A three-degree-of-freedom displacement-adjusted lens image quality detection device

Abstract

The application provides a three-freedom-displacement-adjusted lens image quality detection device, comprising: a base; an image source assembly arranged on the base; a three-axis displacement table arranged on the base and located on one side of the image source assembly; a lens clamping assembly arranged on the three-axis displacement table and used for clamping a to-be-detected optical lens, the lens clamping assembly moving along XYZ directions through driving of the three-axis displacement table; and an imaging assembly arranged on the base and located on a side of the three-axis displacement table away from the image source assembly; the image source assembly forms a detection image through imaging of the to-be-detected optical lens, and the imaging assembly is used for receiving the detection image. The problem that the adjustment of the detection tool in the height direction is limited in the prior art and cannot meet the adjustment requirements of high-end optical detection is solved.

Description

Technical Field

[0001] This application relates to the field of optical lens testing technology, and more specifically, to a lens image quality testing device with three-degree-of-freedom displacement adjustment. Background Technology

[0002] With the widespread application of optical systems in consumer electronics, industrial inspection, intelligent transportation, aerospace, and precision measurement, the requirements for lens image quality are increasing, and inspection technology has gradually become a key part of the optical manufacturing process. MTF testing, as a universal standard method, can quantify the contrast transfer capability of an optical system at different spatial frequencies, thereby comprehensively evaluating imaging performance. The reliability of MTF testing heavily relies on the high-precision alignment between the lens, light source, and detector. If the optical components are spatially misaligned or out of focus, the test results will significantly differ from the lens's true performance.

[0003] Existing technology first securely mounts the lens or camera system under test on an optical platform or tripod, precisely adjusts its optical axis to be perpendicular to the center of the test plane, and sets key parameters such as aperture, focus distance, ISO, and shutter speed. A uniform, stable, flicker-free light source with standard illumination is used to illuminate the test chart, ensuring operation in a dark room or low ambient light conditions to avoid stray light interference, and maintaining stable ambient temperature. During resolution testing, a resolution test board is placed on the test plane, filling the field of view or covering key areas. After precise focusing, the chart is photographed, and the imaging results are observed on a high-quality monitor. Interpretation is performed from low to high frequency groups, recording the spatial frequency (line pair / mm or period / pixel) corresponding to the highest frequency group that clearly distinguishes the three lines. Current common testing fixtures mostly use two-dimensional slides or single-degree-of-freedom threaded adjustments, which can only achieve basic focal plane positioning in the planar or front-back directions, but are limited in the height direction, resulting in tests that cannot meet the adjustment requirements of high-end optical inspection.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] The purpose of this application is to provide a lens image quality inspection device with three-degree-of-freedom displacement adjustment, which solves the problem that the adjustment of the inspection fixture in the existing technology is limited in the height direction and cannot meet the adjustment requirements of high-end optical inspection.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] This application provides a lens image quality detection device with three-degree-of-freedom displacement adjustment, comprising:

[0008] Base;

[0009] Like the source component, the source component is set on the base;

[0010] A three-axis displacement stage is mounted on the base and located on one side of the image source assembly.

[0011] The lens clamping assembly is mounted on a three-axis displacement stage and is used to clamp the optical lens to be tested. The lens clamping assembly moves along the XYZ direction by the drive of the three-axis displacement stage.

[0012] The imaging component is mounted on the base and located on the side of the three-axis displacement stage away from the image source component;

[0013] The image source component forms a detection image through imaging by the optical lens under test, and the imaging component is used to receive the detection image.

[0014] In an optional embodiment, the lens clamping assembly includes: a support base plate disposed on a three-axis displacement stage;

[0015] The first clamping member is arranged on the left and right sides at intervals. The first clamping member includes a vertical clamping plate and a horizontal connecting plate. The vertical clamping plates on both sides are used to abut against and clamp the first outer wall of the optical lens to be tested. The horizontal connecting plate is adjustablely arranged on the support base plate.

[0016] The first adjusting locking device is inserted through the horizontal connecting plate and connected to the bearing base plate.

[0017] In an optional embodiment, the lens clamping assembly further includes: a second clamping member disposed at a distance from the first clamping member;

[0018] A clamping space is formed between the second clamping members on both sides, and the width of the clamping space is greater than the outer diameter of the second outer wall of the optical lens under test.

[0019] In an optional embodiment, both the first clamping member and the second clamping member are provided with guide rounded corners, and an opening that is wider at the top and narrower at the bottom is formed between the guide rounded corners on the left and right sides.

[0020] In an optional embodiment, the image source component includes: an image source carrier disposed on a base;

[0021] The light source board is vertically mounted on the source support and is used to emit background light toward the optical lens under test.

[0022] The target is set on the light-emitting side of the light source plate.

[0023] In an optional embodiment, the image source carrier includes a card slot disposed on the base;

[0024] The card slot has an upward-facing slot into which the light source board is inserted.

[0025] In an optional embodiment, the imaging component includes: a lens mount disposed on a base;

[0026] Lens support, which is fixedly mounted on the lens mount;

[0027] Imager, the imager is attached to the lens mount;

[0028] The base is equipped with a first positioning pin, and the lens mount is positioned on the base by the first positioning pin;

[0029] The lens mount is equipped with a second positioning pin, which positions the lens carrier on the lens mount.

[0030] In an optional embodiment, the lens image quality detection device further includes: a light box assembly disposed between the image source assembly and the lens clamping assembly;

[0031] The polarizing component is located on the light-emitting side of the light box component.

[0032] In an optional embodiment, the lightbox assembly includes: a lightbox base disposed on a base;

[0033] A coaxial light box, which can be adjusted and mounted on a light box base;

[0034] The light box base has a guide slot, and an adjusting fastener is connected to the side wall of the guide slot. The coaxial light box can be movably installed in the guide slot and locked in place by adjusting the fastener.

[0035] In an optional embodiment, the polarizing assembly includes: a polarizing clamp, which is adjustablely disposed on the lamp box base.

[0036] A polarizing filter is mounted on a polarizing clamp.

[0037] The polarizing clamping component includes: clamping plates spaced apart on the left and right sides, and the clamping plates include clamping positions and adjustment holes;

[0038] The clamping slots on the left and right sides are used to clamp the polarizing filter;

[0039] The adjustment holes on the left and right sides are adjustable and connected to the light box base by screws.

[0040] The beneficial effects of the lens image quality testing device with three-degree-of-freedom displacement adjustment provided in this application are at least as follows: By sequentially arranging an image source component, a three-axis displacement stage, a lens clamping component, and an imaging component on a base, the lens clamping component holds the optical lens under test, thereby enabling the image source component to form a test image through the imaging of the optical lens under test. The imaging component is used to receive the test image, realizing the testing of the optical lens under test. Based on the high sensitivity of MTF to the focal plane position (whether object-side or image-side), a three-axis displacement stage is used to drive the lens clamping component to move along the XYZ directions, thereby causing the optical lens under test to generate minute displacements in the X / Y / Z directions, adjusting the optical lens under test to the optimal test position, facilitating image quality analysis and testing by the imaging component. Therefore, this lens image quality testing device can achieve high-precision adjustment of the position of the optical lens under test in three-dimensional space, ensuring the accuracy of optical alignment. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of a lens image quality detection device with three degrees of freedom displacement adjustment provided in this application embodiment during use;

[0043] Figure 2 A schematic diagram of the structure of a three-axis displacement stage for a lens image quality detection device with three degrees of freedom displacement adjustment provided in an embodiment of this application;

[0044] Figure 3 A schematic diagram of the lens clamping assembly in a lens image quality testing device with three degrees of freedom displacement adjustment provided in this application embodiment during use;

[0045] Figure 4 An exploded view of the image source component in a lens image quality detection device with three-degree-of-freedom displacement adjustment provided in an embodiment of this application;

[0046] Figure 5 An exploded view of the imaging component in a lens image quality detection device with three degrees of freedom displacement adjustment provided in an embodiment of this application;

[0047] Figure 6 A schematic diagram of the structure of the light box assembly and the polarizing assembly in a lens image quality detection device with three degrees of freedom displacement adjustment provided in an embodiment of this application;

[0048] Figure 7An exploded view of the light box assembly and polarizing assembly in a lens image quality detection device with three degrees of freedom displacement adjustment provided in an embodiment of this application.

[0049] The following are the labeling elements in the figure:

[0050] 10. Optical lens under test; 11. First outer wall; 12. Second outer wall; 13. Lens barrel step; 100. Base; 200. Image source assembly; 210. Image source carrier; 211. Insertion block; 212. Insertion port; 220. Light source plate; 230. Target; 300. Three-axis displacement stage; 310. Differential head; 400. Lens clamping assembly; 410. Support base plate; 420. First clamping component; 421. Vertical clamping plate; 422. Horizontal connecting plate; 423. Guide radius; 430. First adjusting locking component; 440 441. Second clamping component; 450. Second adjusting locking fastener; 500. Imaging assembly; 510. Lens mount; 511. First positioning pin; 512. Second positioning pin; 520. Lens carrier; 530. Imager; 600. Light box assembly; 610. Light box base; 611. Guide slot; 612. Adjusting fastener; 620. Coaxial light box; 700. Polarizing assembly; 710. Polarizing clamping component; 711. Clamping plate; 712. Clamping slot; 713. Adjustment hole; 720. Polarizing filter. Detailed Implementation

[0051] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0052] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0053] The technical terms used in this embodiment are explained as follows:

[0054] Focusing plane: refers to the process of adjusting the distance between the lens and the image sensor in photography or optics to ensure that the subject is in sharp focus.

[0055] Image quality analysis: Image quality analysis, image quality is the core indicator for measuring the imaging quality of optical systems in the field of optical instruments;

[0056] Spatial frequency: the number of pairs of bright and dark stripes per unit length (unit: lp / mm). High frequencies correspond to fine details, while low frequencies correspond to macroscopic contrast.

[0057] Coaxiality: refers to the degree to which the axis of the measured element does not deviate from the reference axis;

[0058] Image plane: The surface on which light rays converge or are reflected after passing through a lens or mirror to form an image;

[0059] Object surface: The surface formed before light rays enter a lens or mirror from an object.

[0060] Defocus: The surface formed before light rays enter a lens or mirror from an object.

[0061] Other drawbacks of the existing technology are as follows:

[0062] In addition to the aforementioned drawbacks, existing testing fixtures typically only support unidirectional (1 degree of freedom) or two-dimensional (2 degrees of freedom) movement, making it difficult to achieve high-precision alignment in three-dimensional space and resulting in insufficient adjustment freedom. Secondly, existing testing fixtures have low positioning accuracy; the minimum resolution of traditional threaded or sliding mechanisms is mostly above 0.05mm, while MTF testing requires extremely high focal plane positioning down to 0.01mm, making it impossible for existing devices to eliminate errors caused by defocusing. Thirdly, existing clamping mechanisms are crudely designed, generally employing rigid clamping methods, which can not only cause uneven force on the lens and optical axis tilt but also easily lead to stress concentration, causing indentations or scratches on the lens surface. Fourthly, in batch testing, the lens installation and calibration steps are cumbersome, and frequent disassembly and assembly increase the testing cycle and reduce work efficiency. Finally, due to a lack of modularity and versatility, existing fixtures often only adapt to specific lens models, resulting in a narrow range of applications and failing to meet the needs of multi-specification testing. These shortcomings lead to insufficient accuracy and poor repeatability of test results, making them unable to support the urgent requirements of the modern optical industry for high-precision testing. To address the aforementioned problems, this application proposes a lens image quality detection device with three-degree-of-freedom displacement adjustment for improvement.

[0063] Please see Figure 1 The specific structure of the lens image quality testing device with three-degree-of-freedom displacement adjustment proposed in this embodiment is described below: It is used to test the optical lens 10 under test. Please refer to [link / reference]. Figure 1 , Figure 3For example, a certain optical lens 10 under test has a part size of Φ35x106 and has a first outer cylinder (corresponding to the first outer wall 11) and a second outer cylinder (corresponding to the second outer wall 12) with a smaller diameter. The outer diameter of the first outer cylinder is smaller than the outer diameter of the second outer cylinder. The outer diameter of the second outer cylinder is Φ35. A lens barrel step 13 is formed between the first outer cylinder and the second outer cylinder.

[0064] For ease of structural description, the direction of the detection optical path during testing is taken as the front-back direction (i.e., the axis of the optical lens 10 under test), the direction perpendicular to the front direction on the horizontal plane is taken as the left-right direction, and the vertical direction is taken as the up-down direction. All components in this embodiment are described based on this direction.

[0065] Please see Figure 1 The three-degree-of-freedom displacement-adjustable lens image quality detection device of this embodiment mainly includes: an image source assembly 200, a three-axis displacement stage 300, a lens clamping assembly 400, and an imaging assembly 500. The base 100 is located in the downward direction and extends a predetermined length in the front-back direction. The base 100 can be a T-shaped base plate, which is made of high-rigidity metal sheet to ensure overall stability and vibration resistance, providing a standard mounting reference for other components. The image source assembly 200 is disposed on the base 100 and located at the foremost point of the base 100, providing a target object by emitting light. A three-axis displacement stage 300 is mounted on the base 100 and located behind the image source assembly 200. A lens clamping assembly 400 is mounted on top of the three-axis displacement stage 300. The optical lens under test 10 is mounted on the lens clamping assembly 400, thus positioning the optical lens under test 10 behind the image source assembly 200. The lens clamping assembly 400 moves along the X (front-back direction), Y (left-right direction), and Z (up-down direction) directions driven by the three-axis displacement stage 300, thereby allowing the optical lens under test 10 to move in the front-back, left-right, and up-down directions, achieving position adjustment of the optical lens under test 10. An imaging assembly 500 is mounted on the base 100 and located behind the three-axis displacement stage 300. The image source assembly 200 forms a test image through imaging of the optical lens under test 10, and the imaging assembly 500 is used to receive the test image.

[0066] The lens image quality testing device with three-degree-of-freedom displacement adjustment in this embodiment consists of an image source component 200, a three-axis displacement stage 300, a lens clamping component 400, and an imaging component 500 arranged sequentially on a base 100. The lens clamping component 400 clamps the optical lens 10 to be tested. During the testing process, the height of the optical lens under test 10, the distance between the optical lens under test 10 and the image source assembly 200, and the distance between the optical lens under test 10 and the imaging assembly 500 are controlled. The target 230 of the image source assembly 200 and the camera of the imaging assembly 500 are adjusted in height and position according to the index range. After fixing the relevant variables, the optical lens under test 10 is moved in three directions by adjusting the three-axis displacement stage 300 until it is moved to a reasonable range, so that the image source assembly 200 forms a test image through the imaging of the optical lens under test 10. The imaging assembly 500 is used to receive the test image to realize the testing of the optical lens under test 10. Based on the high sensitivity of the MTF to the focal plane position (whether object side or image side), the three-axis displacement stage 300 is used to drive the lens clamping assembly 400 to move along the XYZ direction, thereby causing the optical lens under test 10 to produce a small displacement in the three directions of X (front and back direction) / Y (left and right direction) / Z (up and down direction), so that the optical lens under test 10 is adjusted to the optimal test position. It enables independent and high-precision control in the X, Y, and Z directions, thereby ensuring that the optical lens under test 10 is strictly aligned with the standard optical path, achieving more accurate and stable lens testing.

[0067] Because MTF testing systems are extremely sensitive to focal plane position and optical alignment accuracy, even a minute defocusing of 0.01mm can cause a sharp drop in high-frequency MTF values, leading to discrepancies between the test results and the lens's actual imaging performance. Furthermore, existing adjustment mechanisms are mostly manually operated, with accuracy limited by the resolution of the lead screw or slide rail and the operator's experience, resulting in poor repeatability and low efficiency. Please refer to [link / reference]. Figure 1 , Figure 2Therefore, the three-axis displacement stage 300 in this embodiment achieves independent adjustment in three directions (X (front-back direction), Y (left-right direction), and Z (up-down direction) through precision lead screws and linear guides, with the adjustment step size controllable within 0.01mm. The three-axis displacement stage 300 has three micrometer heads 310, enabling fine-tuning in three directions, thus placing the optical lens 10 under test within the calibrated testing area and ensuring the workpiece is in the optimal testing position. This three-axis displacement stage 300 can quickly compensate for lens position errors, ensuring the lens remains within the optimal focal plane during testing. The three-axis displacement stage 300 allows the optical lens 10 under test to achieve independent 0.01mm-level precision displacement adjustment in the X, Y, and Z directions, ensuring strict alignment with the focal plane and optical axis during MTF testing, thereby obtaining reliable imaging quality data. The three-axis displacement stage 300 achieves ultra-high precision displacement of 0.01mm, meeting the stringent requirements of modern high-pixel sensors for lens fine-tuning.

[0068] Existing lens fixing methods generally employ rigid clamping or single-point limiting, which can easily lead to uneven force on the lens and optical axis tilting, and may also cause permanent damage to the optical surface under high pressure. During batch testing, the lack of flexible clamping and rapid calibration structures results in low testing efficiency, and differences between different operators lead to insufficient consistency and comparability of test results. Therefore, this embodiment employs a special lens clamping assembly 400 to solve the above problems.

[0069] Please see Figure 1 , Figure 3The lens clamping assembly 400 in this embodiment specifically includes: a supporting base plate 410, first clamping members 420 spaced apart on the left and right, and a first adjusting locking member 430. The supporting base plate 410 is horizontally arranged and fixed to the three-axis displacement stage 300 by screws. The first clamping member 420 includes a vertical clamping plate 421 and a horizontal connecting plate 422, which form an L-shaped right-angle clamping member. The first clamping member 420 is adjustablely disposed on the left and right sides. The vertical clamping plates 421 on both sides are used to abut against and clamp the first outer wall 11 of the optical lens 10 under test. The optical lens 10 under test is placed on the supporting base plate 410, and the optical lens 10 under test can be clamped on the left and right sides by the vertical clamping plates 421, so that the optical lens 10 under test is positioned in the left and right directions. The front side wall of the vertical clamping plate 421 can abut against the lens barrel step 13, so that the optical lens 10 under test is positioned in the front and back directions, achieving stable clamping of the optical lens 10 under test. Furthermore, an opening is formed above the vertical clamping plates 421 on both sides to facilitate the removal and placement of the optical lens 10 under test. The horizontal connecting plate 422 extends a predetermined length outward in the left-right direction and is adjustablely mounted on the supporting base plate 410 via a first adjusting fastener 430. Specifically, the horizontal connecting plate 422 has a first oblong hole in the left-right direction. The first adjusting fastener 430 can be a screw, which passes through the first oblong hole of the horizontal connecting plate 422 and is screwed onto the supporting base plate 410. This allows adjustment of the position of the first clamping member 420 in the left-right direction, enabling clamping not only according to the actual outer diameter of the optical lens 10 under test, achieving a flexible connection process, but also adapting to optical lenses 10 of different sizes and specifications under test. Therefore, in this embodiment, the first clamping member 420 establishes a rigid displacement boundary through mechanical constraints, and locks the optical lens 10 under test in conjunction with the positioning of the first adjusting fastener 430, effectively suppressing external vibration and displacement drift, with a displacement repeatability error ≤ ±0.003mm.

[0070] The lens clamping assembly 400 of this embodiment further includes: second clamping members 440 spaced apart from each other on the left and right sides, and second adjusting fasteners 450. The second clamping members 440 and the first clamping member 420 are spaced apart in the front-back direction. The second clamping members 440 on the left and right sides are respectively adjustablely mounted on the support base plate 410 through the second adjusting fasteners 450. A locking space 441 is formed between the second clamping members 440 on the left and right sides, and the width of the locking space 441 is greater than the outer diameter of the second outer wall 12 of the optical lens 10 under test. In the specific structure, the second clamping members 440 and the first clamping members 420 have the same structure, but act at different positions of the optical lens 10 under test. Since the outer diameter of the second outer wall 12 of the optical lens 10 under test is greater than the outer diameter of the first outer wall 11, when the first outer wall 11 is clamped, the second outer wall 12 only serves as a straightening and alignment function during the installation process. Therefore, the adjusting clamping space 441 between the second clamping members 440 is 0.2mm larger on each side than the outer diameter of the second outer wall 12 of the optical lens 10 under test. For example, if the outer diameter of the second outer wall 12 of the optical lens 10 under test is Φ35, then before placing the optical lens 10 under test, the spacing of the clamping space 441 is measured with calipers and the second clamping members 440 on both sides are adjusted. The total width of the clamping space 441 is 35.4mm, so that the distance between the end faces of the second outer wall 12 and the second clamping members 440 is 0.2mm on each side. In this way, when placing the optical lens 10 under test, the second clamping members 440 on both sides provide approximate positioning, and finally, the first clamping members 420 on both sides at the rear clamp it, making the installation of the optical lens 10 under test more convenient and avoiding damage to the optical lens 10 under test caused by rigid compression.

[0071] In addition, both the first clamping member 420 and the second clamping member 440 in this embodiment are provided with guide rounded corners 423, forming an opening that is wider at the top and narrower at the bottom between the guide rounded corners 423 on the left and right sides. This makes it easier to place the optical lens 10 under test and makes it easier to pick up and put down the optical lens 10 under test.

[0072] For example, in the specific process of fixing the optical lens 10 under test, the second outer wall 12 of the optical lens 10 under test is placed between the second clamping members 440 on the left and right sides, and the first outer wall 11 of the optical lens 10 under test is placed between the first clamping members 420 on the left and right sides. Adjust the second adjusting fastener 450, slide the second clamping members 440 on the left and right sides, and when the size of the clamping space 441 measured with a vernier caliper is 35.4mm, tighten the second adjusting fastener 450. Then adjust and slide the first clamping members 420 on the left and right sides, and adjust the vertical clamping plates 421 of the first clamping members 420 on the left and right sides to fit against the first outer wall 11, tighten the first adjusting fastener 430. At this point, the placement position of the optical lens 10 under test is adjusted. Therefore, compared with existing tooling, which generally lacks modular design and is difficult to be compatible with lenses of different diameters and structural forms, resulting in low equipment utilization, this method offers a significant advantage. The lens clamping assembly 400 in this embodiment adopts a modular design, which can be compatible with lenses of different diameters and structural forms, improving equipment utilization. Furthermore, in mass production testing, after one debugging, the operator does not need to repeatedly disassemble and reassemble the lens and perform manual calibration. With the positions of the first clamping member 420 and the second clamping member 440 fixed, subsequent optical lenses 10 of the same specifications can be placed sequentially behind the lens clamping assembly 400, greatly improving testing efficiency.

[0073] In this embodiment, the lens clamping assembly 400 forms a stable placement cavity with a symmetrically arranged first clamping member 420 and a first adjusting locking member 430, and a second clamping member 440 and a second adjusting locking member 450. After the optical lens 10 to be tested is placed, the first clamping member 420 and the second clamping member 440 uniformly limit its outer periphery, while the first adjusting locking member 430 and the second adjusting locking member 450 apply force slowly, which can avoid damage to the surface of the optical lens caused by uneven clamping or excessive pressure. The flexible limiting structure achieves safe fixation of the optical lens, thereby improving the detection accuracy, efficiency, and repeatability.

[0074] Please see Figure 1 , Figure 4The image source assembly 200 in this embodiment specifically includes: an image source carrier 210, a light source plate 220, and a target 230. The image source carrier 210 can be mounted on the base 100 by screws. The light source plate 220 is vertically mounted on the image source carrier 210 and is used to emit background light toward the optical lens 10 under test. The target 230 is located on the light-emitting side of the light source plate 220. The target 230 is illuminated by the light emitted by the light source plate 220, thereby enabling the target 230 to be imaged in the optical lens 10 under test behind it. The image source carrier 210 in this embodiment specifically includes a card slot 211, which is mounted on the base 100. The card slot 211 has an upward-facing slot 212 in which the light source plate 220 is inserted. The insertion block 211 is U-shaped. An adjusting screw (not shown in the figure) can be inserted through the front outer wall of the insertion block 211. The adjusting screw is used to press the light source plate 220 located in the insertion slot 212. The light source plate 220 is installed in the insertion slot 212, ensuring that the bottom end face of the light source plate 220 is in contact with the inner wall end face of the insertion block 211. Then, the adjusting screw is tightened. Adjust the height of the imager 530 (camera) in the imaging assembly 500 to ensure that the optical axis of the imager 530 (camera) is perpendicular to the surface of the target 230 on the light source plate 220.

[0075] Please see Figure 1 , Figure 5 The imaging assembly 500 in this embodiment specifically includes a lens mount 510, a lens carrier 520, and an imager 530 (camera). The lens mount 510 is disposed on the base 100 and located at the rear end of the base 100. The lens carrier 520 is fixedly disposed on the lens mount 510 by screws, and the imager 530 is connected to the lens carrier 520. The lens mount 510 can be configured to be replaceable and matched according to different sizes of optical lenses 10 under test. Typically, the left-right and front-back positions of the imager 530 are fixed standard positions. Even when replacing the lens mount 510 with one of different heights, it is necessary to avoid changes in the left-right and front-back positions of the imager 530. Therefore, to ensure repeatability and avoid prolonged adjustments to the position of the imager 530, a first positioning pin 511 is provided on the base 100. The lens mount 510 is positioned on the base 100 via the first positioning pin 511. A second positioning pin 512 is provided on the lens mount 510, and the lens carrier 520 is positioned on the lens mount 510 via the second positioning pin 512. In this way, when adjusting the height of the lens mount 510 (replacing with a lens mount 510 of different heights), the position of the imager 530 can be guaranteed, thereby ensuring the repeatability and comparability of the test results.

[0076] Please see Figure 1 , Figure 6 , Figure 7Furthermore, the lens image quality testing device of this embodiment also includes a light box assembly 600 and a polarizing assembly 700. The light box assembly 600 is disposed between the image source assembly 200 and the lens clamping assembly 400, and the polarizing assembly 700 is disposed on the light-emitting side of the light box assembly 600. Light emitted from the image source assembly 200 enters the light box assembly 600, then the polarizing assembly 700, and finally the optical lens 10 under test. The light box assembly 600 converts the light source into an infinitely far, uniform, and high-brightness surface light source through an optical system (compound eye lens / integrating rod) and a collimating lens. The polarizing assembly 700 is used to eliminate stray light inside the optical lens. This improves measurement accuracy and reliability.

[0077] Please see Figure 1 , Figure 6 , Figure 7 The lightbox assembly 600 in this embodiment specifically includes a lightbox base 610 and a coaxial lightbox 620. The lightbox base 610 is mounted on the base 100, and the coaxial lightbox 620 is adjustablely mounted on the lightbox base 610. The coaxial lightbox 620 can provide an infinitely far, uniform, and high-contrast test target, thereby solving the problems of test distance, uneven illumination, and insufficient original contrast.

[0078] Please see Figure 6 , Figure 7 A guide slot 611 is provided on the light box base 610. The guide slot 611 extends through the front-to-back direction and forms sidewalls in the left-to-right direction. Adjusting fasteners 612, which can be set screws, are connected to the sidewalls in the left and right directions of the guide slot 611. The coaxial light box 620 is movably disposed in the guide slot 611 in the front-to-back direction and is locked in place by adjusting the fasteners 612. When the distance between the coaxial light box 620 and the light source plate 220 is adjusted, the adjusting fasteners 612 are tightened after adjustment to lock the position of the coaxial light box 620. The polarizing assembly 700 in this embodiment specifically includes a polarizing clamp 710 and a polarizing mirror 720. The polarizing clamp 710 is adjustablely disposed on the light box base 610, and the polarizing mirror 720 is disposed on the polarizing clamp 710. The polarizing filter 720 can suppress stray light generated by internal reflections of the lens, solving the problem of stray light reducing image contrast and causing distortion of MTF measurement values.

[0079] Please see Figure 1 , Figure 6 , Figure 7The polarizing clamp 710 specifically includes: clamping plates 711 spaced apart on the left and right sides. Each clamping plate 711 includes clamping slots 712 and adjustment holes 713. The clamping slots 712 on both sides are used to clamp the polarizing lens 720. The adjustment holes 713 on both sides (which can be oblong holes) are adjustablely connected to the lamp housing base 610 via screws. By adjusting the clamping plates 711 spaced apart on the left and right sides, the position of the polarizing lens 720 can be adjusted, ensuring that the polarizing lens 720 is coaxial with the optical axis of the lens 10 under test. After the polarizing lens 720 is positioned through the adjustment holes 713 (grooves), the overall adjustment achieves coaxiality between the center of the polarizing lens 720 and the camera optical axis (accuracy ≤ 0.005 mm), eliminating aberrations caused by optical element eccentricity. Precise locking of the coaxial lamp housing 620 spacing ensures the stability of the illumination optical path and avoids detection errors caused by light source offset. Secondly, the position of the adjustment holes 713 on the left and right sides can be adjusted so that a polarizer 720 of the appropriate size can be clamped according to the different specifications of the optical lens 10 under test.

[0080] The specific working process of the lens image quality testing device with three-degree-of-freedom displacement adjustment in this embodiment is as follows: The optical lens 10 under test is placed in the lens clamping assembly 400 and locked → A standard test optical path is established through the image source assembly 200, the height of the light source plate 220 and the imager 530 is adjusted to ensure that the optical axis is perpendicular to the light source plate 220, and the key parameters such as the aperture, focus distance, sensitivity, and shutter speed of the imager 530 are set. The distance between the polarizer 720 and the coaxial light box 620 and the light source plate 220 is adjusted to be within the specified range → The three-axis displacement stage 300 is adjusted to achieve precise alignment of the optical lens 10 under test in the three directions of X (front and back) / Y (left and right) / Z (up and down) → The image is captured through the imaging assembly 500, and MTF analysis is performed (i.e., after precise focusing, the image card is photographed, and then the imaging result is observed under a high-quality display. The image is interpreted from low frequency to high frequency groups, and the spatial frequency (line pair / mm or period / pixel) corresponding to the highest frequency group that can clearly distinguish the three lines is recorded to complete the image quality testing) → The test results are recorded. This process is simple to operate, quick to position, and produces stable and reliable test results. This lens image quality testing device employs three-degree-of-freedom fine-tuning to ensure precise focal plane alignment, avoiding MTF deviations caused by defocusing. It significantly improves operational efficiency, enabling rapid installation and alignment, reducing adjustment time, and is suitable for batch testing. It provides strong lens protection through flexible limiting and buffering designs to prevent uneven force or surface damage to the lens. The test results are stable and reliable; the locking and coaxial protection mechanisms ensure good repeatability and comparability. This method is highly versatile and can adapt to the testing needs of various lenses with different diameters and specifications, facilitating widespread application. From mechanical constraints → optical calibration → displacement execution → laser verification (instant feedback on out-of-tolerance), a self-correcting workflow is formed, reducing manual intervention. Three-axis independent control supports synchronous displacement, with a single adjustment time of less than 3 seconds, improving efficiency by more than 50% compared to traditional step-by-step operations.

[0081] In summary, this application's lens image quality testing device with three-degree-of-freedom displacement adjustment enables the optical lens under test to achieve precise displacement adjustment at the 0.01mm level in the X, Y, and Z directions. This ensures strict alignment with the focal plane and optical axis during MTF testing, thereby obtaining accurate and reliable image quality data. Furthermore, the lens clamping method employs a lens clamping assembly combining symmetrical limiting and flexible buffering, ensuring uniform force distribution on the lens during fixation, guaranteeing stability, and effectively preventing damage to optical components. In addition, the modular design allows this lens image quality testing device to be compatible with optical lenses of different apertures and structural forms, significantly improving the equipment's versatility and applicability. Through these structures, this application not only overcomes the shortcomings of existing tooling in terms of accuracy, stability, and efficiency but also provides the optical industry with an efficient, reliable, and widely applicable testing tool.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lens image quality detection device with three-degree-of-freedom displacement adjustment, characterized in that, include: Base; Image source component, the image source component being disposed on the base; A three-axis displacement stage is mounted on the base and located on one side of the image source assembly; A lens clamping assembly is disposed on the three-axis displacement stage and used to clamp the optical lens to be tested. The lens clamping assembly moves along the XYZ direction by being driven by the three-axis displacement stage. An imaging assembly is disposed on the base and located on the side of the three-axis displacement stage opposite to the image source assembly; The image source component forms a detection image through imaging by the optical lens under test, and the imaging component is used to receive the detection image.

2. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 1, characterized in that, The lens clamping assembly includes: a support base plate, which is disposed on the three-axis displacement stage; The first clamping member is arranged at intervals on the left and right sides. The first clamping member includes a vertical clamping plate and a horizontal connecting plate. The vertical clamping plates on both sides are used to abut against and lock the first outer wall of the optical lens to be tested. The horizontal connecting plate is adjustablely arranged on the supporting base plate. The first adjusting locking fastener passes through the horizontal connecting plate and is connected to the bearing base plate.

3. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 2, characterized in that, The lens clamping assembly further includes: a second clamping member disposed at a left-right interval, the second clamping member being disposed at a distance from the first clamping member; A clamping space is formed between the second clamping members on both sides, and the width of the clamping space is greater than the outer diameter of the second outer wall of the optical lens under test.

4. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 3, characterized in that, Both the first clamping member and the second clamping member are provided with guide rounded corners, and an opening that is wider at the top and narrower at the bottom is formed between the guide rounded corners on the left and right sides.

5. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 1, characterized in that, The image source assembly includes: an image source carrier, which is disposed on the base; A light source board, which is vertically mounted on the source support base, is used to emit background light toward the optical lens under test; A target is disposed on the light-emitting side of the light source plate.

6. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 5, characterized in that, The image source carrier includes a card insertion block, which is disposed on the base. The card slot has an upward-facing socket, and the light source board is inserted into the socket.

7. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 1, characterized in that, The imaging assembly includes: a lens mount, which is disposed on the base; A lens carrier, which is fixedly mounted on the lens mount; An imager, which is connected to the lens carrier; The base is provided with a first positioning pin, and the lens mount is positioned on the base by the first positioning pin. The lens mount is provided with a second positioning pin, and the lens carrier is positioned on the lens mount by the second positioning pin.

8. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in any one of claims 1-7, characterized in that, The lens image quality detection device further includes: a light box assembly, which is disposed between the image source assembly and the lens clamping assembly; A polarizing component is disposed on the light-emitting side of the light box assembly.

9. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 8, characterized in that, The light box assembly includes: a light box base, which is disposed on the base; A coaxial light box, wherein the coaxial light box is adjustablely mounted on the light box base; The light box base is provided with a guide slot, and an adjusting fastener is connected to the side wall of the guide slot. The coaxial light box can be movably installed in the guide slot and locked in place by adjusting the fastener.

10. The lens image quality detection device with three-degree-of-freedom displacement adjustment as described in claim 9, characterized in that, The polarizing assembly includes: a polarizing clamp, which is adjustablely mounted on the lamp box base; A polarizing mirror, wherein the polarizing mirror is disposed on the polarizing clamp; The polarizing clamping component includes: clamping plates spaced apart on the left and right sides, the clamping plates including clamping positions and adjustment holes; The clamping slots on the left and right sides are used to clamp the polarizing mirror; The adjustment holes on the left and right sides are adjustablely connected to the lamp box base by screws.

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