A detection device for optical lenses

Abstract

This utility model relates to a testing device for optical lenses, including a base, an outer sleeve and a sleeve assembly coaxially disposed above the base. The outer sleeve is rotatably mounted on the base via a first rotation drive assembly. A clamping assembly is provided on the top of the inner sleeve for clamping the optical lens to be tested. A pattern card holder is fixedly installed at the center of the base for providing standard test patterns. Several testing cameras are distributed circumferentially on the inner wall of the outer sleeve, with the shooting ends of the testing cameras all pointing towards the concentric axis of the device. This utility model uses a composite motion control system, where the first rotation drive assembly drives the outer sleeve to rotate, the second rotation drive assembly drives the inner sleeve to rotate independently, and a lifting drive assembly controls the overall height. The high-speed rotation of the inner sleeve and the synchronous or differential rotation of the inner and outer sleeves meet the testing requirements under different dynamic conditions, ensuring the accuracy of the testing results.

Description

Technical Field

[0001] This utility model relates to the field of optical lens testing technology, specifically to a testing device for optical lenses. Background Technology

[0002] As the core component of an imaging system, the manufacturing precision of an optical lens directly determines the quality of the final image. During the production process of an optical lens, it is necessary to conduct strict quality inspections, mainly including indicators such as center thickness, eccentricity, tilt, focal length, distortion, and modulation transfer function.

[0003] Existing testing devices for optical lenses can only perform static imaging tests, making it difficult to simulate the dynamic rotation or zoom process of lenses in actual use. They cannot effectively detect the optical axis stability and internal lens displacement of lenses in motion. Furthermore, some devices use discrete support structures, making long optical paths susceptible to environmental vibrations. The lack of effective synchronization or decoupling control between multi-layer motion mechanisms results in low repeatability. Based on this, we propose a testing device for optical lenses to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a testing device for optical lenses. Through a sleeve arranged along the shaft, it achieves composite motion control of outer sleeve rotation, independent rotation of inner sleeve, and overall lifting. This can meet the high-precision testing requirements under various working conditions and solves the problems of existing testing devices for optical lenses that can only perform static imaging tests and that some devices use discrete support structures.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a testing device for an optical lens, comprising a base, and an outer sleeve and a sleeve assembly coaxially disposed above the base. The outer sleeve is rotatably mounted on the base via a first rotation drive assembly. A clamping assembly is provided on the top of the inner sleeve for clamping the optical lens to be tested. A pattern card holder is fixedly installed at the center of the base for providing a standard test pattern. A plurality of testing cameras are distributed along the circumferential direction on the inner wall of the outer sleeve, and the shooting ends of the testing cameras all point to the concentric axis of the device. The sleeve assembly includes an annular support and an inner sleeve fixedly mounted on the annular support. The lower end of the annular support is movably connected to the base via a lifting drive assembly. The lifting drive mechanism is used to drive the annular support and the inner sleeve to move upward or downward relative to the outer sleeve along the axial direction. A second rotation drive assembly is provided on the inner side of the annular support. The second rotation drive mechanism is used to drive the inner sleeve and the optical lens under test to rotate around their own axis.

[0006] Furthermore, the first rotary drive mechanism includes a first servo motor fixedly mounted on the edge of the base, a first drive gear fixedly mounted on the output end of the first servo motor, and a first driven gear ring fixedly fitted on the inner wall of the outer sleeve. The first drive gear and the first driven gear ring are meshed and connected. When the first servo motor drives the first drive gear to rotate, it synchronously drives the outer sleeve to rotate around the base.

[0007] Furthermore, the lifting drive mechanism includes a column fixedly mounted on the base, a connecting plate slidably mounted on the side wall of the column, a toothed groove on the surface of the connecting plate, and a power motor fixedly mounted on the column. The upper end of the connecting plate and the lower end of the annular bearing seat are fixedly connected, and a power gear is meshed on the outer side of the toothed groove.

[0008] Furthermore, both ends of the power gear are rotatably connected to the upper end of the support plate and the column, and the output end of the power motor is connected to the power gear through a transmission structure. When the power motor drives the power gear to rotate, the meshing of the tooth grooves synchronously pushes the annular bearing seat to move up and down.

[0009] Furthermore, the second rotary drive mechanism includes a second servo motor fixedly mounted on the inner wall of the annular bearing seat, a third drive gear fixedly mounted on the output end of the second servo motor, and a second driven gear ring fixedly mounted on the inner wall of the inner sleeve. The third drive gear is meshed with the second driven gear ring.

[0010] Furthermore, the clamping assembly includes thrust cylinders arranged in a ring array. The fixed end of the thrust cylinder is fixedly connected to the outer wall of the inner sleeve. The output end of the thrust cylinder extends to the inner side of the inner sleeve and is fixedly connected to an arc-shaped clamping plate. The inner curved surface of the arc-shaped clamping plate fits the outer circumferential surface of the optical lens to be tested, and a flexible anti-slip pad is provided on the inner surface of the arc-shaped clamping plate.

[0011] Furthermore, the top of the outer sleeve is sealed with a top cover, and the detection camera is mounted on the upper part of the inner wall of the outer sleeve via an adjustable mounting assembly.

[0012] Furthermore, the adjustable mounting assembly includes an axial slide rail fixedly mounted on the inner wall of the outer sleeve, a mounting slider slidably mounted on the axial slide rail, and a locking member threaded onto the mounting slider. The locking member abuts against the axial slide rail and is used to lock the position of the mounting slider. The detection camera and the mounting slider are fixedly connected, and the optical axis of the detection camera is tilted vertically toward the concentric axis of the outer sleeve.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This testing device for optical lenses uses a composite motion control system that drives the outer sleeve to rotate through a first rotation drive component, drives the inner sleeve to rotate independently through a second rotation drive component, and controls the overall height through a lifting drive component. The high-speed rotation of the inner sleeve simulates the dynamic environment of the lens under actual zoom or gimbal rotation conditions, and captures and analyzes the optical axis stability, centrifugal displacement of the internal lens group, and assembly stress release of the lens in motion in real time. It effectively detects dynamic eccentricity problems that cannot be found by static testing. At the same time, it supports synchronous or differential rotation of the inner and outer sleeves, and can flexibly simulate a variety of complex relative motion scenarios, meeting the high requirements for comprehensive evaluation of the mechanical structure and optical performance of optical lenses, and ensuring the accuracy of the test results. 2. The detection device for optical lenses arranges all moving parts around the same central axis, eliminating errors caused by long optical paths and improving the rigidity of the overall structure and its ability to resist environmental vibration interference. At the same time, multiple sets of independently controlled adjustments ensure high-precision execution of single actions, and complex synchronous linkage can be achieved through logical coordination, avoiding positioning errors caused by interference from multiple mechanisms. Attached Figure Description

[0014] Figure 1 The diagram shown is a schematic representation of the internal structure of this utility model. Figure 2 The diagram shown is a schematic representation of the overall structure of this utility model. Figure 3 The diagram shown is a half-sectional view of the present invention. Figure 4 The diagram shown is a schematic diagram of the annular bearing seat structure of this utility model; Figure 5 The diagram shown is a schematic of the first driven toothed ring structure of this utility model; Figure 6 The diagram shown is a schematic of the column structure of this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Base; 101. First servo motor; 102. First driving gear; 103. First driven gear ring; 2. Outer sleeve; 3. Inner sleeve; 301. Thrust cylinder; 302. Arc-shaped clamping plate; 4. Card holder; 5. Top cover; 6. Annular bearing seat; 601. Column; 602. Connecting plate; 603. Gear groove; 604. Power motor; 605. Power gear; 7. Detection camera; 701. Axial slide rail; 702. Mounting slider; 8. Second servo motor; 801. Third driving gear; 802. Second driven gear ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-6 This embodiment provides a testing device for an optical lens, comprising a base 1, an outer sleeve 2 and a sleeve assembly coaxially disposed above the base 1. The outer sleeve 2 is rotatably mounted on the base 1 via a first rotation drive assembly. A clamping assembly is provided on the top of the inner sleeve 3 for clamping the optical lens under test. A pattern card holder 4 is fixedly mounted at the center of the base 1 for providing a standard test pattern. A plurality of testing cameras 7 are distributed along the circumferential direction on the inner wall of the outer sleeve 2, and the shooting ends of the testing cameras 7 all point to the concentric axis of the device. The sleeve assembly includes an annular support 6 and an inner sleeve 3 fixedly mounted on the annular support 6. The lower end of the annular support 6 is movably connected to the base 1 via a lifting drive assembly. The lifting drive assembly is used to drive the annular support 6 and the inner sleeve 3 to move upward or downward relative to the outer sleeve 2 along the axial direction. A second rotation drive assembly is provided on the inner side of the annular support 6 for driving the inner sleeve 3 and the optical lens under test to rotate around their own axis.

[0018] It should be noted that the multi-layered coaxial nested structure design integrates the traditional discrete optical path into a compact tower structure, which significantly shortens the optical path length, reduces the impact of environmental airflow disturbance and ground vibration on image quality, and achieves decoupling of motion degrees of freedom. The outer sleeve 2 is responsible for driving the camera to perform field-of-view scanning (revolution), while the inner sleeve 3 is responsible for carrying the lens for attitude adjustment or dynamic simulation (rotation and lifting), and moves around the same central axis. This eliminates the detection error caused by rotation and ensures that the lens optical center, the map center, and the camera optical axis always maintain an ideal geometric relationship under different motion combinations, thereby meeting the requirements of the G01M standard for high-precision structural integrity testing.

[0019] In this embodiment, the clamping assembly includes thrust cylinders 301 arranged in a ring array. The fixed end of the thrust cylinder 301 is fixedly connected to the outer wall of the inner sleeve 3. The output end of the thrust cylinder 301 extends to the inner side of the inner sleeve 3 and is fixedly connected to an arc-shaped clamping plate 302. The inner curved surface of the arc-shaped clamping plate 302 fits the outer circumferential surface of the optical lens to be tested, and a flexible anti-slip pad is provided on the inner surface of the arc-shaped clamping plate 302.

[0020] It should be noted that the thrust cylinder 301 can precisely control the clamping force by adjusting the air pressure, so as to avoid elastic deformation of the thin-walled lens barrel due to excessive clamping force. At the same time, a pressure sensor can be added to the arc-shaped clamping plate 302 to detect the clamping force.

[0021] Please see Figure 1 , Figure 2 and Figure 5 In this embodiment, the first rotary drive mechanism includes a first servo motor 101 fixedly installed on the edge of the base 1, a first drive gear 102 fixedly installed on the output end of the first servo motor 101, and a first driven gear ring 103 fixedly fitted on the inner wall of the outer sleeve 2. The first drive gear 102 and the first driven gear ring 103 are meshed and connected. When the first servo motor 101 drives the first drive gear 102 to rotate, it synchronously drives the outer sleeve 2 to rotate around the base 1.

[0022] It should be noted that the first servo motor 101 serves as a power source and drives the outer sleeve 2 to rotate through the meshing of gears and gear rings. The first servo motor 101 is equipped with a high-resolution encoder, which can achieve precise positioning at any angle (such as stopping to take pictures every 5°) or continuous uniform rotation, thereby driving the detection camera 7 to acquire images of the lens under test in the full field of view and efficiently complete the measurement of indicators such as MTF curve, distortion and relative illumination.

[0023] Please see Figure 1 , Figure 2 , Figure 4 and Figure 6 In this embodiment, the lifting drive mechanism includes a column 601 fixedly installed on the base 1, a connecting plate 602 slidably installed on the side wall of the column 601, a toothed groove 603 provided on the surface of the connecting plate 602, and a power motor 604 fixedly installed on the column 601. The upper end of the connecting plate 602 is fixedly connected to the lower end of the annular bearing seat 6. A power gear 605 is meshed on the outer side of the toothed groove 603. Both ends of the power gear 605 are rotatably connected to the upper end of the column 601 through a bracket plate. The output end of the power motor 604 is connected to the power gear 605 through a transmission structure. When the power motor 604 drives the power gear 605 to rotate, the annular bearing seat 6 is synchronously pushed up and down through the meshing of the toothed groove 603.

[0024] It should be noted that the cooperation between the column 601 and the connecting plate 602 forms a stable linear guide pair. There is one column 601 on each side, and the two power motors 604 adopt synchronous control to ensure that the lifting distance on both sides is synchronized. The synchronous control of the dual motors is a disclosed technical solution, as described in patent number (CN113746384B), which describes a multi-motor synchronous control device that can reliably and cost-effectively achieve synchronous movement of multiple motors using simple hardware circuits. This application will not provide a detailed description of the technical solution.

[0025] Please see Figure 1 , Figure 3 , Figure 4 and Figure 6 In this embodiment, the second rotary drive mechanism includes a second servo motor 8 fixedly mounted on the inner wall of the annular support 6, a third drive gear 801 fixedly mounted on the output end of the second servo motor 8, and a second driven gear ring 802 fixedly mounted on the inner wall of the inner sleeve 3. The third drive gear 801 and the second driven gear ring 802 are meshed and connected.

[0026] It should be noted that the rotation control of the inner sleeve 3 relative to the outer sleeve 2 increases the flexibility during testing, allowing the lens under test to rotate continuously at high speed or swing back and forth while the outer camera is stationary or moving independently, for dynamic testing. Furthermore, by analyzing the image jitter amplitude, center offset, and sharpness changes during lens rotation, the concentricity of the lens assembly, the gap of the spacer rings, and the dynamic stability of the overall structure can be effectively evaluated.

[0027] Please see Figure 1 , Figure 2 , Figure 5 In this embodiment, the top of the outer sleeve 2 is closed with a top cover 5. The detection camera 7 is installed on the upper part of the inner wall of the outer sleeve 2 through an adjustable mounting assembly. The adjustable mounting assembly includes an axial slide rail 701 fixedly installed on the inner wall of the outer sleeve 2, a mounting slider 702 slidably installed on the axial slide rail 701, and a locking member threaded on the mounting slider 702. The locking member abuts against the axial slide rail 701 and is used to lock the position of the mounting slider 702. The detection camera 7 and the mounting slider 702 are fixedly connected, and the optical axis of the detection camera 7 is vertically inclined to the concentric axis of the outer sleeve 2.

[0028] It should be noted that the top cover 5 can seal the top of the outer sleeve 2. Since the optimal working distance (WD) and field of view of lenses with different focal lengths and specifications are different, the distance and angle between the detection camera 7 and the lens can be flexibly changed by manually adjusting the height of the mounting slider 702 on the axial slide rail 701 by loosening the locking piece. At the same time, the connection between the detection camera 7 and the mounting slider 702 adopts an adjustable connection method, which is used to adjust the tilt angle of the detection camera 7 while adjusting the height of the detection camera 7.

[0029] The working principle of the above embodiments is as follows: First, the optical lens to be tested is placed at the center of the inner sleeve 3. The control system starts the thrust cylinder 301, which drives the four arc-shaped clamping plates 302 to retract centripetally. The lens is firmly and stress-free clamped and fixed using flexible anti-slip pads. Then, the power motor 604 drives the power gear 605 to rotate, driving the annular support 6 and the inner sleeve 3 to rise and fall smoothly along the column 601. During this process, the detection camera 7 acquires images of the image card holder 4 in real time, and finds the clearest focal plane through an image evaluation function (such as the gradient method) to complete automatic focusing. After focusing is completed, the static scanning mode is entered: the first servo motor 101 drives the outer sleeve 2 to rotate around the central axis (e.g., 0° to 360°), driving the detection camera 7 to revolve synchronously. At this time, the inner sleeve 3 remains stationary. The camera acquires imaging data of the lens onto a standard chart from different angles. Based on this, the system calculates static optical parameters such as the lens's MTF value, distortion, and chromatic aberration. If dynamic testing is required, the system switches to dynamic mode, the outer sleeve 2 stops or tracks at low speed, and the second servo motor 8 starts, driving the inner sleeve 3 and lens to rotate at high speed. Meanwhile, the detection camera 7 continuously captures or records images, analyzing the trajectory fluctuations and sharpness variations at the image center to assess the assembly eccentricity and rotational stability of the lens elements. Furthermore, the first servo motor 101 and the second servo motor 8 work together to make the outer sleeve 2 ( The camera and the inner sleeve 3 (lens) rotate in opposite or the same direction at a specific speed ratio to simulate complex relative motion scenarios (such as rotation during zooming), detect the consistency of the optical axis and the vibration resistance of the structure. At the same time, while the lens rotates or revolves, the lifting drive mechanism controls the inner sleeve 3 to move up and down reciprocally according to a preset curve to simulate the zooming process, detect the smoothness of the zoom trajectory and the image quality changes during the zooming process. All the acquired image data are transmitted to the industrial control computer in real time, and the dedicated algorithm software calculates the data to generate a comprehensive test report that includes static optical parameters and dynamic structural stability indicators.

[0030] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A detection device for an optical lens, comprising a base (1), characterized in that: It also includes an outer sleeve (2) and a sleeve assembly coaxially arranged above the base (1). The outer sleeve (2) is rotatably mounted on the base (1) via a first rotation drive assembly. A clamping assembly is provided on the top of the inner sleeve (3). The clamping assembly is used to clamp the optical lens to be tested. A pattern card holder (4) is fixedly installed at the center of the base (1). The pattern card holder (4) is used to provide standard test patterns. Several detection cameras (7) are distributed along the circumferential direction on the inner wall of the outer sleeve (2). The shooting ends of the detection cameras (7) all point to the concentric axis of the device. The sleeve assembly includes an annular support (6) and an inner sleeve (3) fixedly mounted on the annular support (6). The lower end of the annular support (6) is movably connected to the base (1) through a lifting drive assembly. The lifting drive mechanism is used to drive the annular support (6) and the inner sleeve (3) to move upward or downward relative to the outer sleeve (2) along the axial direction. A second rotation drive assembly is provided on the inner side of the annular support (6). The second rotation drive mechanism is used to drive the inner sleeve (3) and the optical lens under test to rotate around their own axis.

2. The detection device for an optical lens according to claim 1, characterized in that: The first rotary drive mechanism includes a first servo motor (101) fixedly installed on the edge of the base (1), a first drive gear (102) fixedly installed on the output end of the first servo motor (101), and a first driven gear ring (103) fixedly fitted on the inner wall of the outer sleeve (2). The first drive gear (102) and the first driven gear ring (103) are meshed and connected. When the first servo motor (101) drives the first drive gear (102) to rotate, it synchronously drives the outer sleeve (2) to rotate around the base (1).

3. The detection device for optical lens according to claim 1, wherein: The lifting drive mechanism includes a column (601) fixedly installed on the base (1), a connecting plate (602) slidably installed on the side wall of the column (601), a toothed groove (603) set on the surface of the connecting plate (602), and a power motor (604) fixedly installed on the column (601). The upper end of the connecting plate (602) and the lower end of the annular bearing seat (6) are fixedly connected, and a power gear (605) is meshed on the outer side of the toothed groove (603).

4. The detection device for optical lens according to claim 3, wherein: Both ends of the power gear (605) are rotatably connected to the upper end of the bracket plate and the column (601), and the output end of the power motor (604) is connected to the power gear (605) through the transmission structure. When the power motor (604) drives the power gear (605) to rotate, the ring bearing seat (6) is pushed up and down synchronously through the meshing of the tooth groove (603).

5. The detection device for an optical lens according to claim 4, characterized in that: The second rotary drive mechanism includes a second servo motor (8) fixedly mounted on the inner wall of the annular bearing seat (6), a third drive gear (801) fixedly mounted on the output end of the second servo motor (8), and a second driven gear ring (802) fixedly mounted on the inner wall of the inner sleeve (3). The third drive gear (801) and the second driven gear ring (802) are meshed together.

6. The detection device for optical lens according to claim 1, wherein: The clamping assembly includes thrust cylinders (301) arranged in a ring array. The fixed end of the thrust cylinder (301) is fixedly connected to the outer wall of the inner sleeve (3). The output end of the thrust cylinder (301) extends to the inner side of the inner sleeve (3) and is fixedly connected to an arc-shaped clamping plate (302). The inner curved surface of the arc-shaped clamping plate (302) fits the outer circumferential surface of the optical lens to be tested, and a flexible anti-slip pad is provided on the inner surface of the arc-shaped clamping plate (302).

7. The detection device for optical lens according to claim 1, wherein: The top of the outer sleeve (2) is closed with a top cover (5), and the detection camera (7) is installed on the upper part of the inner wall of the outer sleeve (2) through an adjustable mounting assembly.

8. The detection device for an optical lens according to claim 7, characterized in that: The adjustable mounting assembly includes an axial slide rail (701) fixedly mounted on the inner wall of the outer sleeve (2), a mounting slider (702) slidably mounted on the axial slide rail (701), and a locking member threaded onto the mounting slider (702). The locking member abuts against the axial slide rail (701) and is used to lock the position of the mounting slider (702). The detection camera (7) and the mounting slider (702) are fixedly connected, and the optical axis of the detection camera (7) is tilted vertically toward the concentric axis of the outer sleeve (2).

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