Polishing and correcting platform for industrial lens test and adjusting method of polishing and correcting platform

Abstract

The invention provides a lighting and correcting platform for industrial lens testing and an adjusting method thereof, and belongs to the technical field of automation equipment, the lighting and correcting platform comprises an optical platform, a rotating module, first Z-direction adjustable modules, first Y-direction adjustable modules and a second Y-direction adjustable module, and the output ends of the first Y-direction adjustable modules on the two sides are connected with the first Z-direction adjustable modules; a rotating module is mounted at the output end of the first Z-direction adjustable module; light source devices are mounted on the rotating modules, and the number of the light source devices, the number of the first Z-direction adjustable modules and the number of the rotating modules are all two; a backlight plate is arranged below the light source device, the backlight plate is installed on an optical platform through a second Y-direction adjustable module, a support is fixedly installed on the optical platform, a lens is movably installed on the support, and the test platform can automatically operate and adjust to reach a set value according to set RGB illuminance during debugging and lighting. The working efficiency can be improved, the mechanical structure is simple, the manufacturing cost is low, and the cost performance is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of automation equipment, and specifically relates to a lighting and correction platform for industrial lens testing and its adjustment method. Background Art

[0002] Currently, the common lighting method of platforms for testing the performance of industrial lenses on the market is mainly to manually debug the angle and the up-down, front-back directions of the light source device according to visually observing the RGB values. This method is time-consuming and labor-intensive. Additionally, when adjusting the parallelism between the lens end face and the photographed platform, physical methods are also used for correction when adjusting the tilt parallelism. Specifically, a cuboid with relatively parallel upper and lower ends is taken and placed under the lens. The upper part of the cuboid contacts the lens end face, and the lower part of the cuboid is placed on the backlight board of the moving platform. At this time, a 0.5-mm thin paper sheet is placed between the lens end face and the upper end face of the rectangle, and then the camera fixing screws are manually tightened and loosened to adjust the interval between the lens end face and the upper end face of the rectangle. When the 0.5-mm thin paper sheet cannot be pulled out, the parallelism is considered okay.

[0003] The above manual adjustment actions are very time-consuming, especially when there are strict requirements for the RGB light intensity in the lighting environment of the object to be measured and for ensuring the parallelism between the object to be measured and the lens. The manual debugging time will be even more time-consuming. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the embodiments of the present invention is to provide a lighting and correction platform for industrial lens testing.

[0005] To solve the above technical problem, the present invention provides the following technical solution: A lighting and correction platform for industrial lens testing, including an optical platform, a rotation module, a first Z-direction adjustable module, a first Y-direction adjustable module, and a second Y-direction adjustable module. The first Y-direction adjustable modules are installed on both sides of the optical platform, and the output ends of the first Y-direction adjustable modules on both sides are connected to the first Z-direction adjustable module. The first Y-direction adjustable module is used to drive the first Z-direction adjustable module to move in the Y direction;

[0006] The output end of the first Z-direction adjustable module is installed with a rotation module. The first Z-direction adjustable module is used to drive the rotation module to move in the Z direction;

[0007] A light source device is installed on the rotation module. The rotation module is used to drive the light source device to rotate. The light source device, the first Z-direction adjustable module, and the rotation module are all provided with two groups;

[0008] A backlight panel is provided below the light source device. The backlight panel is installed on the optical platform through a second Y-direction adjustable module. A bracket is fixedly installed on the optical platform, and a lens is movably installed on the bracket. The second Y-direction adjustable module is used to drive the backlight panel to move in the Y direction.

[0009] As a further improvement: A second Z-direction adjustable module is installed on the bracket. The output end of the second Z-direction adjustable module is connected to an angle adjustment module, and the output end of the angle adjustment module is connected to a lens.

[0010] As a further improvement: The angle adjustment module has X-direction and Y-direction adjustment rotations.

[0011] As a further improvement: A Y-direction support structure is also installed between the backlight panel and the optical platform. The Y-direction support structure is used to guide the movement of the backlight panel.

[0012] As a further improvement: Both the first Y-direction adjustable module and the second Z-direction adjustable module are fixedly connected to the optical platform through a plurality of uniformly arranged bolts.

[0013] The present invention also provides an adjustment method for a lighting and correction platform for industrial lens testing. The method includes a lighting and correction platform for industrial lens testing. The method is specifically as follows:

[0014] Based on the estimated distance data and lens parameters, respectively adjust the positions of the two light source devices, as well as the magnification and focal length of the lens;

[0015] Determine the required RGB illuminance value and read the initial RGB illuminance value;

[0016] Based on the initial RGB illuminance value and the required RGB illuminance value, control the first Y-direction adjustable module, the first Z-direction adjustable module, and the rotation module to adjust the positions of the two groups of light source devices until the required RGB illuminance value is reached;

[0017] Place the calibration block on the backlight panel, control the shooting and obtain the calibration image;

[0018] Read the transition pixels of the calibration image, and based on the transition pixels, control the angle adjustment module until the transition pixels reach the minimum value.

[0019] As a further improvement: The calibration image includes images of the four sides of the calibration block.

[0020] As a further improvement: Between the step of placing the calibration block on the backlight panel and the step of controlling the shooting and obtaining the calibration image, it further includes: Adjust the lens to the calibration working position through the second Z-direction adjustable module.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: When debugging the lighting, this test platform can automatically run and adjust to reach the set value according to the set RGB illuminance.

[0022] This device can operate fully automatically, improving work efficiency. Moreover, its mechanical structure is simple and the cost is low, with high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a lighting and correction platform for industrial lens testing;

[0024] Figure 2 It is a schematic diagram of the connection structure of the light source device of a lighting and correction platform for industrial lens testing;

[0025] Figure 3 It is a schematic diagram of the connection structure of the backlight board of a lighting and correction platform for industrial lens testing;

[0026] Figure 4 It is a schematic diagram of the camera fixing structure of a lighting and correction platform for industrial lens testing;

[0027] Figure 5 It is a schematic diagram of the angle adjustment module structure of a lighting and correction platform for industrial lens testing;

[0028] Figure 6 It is the transition pixel of a lighting and correction platform for industrial lens testing Figure 1 ;

[0029] Figure 7 It is the transition pixel of a lighting and correction platform for industrial lens testing Figure 2 ;

[0030] In the figure: 1. Optical platform; 2. Bracket; 3. Computer; 4. Control electric box; 5. Rotation module; 6. First Z-direction adjustable module; 7. First Y-direction adjustable module; 8. Light source device; 9. Second Y-direction support structure; 10. Second Y-direction adjustable module; 11. Backlight board; 12. Second Z-direction adjustable module; 13. Angle adjustment module; 14. Fixed plate; 15. Camera. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions of the present application will be further described in detail below in conjunction with the specific embodiments.

[0032] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0033] Please refer to Figures 1 to 5 , in one embodiment, a lighting and correction platform for industrial lens testing, characterized in that it includes an optical platform, a rotation module, a first Z-direction adjustable module, a first Y-direction adjustable module and a second Y-direction adjustable module. The first Y-direction adjustable modules are installed on both sides of the optical platform, and the output ends of the first Y-direction adjustable modules on both sides are connected to the first Z-direction adjustable module. The first Y-direction adjustable module is used to drive the first Z-direction adjustable module to move in the Y direction;

[0034] The output end of the first Z-direction adjustable module is installed with a rotation module. The first Z-direction adjustable module is used to drive the rotation module to move in the Z direction;

[0035] A light source is installed on the rotation module. The rotation module is used to drive the light source to rotate. There are two sets of the light source, the first Z-direction adjustable module and the rotation module;

[0036] A backlight plate is arranged below the light source. The backlight plate is installed on the optical platform through the second Y-direction adjustable module. A bracket is fixedly installed on the optical platform, and a lens is movably installed on the bracket. The second Y-direction adjustable module is used to drive the backlight plate to move in the Y direction, and the backlight plate is used for backlight photography.

[0037] In this embodiment, the first Y-direction adjustable module includes two stepper motors and a slide table. The two slide tables are controlled by two stepper motors at different distances. The slide table is fixedly connected to the first Z-direction adjustable module. The stepper motor drives the slide to move through a lead screw. The two lead screws share a linear guide rail with a stroke of 1000 mm. The up and down movement stroke of the first Z-direction adjustable module is 500 mm. The stepper motors of the two sets of rotation modules are fixed on two Z-axis slide tables. The Z-axis slide table is connected to the output end of the first Z-direction adjustable module to drive the light source to cooperate with the PLC for automatic lighting. The rotation center axis of the rotation module is in the X-axis direction.

[0038] The second Y-direction adjustable module is driven by an ultra-precision servo motor with a stroke of 1000 mm and a parallelism accuracy of 0.005 mm during operation, and can realize the forward and backward movement of the measured platform.

[0039] The second Y-direction adjustable module, the first Y-direction adjustable module, the first Z-direction adjustable module, and the rotation module are set centered on the camera lens. The first Y-direction adjustable module, the first Z-direction adjustable module, and the rotation module on one side are located 600 mm to the left centered on the camera lens.

[0040] Please refer to Figure 1 、 Figure 4 and Figure 5 In one embodiment, a second Z-direction adjustable module is installed on the bracket. The output end of the second Z-direction adjustable module is connected to an angle adjustment module, and the output end of the angle adjustment module is connected to a lens.

[0041] In this embodiment, the second Z-direction adjustable module is driven by an ultra-precision servo motor with a stroke of 1500 mm and a parallelism accuracy of 0.005 mm during operation. It realizes driving the camera to move vertically up and down;

[0042] The bracket is made of marble material, which can play a role in shock absorption.

[0043] Please refer to Figure 1 、 Figure 4 and Figure 5 In one embodiment, the angle adjustment module has X-direction and Y-direction adjustment rotations.

[0044] In this embodiment, the angle adjustment module is driven by an ultra-precision servo motor with an inclination angle of ±15° and an accuracy of 0.002°. It realizes driving the camera lens to automatically adjust the parallelism in cooperation with the PLC controller.

[0045] The stepper motors of the first Y-direction adjustable modules, the first Z-direction adjustable modules, and the rotation modules on both sides are connected to each other through cables. The stepper motors are connected to the PLC controller through cables, and the PLC controller computer host is connected through cables. The ultra-precision servo motors of the second Z-direction adjustable module, the angle adjustment module, and the second Y-direction adjustable module are connected through cables. The servo driver is connected to the PLC controller through cables. The PLC controller is connected to the computer host. All the ultra-precision servo motors are electrically connected to the servo controller.

[0046] It further includes a control electric box, and the servo controller and the PLC controller are installed in the control electric box.

[0047] Please refer to Figure 3 In one embodiment, a Y-direction support structure is further installed between the backlight board and the optical platform, and the Y-direction support structure is used to guide the movement of the backlight board.

[0048] In one embodiment, both the first Y-direction adjustable module and the second Z-direction adjustable module are fixedly connected to the optical platform through a plurality of uniformly arranged bolts.

[0049] In this embodiment, the optical platform is 1.8*1.5 meters in size and is provided with M5 screw fixing positions at 50 intervals, which allows for flexible adjustment of the spacing distances of other characteristic structures. This optical platform also has a shockproof effect.

[0050] The working process of the present invention is as follows: turn on the power of the equipment, fix the camera, install the measured lens, open the camera shooting software, use the computer host to control the second Z-axis adjustable module to move up and down to the corresponding working distance, adjust the corresponding magnification and focus of the lens parameters by manually twisting the lens focus ring, use the industrial lens to shoot the RGB illuminance value displayed in real time by the shooting software, read the real-time value, and then enter the required value on the external software. The PLC controller reads the corresponding command and will control the first Y-axis adjustable module, the first Z-axis adjustable module and the rotating module according to the previously written command to drive the two groups of light sources to automatically adjust until the required value is reached. If the RGB illuminance value is too large, first use the first Y-axis adjustable module to move the light source in the "forward and backward" direction to determine whether the required value is reached, and retain the distance closest to the required value. If the set RGB value is not reached, the first Z-adjustable module will automatically move up and down to determine whether the required value is reached and retain the distance closest to the required value. If the set RGB value is not reached, the rotation module will automatically move the "rotation" angle to determine whether the required value is reached. At this time, after the automatic adjustment of the three axes, the RGB value we set can basically be achieved. After the first step of automatic lighting is completed, take the correction block and place it on the backlight board just below the lens. The correction block size is 50 length * 50 width * 10 height, and the accuracy of the parallelism of the top, bottom, left, right, front and back is 0.001mm. Manually enter the value to control the second Z-adjustable module to drive the angle adjustment module and the camera lens to the appropriate working distance, and adjust the lens to the corresponding magnification and focus clearly. When the camera shoots the correction image below, transition pixels will appear. Figure 6 The external software will pass information to the PLC controller by reading the number of transition pixels on the four sides of the correction block. The fewer and more uniform the transition pixels are, the higher the parallelism is. The PLC controls the angle adjustment module through the relevant instructions set before, driving the camera and lens to rotate together, and adjust to a uniform transition pixel number of only 1 to 2. The size of a pixel is usually between 2-5um, such as Figure 7 At this time, we can assume that the parallelism between the lens end face and the moving platform of the object to be measured is within 0.005mm, achieving the purpose of adjusting the lens to be parallel to the backlight surface of the moving platform. After actual shooting, it is found that if the lens is tilted to the left, the picture taken from the left side of the correction block will be blurred on the left due to excessive transition pixels. After the parallelism is adjusted, the pixels on the four sides will be more uniform, and the number of transition pixels will be only 1~2.

[0051] The lens data tested by this multi-functional lens performance test platform is accurate, and it achieves unified control and management of data during the pre-correction automatic operation, and the records are queryable.

[0052] This test platform can achieve fully automatic adjustment during the pre-calibration operation, automatically adjust according to the designed required values, reduce the operation time, and improve the accuracy and precision.

[0053] This test platform does not require operators with debugging experience. Just input the set values of the corresponding requirements, and it can automatically debug. The operation is simple and the work efficiency is improved.

[0054] This test platform has a simple mechanical structure and can take into account the different performances of various lenses (such as common resolution, gray value, distortion, relative illuminance, field of view, magnification, actual shooting test, etc.). Most of the module standard parts can be purchased online, and the spare parts can be designed and processed by oneself with relatively low difficulty. The overall cost is low, and it can meet the performance tests of most industrial lenses.

[0055] A test platform that takes into account multiple industrial lenses, full-automatic lighting, and automatic parallelism correction is suitable for the performance tests of different lens models, especially for those with high requirements for the lighting environment and high requirements for the parallelism between the lens end face and the photographed object.

[0056] The present invention also provides an adjustment method for a lighting and correction platform for industrial lens testing. The method includes a lighting and correction platform for industrial lens testing, and the method is specifically as follows:

[0057] Based on the estimated distance data and lens parameters, respectively adjust the positions of the two light sources, as well as the magnification and focal length of the lens;

[0058] Determine the required RGB illuminance value and read the initial RGB illuminance value;

[0059] Based on the initial RGB illuminance value and the required RGB illuminance value, control the first Y-direction adjustable module, the first Z-direction adjustable module, and the rotation module to adjust the positions of the two groups of light sources until the required RGB illuminance value is reached;

[0060] Place the calibration block on the backlight board, control the shooting and obtain the calibration image;

[0061] Read the transition pixels of the calibration image, and based on the transition pixels, control the angle adjustment module until the transition pixels reach the minimum value.

[0062] Use the computer host to control the up and down movement of the second Z-direction adjustable module to adjust to the corresponding working distance. By manually turning the lens focusing ring, adjust the corresponding magnification and focusing of the lens parameters. During the shooting process with the industrial lens, the RGB illuminance value displayed in real time by the shooting software is read, and the real-time value is read. Then, input the required value on the external software. When the PLC controller reads the corresponding command, it will control the first Y-direction adjustable module, the first Z-direction adjustable module, and the rotation module to drive the two light sources to automatically adjust according to the previously written commands until the required value is reached. If the RGB illuminance value is too large, the first Y-direction adjustable module will drive the light source to move in the "front and back" direction to judge whether the required value is reached, and retain the distance closest to the required value. If the set RGB value cannot be reached, the first Z-direction adjustable module will move "up and down" automatically to judge whether the required value is reached, and retain the distance closest to the required value. If the set RGB value cannot be reached, the rotation module will move automatically at an "angle" to judge whether the required value is reached. At this time, after the automatic adjustment of the three axes, the set RGB value can basically be reached. After the first step of the automatic lighting is completed, take the calibration block and place it on the backlight board directly below the lens. The size of the calibration block is 50 in length * 50 in width * 10 in height, and the parallelism of the precision in the up and down, left and right, front and back directions is within 0.001 mm. Manually input the value to control the second Z-direction adjustable module to drive the angle adjustment module and the camera lens to adjust to the appropriate working distance, and adjust the lens to the corresponding magnification and focus clearly. When the camera shoots the calibration image below, there will be transitional pixels. The external software will transmit information to the PLC controller by reading the number of transitional pixels in the four sides of the calibration block. The fewer and more uniform the transitional pixels, the higher the parallelism. The PLC controls the angle adjustment module through the previously set relevant instructions to drive the camera and the lens to rotate together until it is uniform and the number of transitional pixels is only 1 to 2.

[0063] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0064] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lighting and correction platform for industrial lens testing, characterized in that, It includes an optical platform, a rotation module, a first Z-direction adjustable module, a first Y-direction adjustable module, and a second Y-direction adjustable module. The first Y-direction adjustable modules are installed on both sides of the optical platform. The output ends of the first Y-direction adjustable modules on both sides are connected to the first Z-direction adjustable module. The first Y-direction adjustable module is used to drive the first Z-direction adjustable module to move in the Y direction; The output end of the first Z-direction adjustable module is installed with a rotation module. The first Z-direction adjustable module is used to drive the rotation module to move in the Z direction; A light source is installed on the rotation module. The rotation module is used to drive the light source to rotate. There are two sets of the light source, the first Z-direction adjustable module, and the rotation module; A backlight board is arranged below the light source. The backlight board is installed on the optical platform through the second Y-direction adjustable module. A bracket is fixedly installed on the optical platform. A lens is movably installed on the bracket. The second Y-direction adjustable module is used to drive the backlight board to move in the Y direction.

2. The lighting and correction platform for industrial lens testing according to claim 1, characterized in that, A second Z-direction adjustable module is installed on the bracket. The output end of the second Z-direction adjustable module is connected to an angle adjustment module. The output end of the angle adjustment module is connected to a lens.

3. The lighting and correction platform for industrial lens testing according to claim 2, characterized in that, The angle adjustment module has X-direction and Y-direction adjustment rotations.

4. A lighting and correction platform for industrial lens testing according to claim 1, characterized in that, A Y-direction support structure is also installed between the backlight board and the optical platform. The Y-direction support structure is used to guide the movement of the backlight board.

5. The lighting and correction platform for industrial lens testing according to claim 4, characterized in that, The first Y-direction adjustable module and the second Z-direction adjustable module are both fixedly connected to the optical platform through a number of uniformly arranged bolts.

6. An adjustment method for a lighting and correction platform for industrial lens testing, characterized in that, The method includes a lighting and correction platform for industrial lens testing as described in any one of claims 1-5. The method is specifically as follows: Based on the estimated distance data and lens parameters, respectively adjust the positions of the two light sources and the magnification and focal length of the lens; Determine the required RGB illuminance value and read the initial RGB illuminance value; Based on the initial RGB illuminance value and the required RGB illuminance value, control the first Y-direction adjustable module, the first Z-direction adjustable module, and the rotation module to adjust the positions of the two sets of light sources until the required RGB illuminance value is reached; Place the calibration block on the backlight board, control the shooting and obtain the calibration image; Read the transition pixels of the calibration image, and based on the transition pixels, control the angle adjustment module until the transition pixels reach the minimum value.

7. The adjustment method of a lighting and correction platform for industrial lens testing according to claim 6, characterized in that, The calibration image includes the images of the four sides of the calibration block.

8. The adjustment method of a lighting and correction platform for industrial lens testing according to claim 6, characterized in that, Between the step of placing the calibration block on the backlight board and the step of controlling the shooting and obtaining the calibration image, it further includes: adjusting the lens to the calibration working position through the second Z-direction adjustable module.

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