An image quality detection device for a lens

Abstract

This application relates to the field of optical component inspection, and provides an image quality inspection device for lenses. The device includes a first fixed base with an image collector mounted on it; a second fixed base located on the light-inlet side of the image collector and including a lens mount and a lens adjustment mount, the lens mount supporting the lens under test and being adjusted to move closer to or further away from the image collector by the lens adjustment mount; and a third fixed base located on the side of the second fixed base opposite to the first fixed base and including an image source support and an image source adjustment mount, the image source support having an image source component mounted on it and being adjusted to move closer to or further away from the second fixed base by the image source adjustment mount. The image source component forms a test image through the lens under test, and the image collector receives the test image. This solves the problem in the prior art where the distance between the lens under test and the inspection camera is inconvenient to adjust, leading to inaccurate detection of the image quality indicators of the lens under test.

Description

Technical Field

[0001] This application relates to the field of optical lens inspection technology, and more specifically, to an image quality inspection device for lenses. Background Technology

[0002] Optical lenses typically undergo image quality testing before leaving the factory to determine if their quality meets factory requirements. Current image quality testing processes usually involve connecting a testing camera to the lens under test, photographing the black-and-white boundary line on a colorimetric plate using the lens, and then analyzing the width of the boundary line in the image captured by the testing camera to determine the image quality index.

[0003] Existing lenses under test are usually docked at the rear end of the test camera. However, for some lenses under test with size requirements for imaging distance, the distance between the lens under test and the test camera is inconvenient to adjust, which causes the imaging position of the lens under test to be outside the shooting position of the test camera. Therefore, the image obtained by the test camera cannot accurately reflect the image quality index of the lens, resulting in inaccurate testing.

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

[0005] The purpose of this application is to provide an image quality testing device for lenses, which solves the problem in the prior art that the distance between the lens under test and the testing camera is inconvenient to adjust, resulting in inaccurate detection of the image quality indicators of the lens under test.

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

[0007] This application provides an image quality detection device for a lens, comprising: a first fixing base, on which an image collector is disposed;

[0008] The second fixing seat is located on the light-inlet side of the image collector and includes a lens mount and a lens adjustment mount. The lens mount is used to support the lens under test and can be moved closer to or further away from the image collector by adjusting the lens adjustment mount.

[0009] The third fixing seat is located on the side of the second fixing seat away from the first fixing seat, and includes an image source carrier and an image source adjustment seat. The image source carrier is provided with an image source component, which moves closer to or further away from the second fixing seat by adjustment of the image source adjustment seat.

[0010] The image source forms a detection image through the lens under test, and the image collector is used to receive the detection image.

[0011] In an optional embodiment, the image source includes: a backlight panel, which is vertically mounted on the source carrier and is used to emit background light toward the lens under test;

[0012] The reticle is positioned on the light-emitting side of the backlight panel.

[0013] In an optional embodiment, the image source carrier includes: an image source carrier base plate, which is horizontally disposed on the image source adjustment seat;

[0014] The card insertion block is set on the image source carrier base plate. The card insertion block has an upward-facing slot, and the backlight plate is inserted into the slot.

[0015] In an optional embodiment, the image source adjustment mount includes an X-axis linear displacement stage, and the image source support is disposed on the X-axis linear displacement stage, and the image source component is driven to move closer to or away from the lens under test by the X-axis linear displacement stage.

[0016] In an optional embodiment, the lens mount includes: a lens support plate, which is fixedly mounted on the lens adjustment mount;

[0017] A lifting platform is set on the side of the lens support plate facing the first or third fixing seat;

[0018] The upper surface of the lifting platform can form a supporting step with the upper surface of the lens carrier plate to support both ends of the lens under test.

[0019] In an optional embodiment, the lifting platform is adjustablely mounted on the lens carrier plate via a lifting assembly so that the upper surface of the lifting platform is flush with or forms a height difference with the upper surface of the lens carrier plate.

[0020] The lifting assembly includes: a lifting screw, which is screwed onto the lens support plate, and a T-shaped head is provided at the upper end of the lifting screw, which is rotatably positioned inside the lifting platform;

[0021] The guide post is set on the raised platform and is movably mounted on the lens support plate.

[0022] In an optional embodiment, the lens carrier plate further includes a limiting component for limiting the movement of the lens under test in the left-right direction.

[0023] In an optional embodiment, the lens adjustment mount includes an XY-axis linear displacement stage, the lens mount is disposed on the XY-axis linear displacement stage, and the lens under test is moved by driving the XY-axis linear displacement stage.

[0024] In an optional embodiment, the first fixing base includes: a raised platform that extends a predetermined length in the height direction;

[0025] The camera mounting platform is attached to the raised platform, and the image collector is fixed to the camera mounting platform with screws.

[0026] In an optional embodiment, the image quality inspection device for the lens further includes a base plate, on which the first fixing seat, the second fixing seat, and the third fixing seat are all disposed.

[0027] The beneficial effects of the image quality testing device for lenses provided in this application are at least as follows: A first fixed base, a second fixed base, and a third fixed base are arranged sequentially at intervals along the X-axis. An image collector is disposed on the first fixed base, the lens to be tested is carried on the second fixed base, and an image source component is disposed on the third fixed base, thereby arranging the image source component, the lens to be tested, and the image collector sequentially along the X-axis. Furthermore, the lens mount carrying the lens to be tested can be adjusted closer to or further away from the image collector by adjusting the lens adjustment seat, thus achieving distance adjustment between the image collector and the lens to be tested; the image source carrier with the image source component can be adjusted closer to or further away from the second fixed base by adjusting the image source adjustment seat, thus achieving distance adjustment between the image source component and the lens to be tested. In this way, in the X-axis, the image source component forms a test image through the lens to be tested, the image collector receives the test image, and the test image is then analyzed by a computer to detect image quality indicators. In this solution, the distance between the image collector and the lens under test can be adjusted according to the testing requirements of the lens under test, and the distance between the image source and the lens under test can also be adjusted according to the testing requirements of the lens under test. This facilitates the image quality testing of different lenses under test, and adjusting the distance according to the lens barrel requirements also improves the accuracy of the image quality index testing of the lens under test. Attached Figure Description

[0028] 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.

[0029] Figure 1 A schematic diagram of the structure of an image quality detection device for a lens provided in an embodiment of this application;

[0030] Figure 2 An exploded view of a third fixing base and an image source component for an image quality detection device for a lens, provided in an embodiment of this application;

[0031] Figure 3 A schematic diagram of the first structure of a second fixing base for an image quality detection device for a lens provided in this application embodiment during use;

[0032] Figure 4 A schematic diagram of the second structure of a second fixing base for an image quality detection device for a lens, provided in an embodiment of this application, during use;

[0033] Figure 5 A cross-sectional view of a second structure of a second mounting base for an image quality testing device for a lens, provided in an embodiment of this application, in use;

[0034] Figure 6 A partial cross-sectional view of a second structure of a second fixing base for an image quality detection device for a lens, provided in an embodiment of this application, during use;

[0035] Figure 7 An exploded view of a first mounting base for an image quality testing device for a lens, provided in an embodiment of this application.

[0036] The following are the labeling elements in the figure:

[0037] 10. Lens under test; 100. First mounting base; 110. Elevation platform; 120. Camera connecting platform; 200. Image collector; 300. Second mounting base; 310. Lens mount; 311. Lens support plate; 312. Recessed opening; 313. Lifting platform; 320. Lens adjustment mount; 321. XY linear displacement stage; 330. Lifting assembly; 331. Lifting screw; 332. T-head; 333. Guide post 340. Limiting component; 341. L-shaped stop; 342. Waist-shaped hole; 343. Stop screw; 400. Third fixing seat; 410. Image source carrier; 411. Image source carrier base plate; 412. Insert block; 413. Insertion port; 414. Lamp board locking screw; 420. Image source adjustment seat; 421. X-axis linear displacement stage; 500. Image source component; 510. Backlight plate; 520. Reticle; 600. Base plate. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] like Figure 1 As shown, this embodiment proposes an image quality testing device for lenses, used to test the image quality indicators of a lens 10 under test, which can be various optical lenses. For ease of structural description, the X-direction is taken as the axis of the lens 10 under test for detailed explanation. The X-direction is also the front-to-back direction. The direction perpendicular to the X-direction on the horizontal plane is the Y-direction, which is also the left-to-right direction. During testing, the lens 10 under test is positioned along the X-direction on this image quality testing device.

[0041] like Figure 1 As shown, the image quality detection device in this embodiment mainly includes: a first fixing base 100, an image collector 200, a second fixing base 300, a third fixing base 400, and an image source component 500. An image collector 200 is mounted on a first fixed base 100, which elevates the image collector 200 to the central axis height of the lens under test 10. The lens under test 10 is mounted on a second fixed base 300, and the image source element 500 is mounted on a third fixed base 400. This arrangement, with the image collector 200, the lens under test 10, and the image source element 500 spaced apart from back to front, places the image source element 500 in front of the lens under test and the image collector 200 behind it. The image collector 200 captures the image of the image source element 500 within the lens under test 10, thus obtaining a test image. The image collector 200 is connected to an image quality analysis system on a computer via a data cable to analyze the image quality of the test image captured by the image collector 200. The image quality analysis system on the computer is existing technology and will not be described in detail.

[0042] like Figure 1As shown, in this embodiment, the second fixing base 300 is disposed on the light-inlet side (front side) of the image collector 200. The second fixing base 300 includes a lens mount 310 and a lens adjustment mount 320. The lens mount 310 is used to support the lens 10 under test and is adjusted to move closer to or further away from the image collector 200 by adjusting the lens adjustment mount 320. The third fixing base 400 is disposed on the front side of the second fixing base 300 and includes an image source carrier 410 and an image source adjustment mount 420. The image source component 500 is disposed on the image source carrier 410 and is adjusted to move closer to or further away from the second fixing base 300 by adjusting the image source adjustment mount 420. The first fixing base 100, the second fixing base 300 and the third fixing base 400 are arranged sequentially at intervals in the X direction. An image collector 200 is provided on the first fixing base 100, the lens to be tested 10 is carried on the second fixing base 300, and an image source 500 is provided on the third fixing base 400, so that the image source 500, the lens to be tested 10 and the image collector 200 are arranged sequentially along the X direction. Furthermore, the lens mount 310 carrying the lens under test 10 is adjusted to move closer to or further away from the image collector 200 by the lens adjustment seat 320, thereby enabling the distance between the image collector 200 and the lens under test 10 to be adjusted; the image source carrier 410 with the image source element 500 is adjusted to move closer to or further away from the second fixed seat 300 by the image source adjustment seat 420, thereby enabling the distance between the image source element 500 and the lens under test 10 to be adjusted. Thus, in the X direction, the image source element 500 forms a detection image through the lens under test 10, the image collector 200 is used to receive the detection image, and the detection image is then analyzed by the computer to realize the detection of image quality indicators. In this scheme, the distance between the image collector 200 and the lens under test 10 can be adjusted according to the detection requirements of the lens under test 10, and the distance between the image source 500 and the lens under test 10 can be adjusted according to the detection requirements of the lens under test 10, thereby facilitating the image quality detection of different lenses under test 10, and adjusting the distance according to the lens barrel requirements also improves the accuracy of the image quality index detection of the lens under test 10.

[0043] like Figure 1 , Figure 2As shown, the image source component 500 of this embodiment specifically includes a backlight plate 510 and a reticle 520. The backlight plate 510 is vertically mounted on the source support and is used to emit background light toward the lens 10 under test. The backlight plate 510 can be white light. The reticle 520 can be glued and fixed to the light-emitting side of the backlight plate 510. The reticle 520 is located on the rear side of the backlight plate 510 and emits light toward the rear. When the image collector 200 acquires the image of the reticle 520 in the lens 10 under test, a detection image of the reticle 520 and the pattern thereon is obtained. The detection image has a black and white dividing line on the reticle 520. The boundary width of the black and white dividing line of the reticle 520 is detected by the image quality analysis system on the computer, thereby analyzing the image quality index of the lens 10 under test.

[0044] like Figure 1 , Figure 2 As shown, the image source carrier 410 of this embodiment specifically includes: an image source carrier base plate 411 and a insertion block 412. The image source carrier base plate 411 is horizontally disposed on the image source adjustment seat 420, and the image source carrier plate is moved in the front-back direction by the drive of the image source adjustment seat 420. The insertion block 412 is disposed on the image source carrier base plate 411, and the insertion block 412 has an upwardly opening slot 413, in which the backlight plate 510 is inserted. In the specific structure, the insertion block 412 has a U-shaped structure with the insertion port 413 facing upward. Multiple insertion blocks 412 can be arranged at intervals along the left and right directions. The bottom of the insertion block 412 is fixedly connected to the image source carrier base plate 411 by screws. A lamp board locking screw 414 is screwed through the front side wall of the insertion block 412. When the backlight plate 510 is inserted into the insertion port 413, the backlight plate 510 is locked in the insertion block 412 by turning the lamp board locking screw 414.

[0045] like Figure 1 , Figure 2 As shown, the image source adjustment base 420 of this embodiment includes an X-axis linear displacement stage 421. The image source support base 410 is disposed on the X-axis linear displacement stage 421, and the image source component 500 is driven to move closer to or further away from the lens 10 under test by the X-axis linear displacement stage 421. The X-axis linear displacement stage 421 can only move the image source support base 410 in the front-back direction to achieve distance adjustment. The use of the X-axis linear displacement stage 421 simplifies the adjustment structure and optimizes the structure for easier use. The X-axis linear displacement stage 421 can be a manual moving stage for structural simplicity, or it can be an automatic moving stage for electric control. In addition, it is conceivable that the image source adjustment base 420 can also be a multi-axis linear moving stage.

[0046] like Figure 1 , Figure 3As shown, the lens mount 310 of this embodiment specifically includes a lens support plate 311 and a lifting platform 313. The lens support plate 311 is fixedly mounted on the lens adjustment seat 320. The lifting platform 313 is located on the side of the lens support plate 311 facing the first fixed seat 100 or the third fixed seat 400. The upper surface of the lifting platform 313 can form a supporting step with the upper surface of the lens support plate 311 to support both ends of the lens 10 under test. In the specific structure, the axial direction of the lens barrel of the lens 10 under test is mostly stepped, so the outer diameters of the front and rear ends of the lens 10 under test are different. Thus, by supporting the rear end lens barrel wall of the lens 10 under test through the lifting platform 313, the lens 10 under test can be stably mounted on the lens mount 310 in the front-rear direction, or even directly and stably placed on the lens mount 310 for image quality testing.

[0047] like Figure 1 , Figure 3 As shown, the lifting platform 313 can be configured in several ways: In the first method, the lifting platform 313 is fixed to the rear side of the lens carrier plate 311, so the lifting platform 313 and the lens carrier plate 311 can be integrated into each other. The heights of their upper surfaces are different, but this method is generally only suitable for one type of lens 10 under test. In the second method, as... Figure 1 , Figure 4 , Figure 5 As shown, the lifting platform 313 is adjustablely mounted on the lens support plate 311 via the lifting component 330, so that the upper surface of the lifting platform 313 is flush with or forms a height difference with the upper surface of the lens support plate 311. In the specific structure, a recessed opening 312 is formed on the rear side of the lens support plate 311, and the lifting component 330 is disposed through the recessed opening 312. The lifting platform 313 is located in the recessed opening 312 and moves up and down. When the lifting platform 313 is lowered, it can be inserted into the recessed opening 312, so that the upper surface of the lifting platform 313 is flush with the upper surface of the lens support plate 311, thereby supporting the lens barrel without axial steps. When the lifting platform 313 is raised, the recessed opening 312 can protrude, so that the upper surface of the lifting platform 313 is higher than the upper surface of the lens support plate 311, thus forming a height difference. This can support the lens barrel with axial steps, and the height difference can be adjusted by the lifting component 330 so that it can be applied to different specifications of the lens 10 under test.

[0048] like Figure 4 , Figure 5As shown, the lifting assembly 330 specifically includes a lifting screw 331 and a guide post 333. The lifting screw 331 is screwed onto the lens support plate 311. A T-shaped head 332 is provided at the upper end of the lifting screw 331, and the T-shaped head 332 is rotatably disposed within the lifting platform 313. A T-slot can be provided within the lifting platform 313, so that when the T-shaped head 332 rotates within the T-slot, it will not disengage from the lifting platform 313. When the lifting screw 331 is screwed up or down, it can drive the lifting platform 313 to rise or fall. The guide post 333 is disposed on the lifting platform 313 and movably passes through the lens support plate 311. During the rising or falling of the lifting platform 313, the guide post 333 moves vertically along with the lifting platform 313, limiting the movement of the lifting platform 313 and ensuring stable vertical movement of the lifting platform 313.

[0049] like Figure 4 , Figure 6 As shown, in another structure, to make the lens under test 10 more stable on the lens mount 310, a limiting component 340 can also be included on the lens support plate 311. The limiting component 340 is used to limit the movement of the lens under test 10 in the left and right directions. In the specific structure, the limiting component 340 includes L-shaped blocks 341 on the left and right sides. The L-shaped blocks 341 have oblong holes 342. The blocks are connected to the lens support plate 311 by setting block screws 343 through the oblong holes 342, so that the distance between the L-shaped blocks 341 on the left and right sides can be adjusted. The L-shaped blocks 341 on the left and right sides are mirrored and limit the lens under test 10 against the middle, so that the lens under test 10 can be stably fixed on the lens mount 310.

[0050] like Figure 4 , Figure 6 As shown, the lens adjustment mount 320 in this embodiment includes an XY-axis linear displacement stage 321. The lens mount 310 is mounted on the XY-axis linear displacement stage 321 and is driven by the XY-axis linear displacement stage 321 to move the lens under test 10. The XY-axis linear displacement stage 321 can drive the lens mount 310 to move in the front-back and left-right directions. When moving in the front-back direction, the front-back distance between the image collector 200 and the lens under test 10 can be adjusted, as can the front-back distance between the lens under test 10 and the image source 500. When moving in the left-right direction, the left-right distance of the central axis of the lens under test 10 can be adjusted, thereby adjusting it to correspond with the image collector 200 in the left-right direction, ensuring image quality, and thus improving detection accuracy. The use of the XY-axis linear displacement stage 321 simplifies the adjustment structure and optimizes the structure for easier use. The XY-axis linear displacement stage 321 can be a manual moving stage for simple structure, or an automatic moving stage for electric control.

[0051] like Figure 1 , Figure 7 As shown, the first mounting base 100 in this embodiment specifically includes a raised platform 110 and a camera connecting platform 120. The raised platform 110 extends a predetermined length along the height direction, thereby facilitating the raising of the image collector 200 so that the image collector 200 is at the same height as the lens 10 under test. The camera connecting platform 120 is connected to the raised platform 110, and the image collector 200 is fixed to the camera connecting platform 120 by screws. The image collector 200 is a camera, and the bottom of the camera has screw holes for easy connection to the camera connecting platform 120 by screws. In another embodiment, the camera connecting platform 120 can also be raised and lowered on the raised platform 110. In this case, a cavity is opened inside the raised platform 110, and a raising component 330 as described above is provided. Similar to the raising and lowering control method of the raised platform 313, the camera connecting platform 120 can be adjusted up and down to raise the image collector 200 to accommodate lenses 10 of different diameters. You can also replace the platform 110 with one of appropriate height according to the different models of the lens 10 under test, so that it can be adapted to different lenses 10 under test.

[0052] like Figure 1 As shown, the lens image quality inspection device of this embodiment also includes a base plate 600, on which the first fixing seat 100, the second fixing seat 300, and the third fixing seat 400 are all disposed. Elongated holes are provided on the base plate, and screws passing through these holes allow for adjustable mounting of each fixing seat on the base plate. This ensures the stability of each fixing seat, facilitating the removal and storage of the entire assembly.

[0053] In summary, the image quality testing device for lenses proposed in this application features an image source component that is adjustable in front of the lens under test, the position of the lens under test is adjustable, and an image collector positioned behind the lens under test. The image collector captures the image of the image source component in the lens under test, thereby obtaining a test image. The image collector is connected to an image quality analysis system on a computer via a data cable, thus facilitating image quality testing of the lens under test. It also has the advantages of simple setup and convenient testing.

[0054] 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. An image quality inspection device for a lens, characterized in that, include: A first fixing base, on which an image collector is provided; The second fixing seat is disposed on the light-inlet side of the image collector and includes a lens mount and a lens adjustment mount. The lens mount is used to support the lens to be tested and can be moved closer to or further away from the image collector by the adjustment of the lens adjustment mount. The third fixing seat is disposed on the side of the second fixing seat away from the first fixing seat, and includes an image source carrier and an image source adjustment seat. The image source carrier is provided with an image source component, which moves closer to or further away from the second fixing seat by adjustment of the image source adjustment seat. The image source device forms a detection image through the lens under test, and the image collector is used to receive the detection image.

2. The image quality inspection device for a lens as described in claim 1, characterized in that, The image source component includes: a backlight panel, which is vertically mounted on the source support and is used to emit background light toward the lens under test; A reticle is disposed on the light-emitting side of the backlight panel.

3. The image quality inspection device for a lens as described in claim 2, characterized in that, The image source support includes: an image source support base plate, which is horizontally disposed on the image source adjustment base; The card insertion block is disposed on the image source carrier base plate, and the card insertion block has an upward-facing slot, into which the backlight plate is inserted.

4. The image quality inspection device for a lens as described in claim 2, characterized in that, The image source adjustment base includes an X-axis linear displacement stage, and the image source support is disposed on the X-axis linear displacement stage. The image source component is driven to move closer to or away from the lens under test by the X-axis linear displacement stage.

5. The image quality inspection device for a lens as described in claim 1, characterized in that, The lens mount includes a lens support plate, which is fixedly mounted on the lens adjustment mount. A lifting platform is provided on the side of the lens support plate facing the first or third fixing seat; The upper surface of the lifting platform can form a supporting step with the upper surface of the lens carrier plate to support both ends of the lens under test.

6. The image quality inspection device for a lens as described in claim 5, characterized in that, The lifting platform is adjustablely mounted on the lens support plate via a lifting component, so that the upper surface of the lifting platform is flush with or forms a height difference with the upper surface of the lens support plate. The lifting assembly includes: a lifting screw, which is screwed onto the lens support plate, and a T-shaped head is provided at the upper end of the lifting screw, which is rotatably disposed within the lifting platform; A guide post is provided on the raised platform and movably passes through the lens support plate.

7. The image quality inspection device for a lens as described in claim 5, characterized in that, The lens carrier plate also includes a limiting component, which is used to limit the movement of the lens under test in the left and right directions.

8. The image quality inspection device for a lens as described in claim 1, characterized in that, The lens adjustment mount includes an XY-axis linear displacement stage, the lens mount is disposed on the XY-axis linear displacement stage, and the lens under test is moved by driving the XY-axis linear displacement stage.

9. The image quality inspection device for a lens as described in any one of claims 1-8, characterized in that, The first fixed base includes: a raised platform, which extends a predetermined length along the height direction; A camera mounting platform is attached to the raised platform, and the image collector is fixed to the camera mounting platform by screws.

10. The image quality inspection device for a lens as claimed in claim 1, characterized in that, The image quality inspection device for the lens also includes a base plate, on which the first fixing seat, the second fixing seat, and the third fixing seat are all disposed.

Images