Metasurface lens testing tool

Abstract

The utility model discloses a metasurface lens testing tool. The metasurface lens testing tool comprises a testing carrier plate, a lens clamp and a CCD calibration assembly. The lens clamp is assembled on the test carrier plate, the lens clamp comprises a base and a cover plate which are matched with each other, the base is provided with a lens mounting groove, the groove bottom of the lens mounting groove is provided with a first diaphragm hole, and the cover plate is provided with a second diaphragm hole; the CCD calibration assembly is used for calibrating the first diaphragm hole and enabling the pattern center of the lens, the second diaphragm hole and the first diaphragm hole to be aligned. The state of the metasurface lens in the optical system is simulated through the lens clamp, the CCD calibration assembly is used for calibrating the first diaphragm hole in the base, then the pattern center of the metasurface lens and the second diaphragm hole in the cover plate are aligned with the first diaphragm hole, and therefore the metasurface lens can be accurately calibrated under the condition that the whole optical system does not need to be integrally assembled. Therefore, the optical performance of the metasurface lens can be tested.

Description

Technical Field

[0001] This application relates to the field of optical component performance testing technology, and in particular to a metasurface lens testing fixture. Background Technology

[0002] With the rapid development of metasurface technology, optical components based on metasurface technology, especially metasurface lenses, have been increasingly widely used in imaging fields such as infrared imaging, Time-of-Flight (TOF) ranging, and eye tracking due to their thin, light, and planar structure. To ensure that the performance and design parameters of metasurface lenses meet the requirements of practical applications, it is usually necessary to accurately measure parameters such as transmittance, focusing efficiency, field of view (FOV), focal length (EFL), focal ratio (FNO), total optical length (OPTTL), refractive index (RI), distortion, and modulation transfer function (MTF).

[0003] However, traditional refractive lenses can only test the physical dimensions and simple parameters of a single lens, such as transmittance and focusing efficiency, and cannot effectively evaluate more comprehensive optical performance indicators. To evaluate more complete optical performance, paired lenses are usually required, utilizing mutual compensation between multiple lenses. Therefore, optical performance testing and evaluation are typically performed after assembling multiple lenses into a complete optical system to determine if it meets requirements. In other words, traditional lens performance evaluation is conducted on the finished lens, and there is no testing of the optical performance of individual lenses.

[0004] This results in high testing costs and long testing cycles, severely limiting the efficiency of rapid product iteration and optimization. Furthermore, the assembled system cannot easily analyze the optical performance of individual lenses separately. Summary of the Invention

[0005] The purpose of this application is to provide a testing fixture for metasurface lenses.

[0006] To achieve one of the above-mentioned objectives, one embodiment of this application provides a metasurface lens testing fixture, comprising:

[0007] Test carrier board;

[0008] A lens fixture is assembled on the test carrier plate. The lens fixture includes a base and a cover plate that cooperate with each other. The base is provided with a lens mounting groove, and the bottom of the lens mounting groove is provided with a first aperture hole. The cover plate is provided with a second aperture hole.

[0009] The CCD calibration component is used to calibrate the first aperture and align the pattern center of the lens, the second aperture, and the first aperture.

[0010] As a further improvement of one embodiment of this application, the CCD calibration component is located above the test substrate and is movable relative to the test substrate.

[0011] As a further improvement of one embodiment of this application, the lens clamp further includes a limiting structure, the limiting structure including a protrusion and a locking groove that cooperate with each other, one of the protrusion and the locking groove being disposed on the base, and the other of the protrusion and the locking groove being disposed on the cover plate.

[0012] As a further improvement of one embodiment of this application, both the protrusion and the snap-fit ​​groove are annular, the protrusion extends into the snap-fit ​​groove, and the lens mounting groove is located inside the snap-fit ​​groove.

[0013] As a further improvement of one embodiment of this application, the bottom of the lens mounting groove is provided with a groove, the first aperture is located in the area of ​​the groove, and an infrared filter is provided at the bottom of the groove corresponding to the first aperture.

[0014] As a further improvement of one embodiment of this application, an anti-reflection filter is provided on the cover plate corresponding to the second aperture hole.

[0015] As a further improvement of one embodiment of this application, the lens mounting groove includes a lens mounting area and an operating area, wherein the operating area is recessed relative to the lens mounting area in a direction away from the cover plate.

[0016] As a further improvement of one embodiment of this application, the operating area is provided with a pair and is respectively located on opposite sides of the lens mounting area.

[0017] As a further improvement of one embodiment of this application, the base is provided with an assembly groove on the side away from the cover plate, and the test plate is provided with an assembly boss at the end facing the lens fixture, the assembly boss being engaged in the assembly groove.

[0018] As a further improvement of one embodiment of this application, the assembly groove is annular.

[0019] Compared with existing technologies, the metasurface lens testing fixture of this application has the following beneficial effects: By simulating the state of a metasurface lens in an optical system through a lens fixture, the lens fixture is placed on the test carrier plate, and the high-precision calibration function of the CCD calibration component is used to calibrate the first aperture on the base, thereby aligning the pattern center of the metasurface lens and the second aperture on the cover plate with the first aperture, eliminating installation deviations, and ensuring that the pattern center of the metasurface lens is accurately aligned with the optical path. Thus, without the need for overall assembly into a complete optical system, the optical performance parameters of the metasurface lens mounted on the test carrier plate, such as transmittance, focusing efficiency, FOV, FNO, EFL, OPTTL, Distortion, and MTF, can be tested. This greatly improves the accuracy of optical performance testing and effectively solves the problems of high cost, long cycle, and low iteration efficiency caused by the need for overall lens assembly in traditional optical performance testing. It significantly reduces the cost and cycle of performance testing, improves the efficiency of product design and development, and meets the actual needs of rapid iterative analysis. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a metasurface lens testing fixture according to an embodiment of this application;

[0021] Figure 2 This is a three-dimensional structural schematic diagram of a lens clamp according to an embodiment of this application, which shows the state in which the cover plate is assembled on the base;

[0022] Figure 3 yes Figure 2 An explosion diagram;

[0023] Figure 4 This is a schematic diagram of the structure of a cover plate according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the structure of a base according to an embodiment of this application;

[0025] Figure 6 yes Figure 2 Longitudinal sectional view of the middle lens fixture;

[0026] Figure 7 yes Figure 6 Enlarged diagram of section A in the middle;

[0027] Figure 8 yes Figure 6 Enlarged schematic diagram of section B.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Metasurface lens test tooling; 1. Test carrier plate; 11. Assembly boss; 2. Lens fixture; 21. Base; 211. Lens mounting groove; 2111. Lens mounting area; 2112. Operation area; 212. First aperture hole; 213. Mounting boss; 214. Groove; 215. Assembly groove; 22. Cover plate; 221. Second aperture hole; 222. Notch; 23. Limiting structure; 231. Protrusion; 232. Clamping groove; 24. Infrared filter; 3. CCD calibration component; 20. Metasurface lens. Detailed implementation manners

[0030] The present application will be described in detail below with reference to the specific embodiments shown in the drawings.

[0031] In each drawing of the present application, for the convenience of illustration, the dimensions of some structures or parts are enlarged relative to other structures or parts. Therefore, it is only used to illustrate the basic structure of the subject matter of the present application.

[0032] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, structures or parameters, the described objects should not be limited by these terms. These terms are only used to distinguish these described objects from each other.

[0033] A metasurface lens is a planar optical element based on metasurface technology, which regulates the phase, amplitude and polarization of light waves through sub-wavelength structures. The patterns thereon are composed of periodically or aperiodically arranged sub-wavelength structure units (such as nanocolumns, nanoantennas).

[0034] Refer Figure 1 As shown, an embodiment of the present application provides a metasurface lens test tooling 10 for quickly and accurately detecting the optical performance of a single metasurface lens 20.

[0035] Specifically, the metasurface lens test tooling 10 includes a test carrier plate 1, a lens fixture 2 and a CCD calibration component 3. The lens fixture 2 is assembled on the test carrier plate 1.

[0036] In addition, the metasurface lens test tooling 10 further includes an optical test mechanism for testing the optical performance of the metasurface lens 20 loaded on the test carrier plate 1.

[0037] Refer Figures 2 to 7 As shown, among them, the lens fixture 2 includes a mutually cooperating base 21 and a cover plate 22. The base 21 is provided with a lens mounting groove 211, and a first aperture hole 212 is provided at the bottom of the lens mounting groove 211. The cover plate 22 is provided with a second aperture hole 221.

[0038] By placing the metasurface lens 20 in the lens mounting slot 211 and positioning it between the base 21 and the cover plate 22, the state of the metasurface lens 20 in the optical system is simulated through the cooperation of the base 21 and the cover plate 22, and then the optical performance of the metasurface lens 20 is tested using an optical testing mechanism.

[0039] CCD calibration component 3 is used to calibrate the first aperture 212 and align the pattern center of metasurface lens 20, the second aperture 221, and the first aperture 212.

[0040] In this way, by simulating the state of the metasurface lens 20 in the optical system through the lens fixture 2, the lens fixture 2 is placed on the test carrier plate 1, and the high-precision calibration function of the CCD calibration component 3 is used to calibrate the first aperture 212 on the base 21. This aligns the pattern center of the metasurface lens 20 with the second aperture 221 on the cover plate 22 and the first aperture 212, eliminating installation deviations and ensuring that the pattern center of the metasurface lens 20 is precisely aligned with the optical path. Thus, without the need for the entire lens to be assembled into a complete optical system, the optical performance parameters of the metasurface lens 20 mounted on the test carrier plate 1, such as transmittance, focusing efficiency, FOV, FNO, EFL, OPTTL, Distortion, and MTF, can be tested. This greatly improves the accuracy of optical performance testing and effectively solves the problems of high cost, long cycle, and low iteration efficiency caused by the need to assemble the entire lens before evaluation in traditional optical performance testing. It significantly reduces the cost and cycle of performance testing, improves the efficiency of product design and development, and meets the actual needs of rapid iterative analysis.

[0041] The CCD calibration component 3 is located above the test carrier 1 and can move relative to the test carrier 1. In this way, the CCD calibration component 3 can support calibration at multiple angles and distances to meet the testing requirements of different metasurface lenses 20.

[0042] When calibrating the first aperture 212 and aligning the pattern center of the metasurface lens 20, the second aperture 221 and the first aperture 212, the CCD calibration component 3 can be positioned above the lens fixture 2 to facilitate calibration and alignment. After alignment is completed, the CCD calibration component 3 can be removed to avoid affecting subsequent testing of the optical performance of the metasurface lens 20.

[0043] During the test process, first, the base 21 is assembled on the test carrier plate 1, and the CCD calibration component 3 is started. The image of the first aperture 212 on the base 21 is captured through the CCD lens, and the center position of the first aperture 212 is accurately determined and marked on the CCD display interface. Then, the to-be-tested metasurface lens 20 is placed in the lens mounting groove 211. By adjusting the position of the metasurface lens 20, the pattern center of the metasurface lens 20 is accurately aligned with the center of the first aperture 212 marked by the CCD. Since the metasurface lens 20 itself has recognizable pattern features on its surface, the positioning operation of the metasurface lens 20 can be completed quickly and accurately.

[0044] After the positioning of the metasurface lens 20 is completed, the cover plate 22 is installed on the base 21. The second aperture 221 on the cover plate 22 is accurately aligned with the first aperture 212, thereby ensuring that the optical axis of the metasurface lens 20 is highly coaxial with the optical path system of the optical test mechanism, and ensuring the test accuracy and reliability.

[0045] See Figures 3 to 6 and Figure 8 As shown, the lens fixture 2 further includes a limiting structure 23. The limiting structure 23 includes a protrusion 231 and a clamping groove 232 that cooperate with each other. One of the protrusion 231 and the clamping groove 232 is provided on the base 21, and the other of the protrusion 231 and the clamping groove 232 is provided on the cover plate 22. Through the mutually cooperating protrusion 231 and clamping groove 232, the rapid positioning and alignment assembly of the cover plate 22 and the base 21 can be achieved, and the cover plate 22 can be prevented from moving relative to the base 21 in the direction parallel to the test carrier plate 1, thereby ensuring the axis stability of the aperture.

[0046] In this embodiment, the protrusion 231 is provided on the base 21, and the clamping groove 232 is provided on the cover plate 22.

[0047] In other embodiments, the protrusion 231 can also be provided on the cover plate 22, and the clamping groove 232 is provided on the base 21.

[0048] See Figures 3 to 6 and Figure 8 As shown, in this embodiment, both the protrusion 231 and the clamping groove 232 are annular. The protrusion 231 extends into the clamping groove 214, and the lens mounting groove 211 is located inside the clamping groove 232. Through the nested design of the annular protrusion 231 and the clamping groove 232, uniform radial restraint force can be provided, stress concentration can be dispersed, and the assembly fastness of the protrusion 231 and the clamping groove 232 can be improved; the lens mounting groove 211 is located inside the clamping groove 232 and also inside the protrusion 231. That is, the metasurface lens 20 can be surrounded by the protrusion 231 and the clamping groove 232, which can reduce the interference to the optical path.

[0049] Preferably, both the protrusion 231 and the clamping groove 232 are annular, which is more conducive to the assembly of the two.

[0050] Refer Figures 3 to 6 and Figure 8 As shown, in addition, the base 21 further includes a mounting boss 213, the mounting boss 213 is located inside the protrusion 231, and the lens mounting groove 211 is provided on the mounting boss 213. Correspondingly, the cover plate 22 is provided with a notch 222 corresponding to the mounting boss 213, so that the mounting boss 213 can extend into the notch 222 and the mounting boss 213 can be limited.

[0051] Among them, there is a gap between the mounting boss 213 and the protrusion 231, and the part of the cover plate 22 between the notch 222 and the clamping groove 232 can be caught in this gap, thereby further strengthening the assembly firmness and mutual limitation between the base 21 and the cover plate 22.

[0052] Refer Figure 3 As shown, a groove 214 is provided at the bottom of the lens mounting groove 211, and the first aperture 212 is located in the area where the groove 214 is located. In this way, there is a gap between the first aperture 212 and the metasurface lens 20.

[0053] Refer Figures 6 to 7 As shown, an infrared filter 24 is provided at the bottom of the groove 214 corresponding to the first aperture 212. In this way, there is also a gap between the infrared filter 24 and the metasurface lens 20. In practical applications, the infrared filter 24 can be pre-bonded to the bottom of the groove 214, so as to block non-target bands from entering the optical test mechanism, suppress interference, ensure effective signal acquisition, and improve the signal-to-noise ratio.

[0054] The cover plate 22 is provided with an anti-reflection filter corresponding to the second aperture 221, which can reduce the loss of light energy reflected from the surface of the cover plate 22, reduce the interference of stray light on the CCD imaging, and improve the contrast.

[0055] Refer Figure 3 As shown, specifically, the lens mounting groove 211 includes a lens mounting area 2111 and an operation area 2112, and the operation area 2112 is recessed in a direction away from the cover plate 22 relative to the lens mounting area 2111. The lens mounting area 2111 is used to place the metasurface lens 20. The operation area 2112 is recessed in a direction away from the cover plate 22 relative to the lens mounting area 2111, providing an operation space for tools, which can facilitate the placement of the metasurface lens 20 in the lens mounting area 2111 and the removal of the metasurface lens 20.

[0056] There are a pair of operation areas 2112, which are respectively located on opposite sides of the lens mounting area 2111. The bilateral layout of the pair of operation areas 2112 improves the convenience of loading and unloading the metasurface lens 20.

[0057] Preferably, a pair of operation areas 2112 extend towards each other to the lens mounting area 2111, and the first aperture 212 is located between the pair of operation areas 2112. In this way, it is not only convenient for tools to reach under the metasurface lens 20 for operation, but also avoids affecting the first aperture 212.

[0058] In this embodiment, the lens mounting area 2111 is square to fit the square metasurface lens. In other embodiments, the lens mounting area 2111 can also be circular to fit the circular metasurface lens.

[0059] The shape of the operation area 2112 is not limited and can be square, circular, or irregular.

[0060] Refer Figures 6 to 7 As shown, an assembly groove 215 is provided on the side of the base 21 facing away from the cover plate 22, and an assembly boss 11 is provided at one end of the test carrier 1 facing the lens fixture 2. The assembly boss 11 is fitted into the assembly groove 215. The quick positioning and installation of the base 21 and the test carrier 1 can be achieved through the cooperation of the assembly groove 215 and the assembly boss 11.

[0061] Preferably, the assembly boss 11 is circular, and the assembly groove 215 is also correspondingly circular, so as to disperse stress, avoid deformation of the assembly boss 11 or the assembly groove 215 caused by local stress, and improve the connection stability between the lens fixture 2 and the test carrier 1.

[0062] In summary, for the metasurface lens test tooling 10 of the present application, by simulating the state of the metasurface lens 20 in the optical system with the lens fixture 2, placing the lens fixture 2 on the test carrier 1, and using the high-precision calibration function of the CCD calibration component 3 to calibrate the first aperture 212 on the base 21, the pattern center of the metasurface lens 20, the second aperture 221 on the cover plate 22 and the first aperture 212 are aligned, eliminating the installation deviation, ensuring the accurate alignment of the pattern center of the metasurface lens 20 and the optical path. Thus, under the condition of not needing to be assembled into a complete optical system as a whole, the optical performance parameters such as transmittance, focusing efficiency, FOV, FNO, EFL, OPTTL, Distortion, MTF, etc. of the metasurface lens 20 assembled on the test carrier 1 can be tested, and the accuracy of the optical performance test is greatly improved. It effectively solves the problems of high cost, long cycle and low iteration efficiency caused by the need to assemble the lens as a whole before evaluation in traditional optical performance tests, greatly reduces the cost and cycle of performance testing, improves the design and development efficiency of products, and meets the actual needs of rapid iterative analysis.

[0063] The structure, features and effects of this application have been described in detail above with reference to the embodiments shown in the accompanying drawings. The above description is only a preferred embodiment of this application, but this application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of this application, or modifications to equivalent embodiments with equivalent changes, that do not exceed the spirit covered by the specification and drawings, should be within the protection scope of this application.

Claims

1. A testing fixture for metasurface lenses, characterized in that, include: Test carrier board; A lens fixture is assembled on the test carrier plate. The lens fixture includes a base and a cover plate that cooperate with each other. The base is provided with a lens mounting groove, and the bottom of the lens mounting groove is provided with a first aperture hole. The cover plate is provided with a second aperture hole. The CCD calibration component is used to calibrate the first aperture and align the pattern center of the lens, the second aperture, and the first aperture.

2. The metasurface lens testing fixture according to claim 1, characterized in that, The CCD calibration component is located above the test substrate and can move relative to the test substrate.

3. The metasurface lens testing fixture according to claim 1, characterized in that, The lens clamp also includes a limiting structure, which includes a protrusion and a locking groove that cooperate with each other. One of the protrusion and the locking groove is located on the base, and the other of the protrusion and the locking groove is located on the cover plate.

4. The metasurface lens testing fixture according to claim 3, characterized in that, Both the protrusion and the snap-fit ​​groove are annular, with the protrusion extending into the snap-fit ​​groove and the lens mounting groove located inside the snap-fit ​​groove.

5. The metasurface lens testing fixture according to claim 1, characterized in that, The bottom of the lens mounting slot is provided with a groove, the first aperture is located in the area of ​​the groove, and an infrared filter is provided at the bottom of the groove corresponding to the first aperture.

6. The metasurface lens testing fixture according to claim 1, characterized in that, An anti-reflection filter is provided on the cover plate corresponding to the second aperture.

7. The metasurface lens testing fixture according to claim 1, characterized in that, The lens mounting groove includes a lens mounting area and an operating area, wherein the operating area is recessed relative to the lens mounting area in a direction away from the cover plate.

8. The metasurface lens testing fixture according to claim 7, characterized in that, The operation area is provided in pairs and is located on opposite sides of the lens mounting area.

9. The metasurface lens testing fixture according to claim 1, characterized in that, The base has an assembly groove on the side away from the cover plate, and the test plate has an assembly boss on the end facing the lens fixture, the assembly boss being fitted into the assembly groove.

10. The metasurface lens testing fixture according to claim 9, characterized in that, The assembly slot is circular.

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