CN216815958U - Lens array image quality testing device - Google Patents
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- CN216815958U CN216815958U CN202220575597.2U CN202220575597U CN216815958U CN 216815958 U CN216815958 U CN 216815958U CN 202220575597 U CN202220575597 U CN 202220575597U CN 216815958 U CN216815958 U CN 216815958U
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Abstract
The utility model discloses a lens array image quality testing device, which relates to the technical field of optical testing, and comprises a first slide way, and a parallel light source, a testing card and an imaging module which are sequentially arranged on the first slide way, wherein a lens array to be tested is arranged between the testing card and the imaging module, the light emitting direction of the parallel light source faces towards the testing card, the testing card is slidably arranged on the first slide way through a first displacement sensor and a first driving piece, the imaging module is slidably arranged on the first slide way through a second displacement sensor and a second driving piece, and the first displacement sensor, the first driving piece, the second displacement sensor, the second driving piece and the imaging module are respectively connected with a controller. The lens array image quality testing device provided by the utility model can quickly adjust the object-image distance and realize the accurate measurement of the object distance and the image distance.
Description
Technical Field
The application relates to the technical field of optical testing, in particular to a lens array image quality testing device.
Background
The self-focusing lens is also called gradient index lens, and refers to a cylindrical optical lens with the refractive index distribution gradually changed along the radial direction. With the development of miniaturization, light weight and integration of optical elements, the optical elements are developed from discrete elements to array elements, the micro lens array is a two-dimensional integrated device, and has the advantages of simple structure, short imaging distance, good imaging quality, high dynamic resolution, small volume, light weight and the like besides the functions of collimation, focusing, imaging and the like of common lenses, so that the micro lens array has important application in equipment such as fax machines, copying machines, electronic whiteboards, image-text scanning systems and the like.
The image quality test of the micro lens array is a test for the imaging performance of the micro lens array, and no corresponding test device for the micro lens array exists in the market at present. Testing is typically performed using a conventional optical bench connection test system. The light source, the resolution plate, the lens to be measured and the reading microscope are sequentially arranged on the optical bench, the resolution plate serves as an object space of the lens to be measured, imaging of the object space resolution plate in the reading microscope is observed visually, when the imaging is clear, the object distance is determined by measuring the distance between the resolution plate and the lens to be measured, the image distance is determined by adjusting a screw rod (micrometer) of the reading microscope when the imaging is clear, and finally the resolution of the lens to be measured is determined through the object distance, the image distance and clear imaging information. Because the resolution plate and the reading microscope are moved closely by manual operation to determine the object image distance, the object image is determined more complexly, and the efficiency is lower; moreover, the object-image distance is determined by adopting a ruler, and the information of the clear image is determined by adopting manual reading, so that the accuracy of the object-image distance is lower; the object-image distance is inaccurate, and the resolution interpretation is affected fatally.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a lens array image quality testing arrangement, can quick adjustment object image distance and realize the accurate measurement of object distance and image distance.
The embodiment of the application provides a lens array image quality testing arrangement, include first slide and set gradually the collimated light source on first slide, test card and formation of image module, wherein, the lens array that awaits measuring sets up between test card and formation of image module, collimated light source's light-emitting direction orientation test card, the first displacement sensor of test card and first driving piece slide and set up on first slide, the formation of image module slides through second displacement sensor and second driving piece and sets up on first slide, first displacement sensor, first driving piece, second displacement sensor, second driving piece and formation of image module are connected with the controller respectively.
As an implementable manner, the lens array image quality testing device further comprises a second slide way connected with the first slide way, the lens array to be tested is arranged on the second slide way in a sliding manner, the lens arrangement direction of the lens array to be tested is parallel to the direction of the second slide way, and the extending direction of the first slide way is perpendicular to the extending direction of the second slide way.
As an implementable mode, the lens array to be tested is connected to the second slide rail through the third displacement sensor and the third driving piece in a sliding mode, and the third displacement sensor and the third driving piece are respectively connected with the controller.
As an implementable manner, the imaging module includes a resolution test component and a Modulation Transfer Function (MTF) test component, the resolution test component includes a photosensitive chip and a first image processing module, the MTF test component includes a wavefront sensor and a second image processing module, and the photosensitive chip and the wavefront sensor are detachably connected to the first slideway respectively.
As an implementable mode, the MTF testing component further comprises a beam expander detachably connected to the first slide way, and the beam expander is arranged between the lens array to be tested and the wavefront sensor.
As one practical way, the test card is a resolution board.
As an implementable mode, the lens array image quality testing device further comprises a protective shell, the protective shell encloses to form a control area, the controller is arranged in the control area, and a control button electrically connected with the controller is arranged on the outer side wall of the protective shell and used for controlling the first driving piece, the second driving piece and the third driving piece to work.
As a practical way, the first driving element, the second driving element and the third driving element are all stepping motors.
As a practical way, the parallel light source includes a light emitting source and a collimating lens disposed on the light emitting side of the light emitting source.
As a practical way, the lens array image quality testing device further comprises a display connected with the controller and the image respectively.
The beneficial effects of the embodiment of the application include:
the utility model provides a lens array image quality testing device, which comprises a first slide way, a parallel light source, a testing card and an imaging module, wherein the parallel light source, the testing card and the imaging module are sequentially arranged on the first slide way, a lens array to be tested is arranged between the testing card and the imaging module, the light emitting direction of the parallel light source faces to the testing card, emergent light of the parallel light source penetrates through the testing card and penetrates through the lens array to be tested to form a testing image on the imaging module, the testing image comprises a preset pattern on the testing card, the testing card is arranged on the first slide way in a sliding way through a first displacement sensor and a first driving piece, the first driving piece drives the testing card to move on the first slide way so that the distance between the testing card and the lens array to be tested is a reasonable object distance, at the moment, the first displacement sensor measures the object distance and transmits the object distance to a controller, the imaging module is arranged on the first slide way through a second displacement sensor and a second driving piece, the second driving piece drives the imaging module to move on the first slide way, so that the test image can clearly display the preset pattern on the test card, and at the moment, the second displacement sensor measures the image distance and transmits the image distance to the controller. The first displacement sensor, the first driving piece, the second displacement sensor, the second driving piece and the imaging module are respectively connected with the controller. The controller controls to acquire the object distance and the image distance of the first displacement sensor and the second displacement sensor and determines the imaging quality of the lens array to be tested according to the information on the test image. Through first driving piece, second driving piece drive test card and formation of image module respectively, can the quick adjustment object image apart from, adopt first displacement sensor and second displacement sensor to measure object distance and image distance respectively, can realize the accurate measurement of object image apart from. The lens array image quality testing device provided by the utility model can quickly adjust the object-image distance and realize the accurate measurement of the object distance and the image distance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a lens array image quality testing apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another lens array image quality testing apparatus according to an embodiment of the present disclosure.
Icon: 100-lens array image quality testing device; 110-a first slide; 120-a collimated light source; 130-test card; 131-a first displacement sensor; 132-a first drive member; 140-an imaging module; 141-a photosensitive chip; 143-a wavefront sensor; 145-beam expander; 151-second displacement sensor; 152-a second drive member; 160-a controller; 170-a second slide; 171-a third displacement sensor; 172-a third drive member; 180-a lens array to be tested; 190-display.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be noted that the terms "center", "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the application are used, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The microlens array has important application in the settings of fax machines, copiers, electronic whiteboards, image scanning systems and the like, the image quality of the microlens array needs to be tested in order to test the imaging performance of the microlens array, and a testing device for testing the image quality of the microlens array is not available in the prior art.
The utility model provides a lens array image quality testing device 100, as shown in fig. 1, comprising a first slide rail 110, and a parallel light source 120, a test card 130 and an imaging module 140 sequentially arranged on the first slide rail 110, wherein a lens array 180 to be tested is arranged between the test card 130 and the imaging module 140, the light emitting direction of the parallel light source 120 faces the test card 130, the test card 130 is slidably arranged on the first slide rail 110 through a first displacement sensor 131 and a first driving member 132, the imaging module 140 is slidably arranged on the first slide rail 110 through a second displacement sensor 151 and a second driving member 152, and the first displacement sensor 131, the first driving member 132, the second displacement sensor 151 and the second driving member 152 are respectively connected with a controller 160.
During testing, the lens array 180 to be tested is disposed between the test card 130 and the imaging module 140, the emergent light of the collimated light source 120 passes through the test card 130, then passes through the lens to be tested and forms a test image on the imaging module 140, the controller 160 controls the first driving member 132 to drive the test card 130 to slide on the first slideway 110 to adjust the distance between the test card 130 and the lens array 180 to be tested, the controller 160 controls the second driving member 152 to drive the imaging module 140 to slide on the first slideway 110 to adjust the distance between the lens array 180 to be tested and the imaging module 140, the final test image can clearly display the pattern on the test card 130, at this time, the controller 160 obtains the distance between the test card 130 and the lens array 180 to be tested measured by the first displacement sensor 131 as an object distance, obtains the distance between the lens array 180 to be tested and the imaging module 140 to be tested by the second displacement sensor 151 as an image distance, and the imaging quality of the lens array 180 to be tested is known according to the pattern information, the object distance and the image distance on the test image.
The specific form of the first driving member 132 and the second driving member 152 is not limited in the present invention, and may be a linear motor, a stepping motor, or the like. The specific form of the collimated light source 120 is not limited in the present invention, and the collimated light source 120 may be formed by combining a point light source and a collimating lens, or may be a collimator directly, as long as the emitted light can be irradiated on the test card 130 in parallel.
The lens array image quality testing device 100 provided by the utility model comprises a first slide rail 110, and a parallel light source 120, a test card 130 and an imaging module 140 which are sequentially arranged on the first slide rail 110, wherein the lens array 180 to be tested is arranged between the test card 130 and the imaging module 140, the light emitting direction of the parallel light source 120 faces the test card 130, the light of the parallel light source 120 penetrates through the test card 130 and penetrates through the lens array 180 to be tested to form a test image on the imaging module 140, the test image comprises a preset pattern on the test card 130, the test card 130 is slidably arranged on the first slide rail 110 through a first displacement sensor 131 and a first driving part 132, the first driving part 132 drives the test card 130 to move on the first slide rail 110, so that the distance between the test card 130 and the lens array 180 to be tested is a reasonable object distance, at this time, the first displacement sensor 131 measures the object distance and transmits the object distance to a controller 160, the imaging module 140 is slidably disposed on the first slide rail 110 through the second displacement sensor 151 and the second driving member 152, the second driving member 152 drives the imaging module 140 to move on the first slide rail 110, so that the test image can clearly display the preset pattern on the test card 130, and at this time, the second displacement sensor 151 measures the image distance and transmits the image distance to the controller 160. The first displacement sensor 131, the first driving member 132, the second displacement sensor 151, the second driving member 152, and the imaging module 140 are connected to a controller 160, respectively. The controller 160 controls to acquire the object distance and the image distance of the first and second displacement sensors 131 and 151 and determines the imaging quality of the lens array to be tested 180 according to information on the test image. Through first driving piece 132, second driving piece 152 drive test card 130 and formation of image module 140 respectively, can quick adjustment object image distance, adopt first displacement sensor 131 and second displacement sensor 151 to measure object distance and image distance respectively, can realize the accurate measurement of object image distance. The lens array image quality testing device 100 provided by the utility model can quickly adjust the object-image distance and realize the accurate measurement of the object distance and the image distance.
Optionally, as shown in fig. 2, the lens array image quality testing apparatus 100 further includes a second slide 170 connected to the first slide 110, the lens array 180 to be tested is slidably disposed on the second slide 170, a lens arrangement direction of the lens array 180 to be tested is parallel to a direction of the second slide 170, and an extending direction of the first slide 110 is perpendicular to an extending direction of the second slide 170.
To facilitate the application of the lens array, the lens array typically has a slightly greater length, while the length of the test card 130 and the parallel light sources 120 are limited, such that the length of the lens array 180 to be tested is much greater than the test card 130, in order to be able to test the overall condition of the lens array 180 to be tested, the lens array 180 to be tested needs to be tested in sections, in order to move the lens array to be tested 180 conveniently, a second slide way 170 is provided, the second slide way 170 is perpendicular to the extending direction of the first slide way 110, the lens array to be tested 180 is slidably arranged on the second slide way 170, after completing a section of the inner lens test, the lens array 180 to be tested is moved along the second slide 170, the test card 130 is aligned with the lens in the next segment for testing, and the testing of all the lenses in the lens array 180 to be tested is completed in sequence, and the controller 160 determines the testing result of the whole lens array 180 to be tested according to the testing result of each segment.
It should be noted that the distance that the lens array 180 to be tested moves along the second slide 170 each time is not limited, and may be the same as the length of the test card 130, or may be smaller than the length of the test card 130, so that there is an overlapping portion between the two sections. However, it may not be longer than the length of the test card 130, avoiding missing a portion of the lenses in the lens array.
In an implementation manner of the embodiment of the present invention, as shown in fig. 2, the lens array to be tested 180 is slidably connected to the second slide 170 through a third displacement sensor 171 and a third driving member 172, and the third displacement sensor 171 and the third driving member 172 are respectively connected to the controller 160.
In order to precisely control the distance of each movement of the lens array to be tested 180 along the second slide 170, the third driving member 172 is provided, and the third driving member 172 moves the lens array to be tested 180 by a preset length. The third displacement sensor 171 detects the distance of each movement of the lens array 180 to be tested.
Optionally, as shown in fig. 2, the imaging module 140 includes a resolution testing component and an MTF testing component, the resolution testing component includes a photosensitive chip 141 and a first image processing module, the MTF testing component includes a wavefront sensor 143 and a second image processing module, and the photosensitive chip 141 and the wavefront sensor 143 are detachably connected to the first slideway 110, respectively.
Those skilled in the art will appreciate that the evaluation of image quality can be performed using resolution, as well as MTF. In order to more fully test the image quality of the lens array 180 to be tested, the imaging module 140 of the present invention includes a resolution testing component and an MTF testing component, wherein the resolution testing component tests the resolution of the lens array 180 to be tested, and the MTF testing component tests the resolution of the lens array 180 to be tested. The light sensing element senses light penetrating through the lens array to be detected, converts the light into an electronic signal and transmits the electronic signal to the first image processing module, the first image processing module processes the signal and transmits the signal to the controller 160, and the controller 160 calculates the resolution. The wavefront sensor 143 is configured to sense a wave aberration of the light passing through the lens array to be measured and transmit the wave aberration to the second image processing module, the second image processing module processes the wave aberration and transmits the wave aberration to the controller 160, and the controller 160 calculates an MTF value.
It should be noted that, during the resolution test, the light sensing chip 141 needs to receive the light passing through the lens array 180 to be tested; during the MTF test, the wavefront sensor 143 also needs to receive the light passing through the lens array 180 to be tested, so the resolution test and the MTF test cannot be performed simultaneously, and when testing the resolution, the wavefront sensor 143 needs to be detached, and similarly, when testing the MTF, the photosensitive chip 141 needs to be detached, so as to prevent the wavefront sensor 143 and the photosensitive chip 141 from interfering with each other.
The first image processing module and the second image processing module may be integrated into the controller 160, or may be independent components.
In an implementation manner of the embodiment of the present invention, as shown in fig. 2, the MTF testing component further includes a beam expander 145 detachably connected to the first slide rail 110, and the beam expander 145 is disposed between the lens array 180 to be tested and the wavefront sensor 143. In order to enable the wavefront sensor 143 to sense clearer light, a beam expander 145 is disposed between the wavefront sensors 143, and the beam expander 145 can change the beam diameter and the divergence angle of the light, so that the light can be perpendicularly irradiated on the wavefront sensor 143.
Optionally, the test card 130 is a resolution board. The resolution board is made by adopting a unified standard, patterns such as parallel patterns, wedge wave regular patterns and the like are stored in the inspection board of one board, so that the resolution of the lens array to be inspected can be conveniently tested for various patterns, and meanwhile, the tested data is the same as the industrial standard. Specifically, the resolution board may be a standard resolution board of system USAF 1951, or a standard resolution board of international standard ISO 12233.
In an implementation manner of the embodiment of the present invention, the lens array image quality testing apparatus 100 further includes a protective casing, the protective casing encloses to form a control area, the controller 160 is disposed in the control area, and a control button electrically connected to the controller 160 is disposed on an outer side wall of the protective casing, and is used for controlling operations of the first driving element 132, the second driving element 152, and the third driving element 172.
The protective shell can protect the controller 160 from being damaged by the outside, the outer side wall of the protective shell is provided with a control button, the control button can facilitate the movement operation of an operator on the first driving piece 132, the second driving piece 152 and the third driving piece 172, the specific form of the control button is not limited in the utility model, and the control button can be a pressing button or a toggle button.
Optionally, the first driving member 132, the second driving member 152 and the third driving member 172 are all stepping motors.
The test card 130, the imaging device and the lens array to be tested 180 are driven by the stepping motor, so that the test card 130, the imaging device and the lens array to be tested 180 can move in a set step length more conveniently. Illustratively, the first driving member 132 is adjusted in steps of 0.5um, which improves the positional accuracy of the test card 130 when adjusting its positional movement relative to the steps of the optical bench 100 um.
In an implementation manner of the embodiment of the present invention, the collimated light source 120 includes a light emitting source and a collimating lens disposed at the light emitting side of the light emitting source. Compared with the parallel light generated by the collimator, the arrangement of the light emitting source and the collimating lens can simplify the structure of the parallel light source 120 and save the volume of the lens array testing device.
In one manner of implementing the embodiment of the present invention, as shown in fig. 2, the lens array image quality testing apparatus 100 further includes a display 190 connected to the controller 160. To enable the operator to understand the real-time status of the test image, the adjustment of the position of the test card 130 and the position of the imaging module 140 are facilitated.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a lens array image quality testing arrangement, its characterized in that, include first slide and set gradually in collimated light source, test card and formation of image module on the first slide, wherein, await measuring lens array set up in the test card with between the formation of image module, collimated light source's light-emitting direction orientation the test card, the first displacement sensor of test card and first driving piece slide and set up on the first slide, the formation of image module passes through second displacement sensor and second driving piece slide and set up on the first slide, first displacement sensor, first driving piece, second displacement sensor, second driving piece and the formation of image module is connected with the controller respectively.
2. The lens array image quality testing device of claim 1, further comprising a second slide connected to the first slide, wherein the lens array to be tested is slidably disposed on the second slide, a lens arrangement direction of the lens array to be tested is parallel to a direction of the second slide, and the first slide is perpendicular to an extending direction of the second slide.
3. The lens array image quality testing device of claim 2, wherein the lens array to be tested is slidably connected to the second slide rail through a third displacement sensor and a third driving member, and the third displacement sensor and the third driving member are respectively connected to the controller.
4. The lens array image quality testing device of claim 1, wherein the imaging module comprises a resolution testing component and an MTF testing component, the resolution testing component comprises a photosensitive chip and a first image processing module, the MTF testing component comprises a wavefront sensor and a second image processing module, and the photosensitive chip and the wavefront sensor are respectively detachably connected to the first slideway.
5. The lens array image quality testing device of claim 4, wherein the MTF testing component further comprises a beam expander detachably connected to the first slide, the beam expander being disposed between the lens array to be tested and the wavefront sensor.
6. The lens array image quality testing apparatus of claim 1, wherein the test card is a resolution board.
7. The device for testing image quality of a lens array according to claim 3, further comprising a protective case, wherein the protective case encloses a control area, the controller is disposed in the control area, and a control button electrically connected to the controller is disposed on an outer sidewall of the protective case and is used for controlling operations of the first driving element, the second driving element and the third driving element.
8. The lens array image quality testing device of claim 3, wherein the first driving member, the second driving member and the third driving member are all stepping motors.
9. The lens array image quality testing device of claim 1, wherein the parallel light source comprises a light emitting source and a collimating lens disposed on a light emitting side of the light emitting source.
10. The lens array image quality testing device of claim 4, further comprising a display connected to the controller, the first image processing module and the second image processing module, respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115046479A (en) * | 2022-08-12 | 2022-09-13 | 杭州纳境科技有限公司 | Superlens detection device and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115046479A (en) * | 2022-08-12 | 2022-09-13 | 杭州纳境科技有限公司 | Superlens detection device and system |
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