claim 9, wherein: The rack (1) further comprises several ground feet (12) and several rollers (13), which are respectively installed at the bottom of the box (11).

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