Lens testing device

Abstract

The utility model provides a lens testing arrangement, lens testing arrangement includes: workstation, sliding table, moving platform, extender, imaging module, lens and fixed bolster, sliding table is along first direction and workstation slip connection, moving platform is along first direction and sliding table slip connection, imaging module is installed on moving platform, lens is installed on imaging module, fixed bolster is fixed on moving platform, fixed bolster is located in the one side of lens away from imaging module, the extender with fixed bolster is detachable connection. The utility model's lens testing arrangement can be applicable to more working distance.

Description

Technical Field

[0001] This utility model relates to the field of lens testing technology, and in particular to a lens testing device. Background Technology

[0002] In the logistics industry, the working distance between the lens on the barcode reader and the surface being tested is generally between 1 meter and 3 meters. The specific working distance needs to be determined by the customer, and the corresponding test scenario needs to be set up manually.

[0003] If the current test distance—that is, the maximum relative distance that the current test scenario can provide between the lens and the surface under test—cannot meet the customer's required working distance, then a test scenario that meets the working distance needs to be manually rebuilt to test the lens sharpness. This is time-consuming and labor-intensive, reducing the efficiency of lens sharpness testing. Therefore, how to make the built test scenario applicable to more working distances without changing the test distance has become an urgent problem to be solved. Utility Model Content

[0004] To solve the above problems, the lens testing device provided by this utility model, by setting a teleconverter, can make the lens testing device applicable to more working distances without changing the testing distance.

[0005] This utility model provides a lens testing device, which includes: a worktable, a slide table, a moving table, a teleconverter, an imaging module, a lens, and a fixed bracket;

[0006] The slide table is slidably connected to the worktable along the first direction, the moving stage is slidably connected to the slide table along the first direction, the imaging module is mounted on the moving stage, the lens is mounted on the imaging module, the fixed bracket is fixed on the moving stage, the fixed bracket is located on the side of the lens away from the imaging module, and the teleconverter is detachably connected to the fixed bracket.

[0007] Optionally, the lens testing device further includes: a drive module;

[0008] One end of the drive module is connected to the slide table, and the drive module is used to drive the slide table to slide relative to the worktable in a first direction.

[0009] Optionally, the drive module includes: a power unit, a main pulley, a driven pulley, and a transmission belt;

[0010] The main pulley and the driven pulley are arranged along the first direction and are rotatably connected to the worktable. The transmission belt is sleeved on the outside of the main pulley and the driven pulley. The power unit is connected to the main pulley and is used to drive the main pulley to rotate relative to the worktable.

[0011] Optionally, the power assembly includes a handwheel connected to the main pulley, which is used to drive the main pulley to rotate relative to the worktable.

[0012] Optionally, both the main pulley and the driven pulley rotate along the worktable in a second direction, which is perpendicular to the first direction;

[0013] The power assembly also includes: a reversing reduction module, a handwheel connected to the main pulley via the reversing reduction module, a handwheel fixedly connected to the input end of the reversing reduction module along a third direction, an output end of the reversing reduction module fixedly connected to the main pulley along a second direction, and a fixed end of the reversing reduction module fixedly connected to the worktable, with the third direction being perpendicular to the first and second directions respectively.

[0014] Optionally, the movable stage is located above the slide table, and a first slide rail extending in a first direction is fixedly provided on the upper surface of the slide table, and the movable stage is slidably connected to the first slide rail.

[0015] Optionally, limiting members are fixedly provided at both ends of the first slide rail, and the moving stage is located between the two limiting members. The limiting members are used to limit the sliding range of the slide stage on the first slide rail.

[0016] Optionally, the lens testing apparatus may also include: a calibration plate;

[0017] The calibration plate is located on the side of the teleconverter away from the lens.

[0018] Optionally, the calibration plate is slidably connected to the worktable along the first direction.

[0019] Optionally, the lens testing device also includes casters;

[0020] The casters are connected to the workbench.

[0021] The lens testing device provided in this embodiment of the utility model has a slide table that can move relative to the worktable in a first direction, and a moving stage that can move relative to the slide table in the first direction. An imaging module for mounting the lens is mounted on the slide table, and a teleconverter is mounted on the moving stage. The relative distance between the teleconverter and the lens, as well as the relative distance between the lens and the test surface, can be flexibly adjusted. By adjusting the distance between the teleconverter and the lens, the imaging effect of the lens under different working distances and fields of view can be simulated. Thus, without changing the test distance, a larger working distance between the lens and the test surface can be met, thereby expanding the application scenarios for testing lens sharpness. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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.

[0023] Figure 1 This is a schematic structural diagram of a lens testing device according to an embodiment of this application;

[0024] Figure 2 for Figure 1 A partial sectional view taken at point A along the vertical front-back direction;

[0025] Figure 3 for Figure 1 A partial sectional view taken at point B along the vertical front-back direction.

[0026] 1. Workbench; 11. Base plate; 12. Support frame; 13. Second slide rail; 14. Support plate; 15. Mounting plate; 2. Slide table; 21. First slide rail; 3. Moving stage; 41. Imaging module; 42. Lens; 43. Fixed bracket; 44. Mounting bracket; 5. Drive module; 51. Power assembly; 511. Handwheel; 512. Reversing reduction module; 52. Main pulley; 53. Driven pulley; 54. Transmission belt; 61. Aluminum profile fixing frame; 62. Fixing block; 63. Angle bracket; 64. Limiting component; 71. Calibration plate; 72. Support base; 73. Universal wheel; 74. Connecting frame; 75. Support foot. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0030] It should be noted that when an element is referred to as "fixedly connected" to another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is referred to as being "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0032] First, the main technical terms involved in this embodiment will be explained:

[0033] Calibration Target: In applications such as machine vision and image measurement, this is an auxiliary test frame used to determine lens distortion and sharpness. In this case, a checkerboard pattern card is used.

[0034] Checkerboard pattern card: A high-precision pattern card composed of equal numbers of black and white squares. The clarity of the lens on the reader is determined by analyzing the transition area between the black and white squares.

[0035] Teleconverter: By adjusting the distance between the lens element and the lens, it simulates the imaging effect of the lens at different working distances and fields of view.

[0036] One embodiment of this utility model provides a lens testing device, see [link to relevant documentation]. Figure 1The lens testing device includes: a worktable 1, a slide table 2, a moving stage 3, a teleconverter, an imaging module 41, a lens 42, and a fixed bracket 43;

[0037] The slide 2 is slidably connected to the worktable 1 along the first direction, and the moving stage 3 is slidably connected to the slide 2 along the first direction. The imaging module 41 is mounted on the moving stage 3, the lens 42 is mounted on the imaging module 41, and the fixed bracket 43 is fixed on the moving stage 3. The fixed bracket 43 is located on the side of the lens 42 away from the imaging module 41. The teleconverter is detachably connected to the fixed bracket 43. The optical axis of the lens 42 coincides with the optical axis of the teleconverter. It is understandable that... Figure 1 The 43-hole structure on the fixed bracket is the location for installing the teleconverter.

[0038] The lens testing device provided in this embodiment, by setting a slide 2 that can move relative to the worktable 1 in a first direction on the worktable 1, and setting a moving stage 3 that can move relative to the slide 2 in the first direction on the slide 2, and simultaneously installing an imaging module 41 for mounting a lens 42 on the slide 2, and setting a teleconverter on the moving stage 3, can flexibly adjust the relative distance between the teleconverter and the lens 42, as well as the relative distance between the lens 42 and the surface to be tested. By adjusting the distance between the teleconverter and the lens 42, the imaging effect of the lens 42 under different working distances and fields of view can be simulated, thereby satisfying a larger working distance between the lens 42 and the surface to be tested without changing the test distance, thus expanding the application scenarios for testing the sharpness of the lens 42.

[0039] In this embodiment, the first direction is the left-right direction; the worktable 1, slide table 2, and moving table 3 are stacked sequentially from bottom to top; the imaging module 41, lens 42, and fixed bracket 43 are arranged sequentially from left to right; the imaging module 41 is a barcode reader.

[0040] The workbench 1 includes a base plate 11 and a support frame 12. The bottom of the support frame 12 is fixedly mounted on the upper surface of the base plate 11.

[0041] Furthermore, a second slide rail 13 extending in the left-right direction is fixedly installed on the top of the support frame 12. The slide table 2 is slidably connected to the second slide rail 13 via sliders fixed at both ends. A mounting bracket 44 for supporting the imaging module 41 and a first slide rail 21 extending in the left-right direction are fixedly installed on the upper surface of the slide table 2. The moving stage 3 is slidably connected to the first slide rail 21 via a slider fixed at its bottom. The moving stage 3 is located on the right side of the mounting bracket 44. The imaging module 41 is fixed to the mounting bracket 44 by the cooperation of the slider and screws. By adjusting the position of the imaging module 41 relative to the mounting bracket 44 in the vertical direction, when the optical axis of the lens 42 mounted on the imaging module 41 coincides with the optical axis of the teleconverter, the imaging module 41 and the lens 42 can be fixed by tightening the screws.

[0042] By setting the first slide rail 21 and the second slide rail 13, the positions of the slide table 2 and the moving stage 3 relative to the worktable 1 in the left-right direction can be stably adjusted, thereby allowing for precise adjustment of the distance between the lens 42 and the teleconverter and the surface to be measured. It is understood that the slide table 2 and the moving stage 3 can be driven manually or electrically. The manual driving method further includes the user directly pushing the slide table 2 and / or the moving stage 3 relative to the worktable 1 along the first direction, and the user using other mechanical modules to move the slide table 2 and / or the moving stage 3 relative to the worktable 1 along the first direction.

[0043] In a further optional embodiment of this invention, the lens testing device further includes a drive module 5. The drive module 5 is connected to the slide table 2. The drive module 5 is used to drive the slide table 2 to slide relative to the worktable 1 in a first direction. The drive module 5 can achieve the movement of the slide table 2 through a lead screw drive structure or a pulley drive structure.

[0044] Combination Figure 1 and Figure 2 A support plate 14 is fixedly mounted on the upper surface of the base plate 11, and a mounting plate 15 is fixedly mounted on the top of the support frame 12. The drive module 5 includes a power assembly 51, a main pulley 52, a driven pulley 53, and a transmission belt 54. The main pulley 52 and the driven pulley 53 are arranged along a first direction and are rotatably connected to the worktable 1 respectively. The transmission belt 54 is sleeved on the outside of the main pulley 52 and the driven pulley 53. The power assembly 51 is connected to the main pulley 52 and is used to drive the main pulley 52 to rotate relative to the worktable 1.

[0045] Both the main pulley 52 and the driven pulley 53 rotate relative to the worktable 1 along a second direction, which is perpendicular to the first direction.

[0046] In this embodiment, the main pulley 52 is rotatably connected to the support plate 14 in the front-to-back direction, and the secondary pulley 53 is rotatably connected to the mounting plate 15 in the front-to-back direction. An aluminum profile fixing frame 61 is fixedly installed at the bottom of the slide table 2, and the aluminum profile fixing frame 61 is fixedly connected to the transmission belt 54 through a fixing block 62. The fixing block 62 is fixedly connected to the transmission belt 54 by screws. Thus, by rotating the main pulley 52, the transmission belt 54 can drive the imaging module 41 and lens 42 on the slide table 2, as well as the teleconverter on the moving stage 3, to move in the left-to-right direction. The power assembly 51 can drive the main pulley 52 to rotate in both manual and electric drive modes.

[0047] Combined with the diagram Figure 1 and Figure 3Angle bracket 63 is provided at the lower end of the aluminum profile fixing bracket 61. One end of the angle bracket 63 is fixedly connected to the aluminum profile fixing bracket 61 by screws, and the other end of the angle bracket 63 is fixedly connected to the reinforcing block by screws. The angle bracket 63 increases the stability of the connection between the aluminum profile fixing bracket 61 and the fixing block 62.

[0048] In this embodiment, the power assembly 51 drives the main pulley 52 to rotate manually. Specifically, the power assembly 51 includes a handwheel 511. The handwheel 511 is connected to the main pulley 52 and is used to drive the main pulley 52 to rotate relative to the worktable 1.

[0049] The power assembly 51 also includes a reversing reduction module 512. The handwheel 511 is connected to the main pulley 52 via the reversing reduction module 512. The handwheel 511 is fixedly connected to the input end of the reversing reduction module 512 along a third direction. The output end of the reversing reduction module 512 is fixedly connected to the main pulley 52 along a second direction. The fixed end of the reversing reduction module 512 is fixedly connected to the worktable 1. The third direction is perpendicular to the first direction and the second direction, respectively.

[0050] It is understandable that the third direction refers to the forward and backward direction, and the reversing reduction module 512 is located in front of the main pulley 52. ​​The core component of the reversing reduction module 512 is two sets of orthogonally meshing spiral bevel gears, which achieve a 90° power reversal between the input shaft and the output shaft through a cross-shaped arrangement. The input shaft is the input end of the reversing reduction module 512 and is fixedly connected to the handwheel 511; the output shaft is the output end of the reversing reduction module 512 and is fixedly connected to the main pulley 52 coaxially; the number of teeth of the spiral bevel gear connected to the input shaft is less than the number of teeth of the spiral bevel gear connected to the output shaft; the fixed end of the reversing reduction module 512 is the housing of the reversing reduction module 512 and is fixedly connected to the support plate 14.

[0051] Furthermore, limiting members 64 are fixedly provided at both ends of the first slide rail 21. The moving stage 3 is located between the two limiting members 64. The limiting members 64 are used to limit the sliding range of the sliding stage 2 on the first slide rail 21. Among them, the limiting member 64 closer to the lens 42 is 4 cm to 8 cm away from the end of the lens 42 away from the imaging module 41, preferably 5 cm. The other limiting member 64 is 8 cm to 15 cm away from the end of the lens 42 away from the imaging module 41, preferably 12 cm. The length of the moving stage 3 in the left-right direction is 1 cm to 3 cm, preferably 2 cm.

[0052] It is understood that the surface to be tested can be set on the workbench 1 or on the outside of the workbench 1. In this embodiment, the lens testing device further includes a calibration plate 71. The calibration plate 71 is located on the side of the teleconverter away from the lens 42.

[0053] Furthermore, a support base 72 is also installed on the top of the support frame 12. The support base 72 is located on the side of the teleconverter away from the lens 42. The calibration plate 71 is fixed on the support base 72, and the calibration plate 71 is perpendicular to the optical axis of the teleconverter. In this embodiment, the support base 72 is slidably connected to the second slide rail 13 in the left-right direction by a slider, so that the distance between the lens 42 and the calibration plate 71 can be flexibly adjusted.

[0054] The lens testing device also includes casters 73. The casters 73 are mounted at the four corners below the base plate 11 via connecting brackets 74. One end of the connecting bracket 74 is fixedly connected to the base plate 11, and the other end of the connecting bracket 74 is pivotally connected to the casters 73.

[0055] The lens testing device also includes support feet 75. Support feet 75 are also installed at the four corners below the base plate 11. Support feet 75 are threadedly connected to the base plate 11. When the worktable 1 needs to be moved, the support feet 75 are turned upwards to lift them off the ground, allowing the worktable 1 to be moved via the casters 73. When the worktable 1 is stationary, the support feet 75 are turned downwards to lift them off the ground, at which point the four support feet 75 provide support for the worktable 1, securing it in place.

[0056] In this embodiment, when the maximum distance between lens 42 and calibration plate 71 is insufficient to achieve the required test distance for clear imaging of lens 42, a teleconverter is installed on the fixed bracket 43. The distance between the teleconverter and lens 42 is adjusted by moving the stage 3, ensuring that the distance at which lens 42 can image the calibration plate 71 meets the test requirements. Finally, the clarity of lens 42 is tested using barcode reader testing software. After the test, the original lens 42 is removed and replaced with a new lens 42. The barcode reader testing software is then used to continue testing the new lens 42. This process is repeated until all lenses 42 are tested.

[0057] The lens testing device provided in this embodiment has a simple structure and is easy to operate. It can flexibly adjust the distance between the lens 42, the teleconverter and the calibration plate 71, and is particularly suitable for testing sites with limited space.

[0058] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A lens testing device, characterized in that, The lens testing device includes: a worktable, a slide table, a moving stage, a teleconverter, an imaging module, a lens, and a fixed bracket; The slide is slidably connected to the worktable along the first direction, the moving stage is slidably connected to the slide along the first direction, the imaging module is mounted on the moving stage, the lens is mounted on the imaging module, the fixed bracket is fixed on the moving stage, the fixed bracket is located on the side of the lens away from the imaging module, and the teleconverter is detachably connected to the fixed bracket.

2. The lens testing device according to claim 1, characterized in that, The lens testing device also includes: a drive module; One end of the drive module is connected to the slide table, and the drive module is used to drive the slide table to slide relative to the worktable along the first direction.

3. The lens testing device according to claim 2, characterized in that, The drive module includes a power component, a main pulley, a driven pulley, and a transmission belt; the main pulley and the driven pulley are arranged along the first direction and are rotatably connected to the worktable respectively; the transmission belt is sleeved on the outside of the main pulley and the driven pulley; the power component is connected to the main pulley and is used to drive the main pulley to rotate relative to the worktable.

4. The lens testing device according to claim 3, characterized in that, The power assembly includes a handwheel connected to the main pulley, which is used to drive the main pulley to rotate relative to the worktable.

5. The lens testing apparatus according to claim 4, characterized in that, Both the main pulley and the driven pulley rotate relative to the worktable along a second direction, which is perpendicular to the first direction. The power assembly further includes: a reversing reduction module, the handwheel is connected to the main pulley through the reversing reduction module, the handwheel is fixedly connected to the input end of the reversing reduction module along a third direction, the output end of the reversing reduction module is fixedly connected to the main pulley along a second direction, the fixed end of the reversing reduction module is fixedly connected to the worktable, and the third direction is perpendicular to the first direction and the second direction respectively.

6. The lens testing apparatus according to claim 1, characterized in that, The movable platform is located above the slide table, and a first slide rail extending along the first direction is fixedly provided on the upper surface of the slide table. The movable platform is slidably connected to the first slide rail.

7. The lens testing apparatus according to claim 6, characterized in that, Limiting members are fixedly provided at both ends of the first slide rail, and the moving stage is located between the two limiting members. The limiting members are used to limit the sliding range of the slide stage on the first slide rail.

8. The lens testing apparatus according to claim 1, characterized in that, The lens testing device also includes: a calibration plate; The calibration plate is located on the side of the fixed bracket opposite to the lens.

9. The lens testing apparatus according to claim 8, characterized in that, The calibration plate is slidably connected to the worktable along the first direction.

10. The lens testing apparatus according to any one of claims 1 to 9, characterized in that, The lens testing device also includes universal wheels; The casters are movably connected to the worktable.

Images