Free-form surface optical lens detection device

Abstract

The utility model relates to the field of optical lens detection, in particular to a free-form surface optical lens detection device, which comprises a shell, the shell comprises an upper shell and a lower shell, the bottom surface of the upper shell is provided with a camera light through hole, and the top surface of the lower shell is provided with a display screen light through hole; the camera is mounted in the upper shell; the lens flexible clamping ring is used for flexibly clamping the free-form surface optical lens to be detected; the clamping ring positioning mechanism is mounted on the periphery of the light through hole of the display screen and used for clamping and positioning the lens flexible clamping ring; the display screen is mounted in the lower shell; the display screen is used for projecting sine fringes, and the sine fringes are collected by the camera after being modulated by the free-form surface optical lens. According to the utility model, the stress deformation generated when the free-form surface optical lens is clamped is effectively reduced, and the measurement error caused by the deformation of the free-form surface optical lens is avoided, so that the accuracy and the reliability of the detection result are obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical lens detection technical field, especially relate to a kind of free-form optical lens detection device. BACKGROUND

[0002] With the deep integration of ophthalmic technology and consumer electronics industry, free-form optical lens has irreplaceable advantages in aberration correction, personalized visual demand satisfaction and other aspects by virtue of the complex surface design of non-rotational symmetry, and has been widely used in myopia glasses, VR / AR optical module, vehicle-mounted display system and other fields. The core performance of free-form optical lens depends on the extremely high surface accuracy and optical parameter stability, and the detection error of its spherical power, cylinder power, cylinder axis and other key indicators needs to be controlled in micron level or even sub-micron level, otherwise it will directly affect the imaging quality of subsequent optical system or the visual correction effect of wearer.

[0003] In the detection process of free-form optical lens, the clamping method of the lens has important influence on detection accuracy. The traditional lens clamping method mostly adopts rigid fixed structure, such as mechanical clamp or vacuum adsorption device, which can realize stable positioning of the lens, but uneven stress is easily applied to the lens during clamping, resulting in micro-deformation of the lens. This stress deformation caused by clamping can change the actual surface of the lens, especially in free-form optical lens which requires extremely high surface accuracy, even micron-level deformation will significantly affect the accuracy of detection results. SUMMARY

[0004] Therefore, the utility model creates to provide a kind of free-form optical lens detection device to solve the technical problem that rigid fixed structure clamps free-form optical lens and easily causes lens deformation.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model creation is as follows:

[0006] A kind of free-form optical lens detection device, comprising:

[0007] The shell includes an upper shell and a lower shell, a camera light hole is formed in the bottom surface of the upper shell, and a display screen light hole is formed in the top surface of the lower shell;

[0008] The camera is installed in the upper shell;

[0009] The lens flexible clamping ring is used for flexible clamping of the free-form optical lens to be measured;

[0010] The clamping ring positioning mechanism is installed on the periphery of the display screen light hole, and is used for clamping and positioning the lens flexible clamping ring;

[0011] The display screen is installed in the lower housing; the display screen is used to project sinusoidal fringes, and the sinusoidal fringes are collected by the camera after being modulated by the free-form optical lens.

[0012] Further, the lens flexible clamping ring comprises a clamping ring body, a fixed adapter and a plurality of elastic pieces, the elastic pieces are uniformly distributed along the circumference of the clamping ring body, and each elastic piece is fixed on the clamping ring body through a corresponding fixed adapter.

[0013] Further, the fixed adapter comprises a fixed part and an adapter part, the lower end of the fixed part is connected with the clamping ring body, the upper end of the fixed part is connected with the adapter part, and the elastic piece is fixed on the adapter part.

[0014] Further, the fixed part is a double-headed stud, the adapter part is a block structure, a threaded hole is formed on the upper surface of the clamping ring body and the lower surface of the adapter part respectively, the lower end of the fixed part is threadedly connected with the threaded hole of the clamping ring body, and the upper end of the fixed part is threadedly connected with the threaded hole of the adapter part.

[0015] Further, the elastic piece is fixed on the adapter part through a screw.

[0016] Further, the display screen light transmission hole is a stepped hole, a transparent sealing piece is fixed on the stepped surface of the display screen light transmission hole, the transparent sealing piece is located below the three-jaw clamping mechanism and is used to seal the lower housing.

[0017] Further, the transparent sealing piece is made of optical glass, optical plastic or optical crystal.

[0018] Further, the clamping ring positioning mechanism comprises a fixed ring, a rotating ring rotatably embedded in the fixed ring and a clamping part for clamping and positioning the lens flexible clamping ring.

[0019] The clamping part comprises three clamping arms uniformly arranged along the circumference of the fixed ring,

[0020] One end of the clamping arm is provided with a rotating shaft display screen light transmission hole and a long strip-shaped guide groove extending in the length direction, and the other end serves as a clamping end for clamping the lens flexible clamping ring.

[0021] The end surface of the rotating ring is provided with rotating shafts corresponding to the three clamping arms respectively.

[0022] The end surface of the fixed ring is provided with guide pins corresponding to the three clamping arms respectively.

[0023] The clamping arm is rotatably installed on the rotating ring through the rotation shaft display screen through hole matched with the corresponding rotation shaft, and the corresponding guide pin is movably arranged in the guide groove, so that the clamping end moves towards or away from the center of the rotating ring, thereby clamping or releasing the flexible clamping ring of the lens.

[0024] Further, the clamping ring positioning mechanism further comprises a rotating ring driving member for driving the rotating ring to rotate relative to the fixed ring, and the rotating ring driving member comprises a nut shaft, a rotating screw rod and a rotating knob.

[0025] The side of the rotating ring is provided with a rotating screw rod mounting groove which is matched with the shape of the rotating screw rod and extends in the circumferential direction, and the two side walls of the rotating screw rod mounting groove are provided with nut shaft display screen through holes matched with the shape of the nut shaft.

[0026] The two ends of the nut shaft are movably inserted into the two nut shaft display screen through holes,

[0027] The middle part of the nut shaft is provided with a screw rod display screen through hole which is arranged in the radial direction and matched with the rotating screw rod.

[0028] The side of the fixed ring is provided with a screw rod through hole matched with the shape of the rotating screw rod.

[0029] One end of the rotating screw rod is inserted into the screw rod display screen through hole, and the other end passes through the screw rod through hole and is provided with a rotating knob.

[0030] Further, a lifting platform is arranged at the bottom of the lower housing, and the top of the lifting platform is fixedly connected with the back of the display screen, and the distance between the display screen and the free-form optical lens is adjusted through the lifting platform.

[0031] Compared with the prior art, the utility model creation can achieve the following beneficial effects:

[0032] The utility model discloses a flexible clamping ring with elasticity is used to flexibly clamp the free-form optical lens, effectively avoids the stress deformation when clamping the free-form optical lens, and further avoids the measurement error caused by the deformation of the free-form optical lens, thereby significantly improving the accuracy and reliability of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings forming a part of the utility model creation are used to provide further understanding of the utility model creation, and the illustrative embodiment of the utility model creation and its explanation are used to explain the utility model creation, and do not constitute improper limitation to the utility model creation.

[0034] Figure 1 The overall structure schematic diagram of the free-form optical lens detection device is described in the utility model creation embodiment.

[0035] Figure 2 The overall structure schematic diagram of the clamping ring positioning mechanism according to the utility model creation embodiment;

[0036] Figure 3 The overall structure schematic diagram of the clamping ring positioning mechanism according to the utility model creation embodiment;

[0037] Figure 4 The overall structure schematic diagram of the clamping ring positioning mechanism according to the utility model creation embodiment;

[0038] Explanation of reference signs: shell 1, support frame 11, sheet metal 12, cross brace 13, camera 2, clamping ring positioning mechanism 3, fixed ring 31, rotating guide groove 311, lead screw through hole 312, rotating ring 32, rotating guide strip 321, rotating lead screw mounting groove 322, lead nut shaft mounting hole 323, rotating ring driving part 33, lead nut shaft 331, rotating lead screw 332, knob seat 333, knob seat through hole 333a, rotating knob 334, clamping part 34, clamping arm 341, pivot mounting hole 341a, guide groove 341b, pivot 342, guide pin 343, clamping wheel 344, clamping wheel mounting bolt 344a, lens flexible clamping ring 4, clamping ring body 41, fixed adapter 42, fixed part 421, adapter part 422, spring 43, display screen 5, lifting platform 6. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the utility model creation more clear and obvious, the utility model creation is further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model creation, and do not constitute a limitation on the utility model creation.

[0040] It should be noted that the embodiments in the utility model creation and the features in the embodiments can be combined with each other without conflict.

[0041] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0042] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0043] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] As Figure 1 shown, the utility model embodiment provides a kind of free-form optical lens detection device, including shell 1, camera 2, clamping ring positioning mechanism 3, lens flexible clamping ring 4 and display screen 5.

[0045] Shell 1 includes support frame 11 and sheet metal 12, sheet metal 12 is fixed on the four side walls of support frame 11, support frame 11 is closed, realizes the protection to device placed in the inside of support frame 11. In order to show the structure installed in shell 1, Figure 1 Only part of support frame 11 and sheet metal 12 are shown.

[0046] Shell 1 is divided into upper shell and lower shell connected, an installation space is formed between upper shell and lower shell, for installing clamping ring positioning mechanism 3 and lens flexible clamping ring 4.

[0047] A cross brace 13 is installed inside the upper shell, a camera light hole is formed on the bottom surface of the upper shell corresponding to the position of the camera 2, the camera 2 is fixed on the cross brace 13, and the lens of the camera 2 faces the camera light hole.

[0048] The display screen 5 is fixed inside the lower shell, a display screen light hole is formed on the top surface of the lower shell corresponding to the position of the camera light hole, the clamping ring positioning mechanism 3 and the lens flexible clamping ring 4 are both hollow ring structures, the stripes projected by the display screen 5 are collected by the camera 2 above, the lens flexible clamping ring 4 is clamped in the inner ring of the clamping ring positioning mechanism 3, and the clamping ring positioning mechanism 3 is installed on the periphery of the display screen light hole.

[0049] The clamping ring positioning mechanism 3 is fixed on the top surface of the lower shell by screws, and is used for clamping and fixing the lens flexible clamping ring 4.

[0050] As shown in Figure 2 and Figure 3 , the clamping ring positioning mechanism 3 comprises a fixed ring 31, a rotating ring 32, a rotating ring driving part 33, and a clamping part 34.

[0051] The fixed ring 31 is a circular ring, and a rotating guide groove 311 in the form of a ring is arranged on the inner side wall. A screw rod through hole 312 is arranged on the side.

[0052] The rotating ring 32 is a circular ring matching the shape of the fixed ring 31, and is rotatably embedded in the inside of the fixed ring 31. A plurality of rotating guide strips 321 are arranged on the inner side wall of the rotating ring 32, which are uniformly spaced along the circumference of the rotating ring 32 and match the rotating guide groove 311. The rotating ring 32 is rotatably installed in the inside of the fixed ring 31 by being arranged in the rotating guide groove 311 through the rotating guide strips 321. The side of the rotating ring 32 is provided with a rotating screw rod installation groove 322 extending along the circumference thereof, and the two side walls of the rotating screw rod installation groove 322 are provided with screw nut shaft installation holes 323.

[0053] The rotating ring driving member 33 is used to drive the rotating ring 32 to rotate relative to the fixed ring 31, and the rotating ring driving member 33 comprises a nut shaft 331, a rotating screw 332, a knob seat 333 and a rotating knob 334. The two ends of the nut shaft 331 are movably inserted into the two nut shaft mounting holes 323 respectively, and the middle part of the nut shaft 331 is provided with a screw rod mounting hole arranged along the radial direction thereof and matched with the rotating screw 332; the knob seat 333 is arranged at the side of the fixed ring 31 at the position of the screw rod through hole 312, and is provided with a knob seat through hole 333a corresponding to the screw rod through hole 312; one end of the rotating screw 332 is located in the rotating screw mounting groove 322 and is inserted into the screw rod mounting hole of the nut shaft 331, and the other end is sequentially inserted into the screw rod through hole 312 and the knob seat through hole 333a of the knob seat 333 and extends out of the knob seat 333, and is provided with the rotating knob 334. The rotating knob 334 is rotated to drive the rotating screw 332 to rotate, and then the nut shaft 331 drives the rotating ring 32 to rotate in the fixed ring 31.

[0054] The clamping part 34 is used to clamp the lens flexible clamping ring 4, and comprises three clamping arms 341, three rotating shafts 342, three guide pins 343 and three clamping wheels 344.

[0055] The three clamping arms 341 are uniformly arranged along the circumferential direction of the fixed ring 31 and the rotating ring 32; one end of the clamping arm 341 is mounted on the rotating ring 32, and the end is provided with a rotating shaft mounting hole 341a and a long strip-shaped guide groove 341b extending along the length direction thereof; the other end of the clamping arm 341 is used as a clamping end for clamping the lens flexible clamping ring 4.

[0056] The three rotating shafts 342 correspond to the three clamping arms 341 respectively, and are arranged on the end face of the rotating ring 32. The clamping arm 341 is rotatably mounted on the rotating ring 32 by inserting the corresponding rotating shaft 342 into the rotating shaft mounting hole 341a. In this embodiment, the outer part of the rotating shaft 342 is further sleeved with a copper sleeve.

[0057] The three guide pins 343 correspond to the three clamping arms 341 respectively, and are arranged on the end face of the fixed ring 31. The clamping arm 341 is mounted on the rotating ring 32 by matching the rotating shaft 342 and the rotating shaft mounting hole 341a, and the corresponding guide pin 343 is movably inserted into the guide groove 341b on the clamping arm 341, so that when the rotating ring 32 rotates, the clamping arm 341 rotates around the rotating shaft 342 under the guidance of the guide pin 343, and then the clamping end of the clamping arm 341 moves towards the center of the fixed ring 31 and the rotating ring 32 to clamp the lens flexible clamping ring 4, or the clamping end of the clamping arm 341 moves away from the center of the fixed ring 31 and the rotating ring 32 to release the lens flexible clamping ring 4.

[0058] Three clamping wheels 344 are respectively installed on the clamping ends of the three clamping arms 341 for clamping the lens flexible clamping ring 4. The clamping wheel 344 has a shape matched with the shape of the lens flexible clamping ring 4, and is installed on the clamping end of the clamping arm 341 through a clamping wheel mounting bolt 344a.

[0059] As shown in Figure 4 The lens flexible clamping ring 4 includes a clamping ring body 41, a fixed adapter 42, and a plurality of elastic pieces 43. The elastic pieces 43 are uniformly distributed along the circumference of the clamping ring body 41, and each elastic piece 43 is fixed to the clamping ring body 41 through a corresponding fixed adapter 42. The flexible clamping of the free-form optical lens is realized through the elastic pieces 43 uniformly distributed along the clamping ring body 41.

[0060] The elastic piece 43 has elasticity, which can effectively reduce the stress deformation when clamping the free-form optical lens, avoid the measurement error caused by the deformation of the free-form optical lens, and significantly improve the accuracy and reliability of the detection result. This flexible fixing method can ensure that the mirror surface of the free-form optical lens remains unchanged during the detection process, and is suitable for high-precision surface detection.

[0061] The fixed adapter 42 includes a fixed part 421 and an adapter part 422. The fixed part 421 is a double-headed stud, and the adapter part 422 is a block structure. Threaded holes are respectively formed on the upper surface of the clamping ring body 41 and the lower surface of the adapter part 422. The lower end of the fixed part 421 is threadedly connected with the threaded hole of the clamping ring body 41, and the upper end of the fixed part 421 is threadedly connected with the threaded hole of the adapter part 422. The elastic piece 43 is fixed to one side of the adapter part 422 facing the free-form optical lens through a screw.

[0062] In order to prevent the surface of the display screen 5 from falling into impurities, a transparent sealing piece is installed in the display screen light hole. Specifically, the display screen light hole is a stepped hole, and the transparent sealing piece is glued on the stepped surface of the display screen light hole, thereby sealing the lower housing.

[0063] The transparent sealing piece is selected from optical glass, optical plastic, or optical crystal with high visible light transmittance. The optical glass can be Schott N-BK7, Chengdu Guangming H-K9L, etc. The optical plastic can be polycarbonate, polymethyl methacrylate, etc. The optical crystal can be sapphire, quartz, magnesium oxide, and rutile, etc.

[0064] The display screen 5 and the camera 2 are powered through external wires. The external wires of the display screen 5 and the camera 2 are connected to the upper computer.

[0065] Under the control of the host computer, the display screen 5 generates sinusoidal stripes and projects them upwards. The sinusoidal stripes are modulated by the freeform surface optical lens and then captured by the camera 2. After capturing the stripe image, the camera 2 transmits it to the host computer for further processing.

[0066] The detection principle of the freeform surface optical lens detection device is phase measurement deflectometry. Since phase measurement deflectometry is a known technique, the process of the host computer processing the fringe image is also a known technique. Therefore, the technical solution of this utility model relies on a known computer program for implementation, and thus meets the protection requirements of a utility model.

[0067] A lifting platform 6 is also placed at the bottom inside the lower housing. The top of the lifting platform 6 is fixed to the back of the display screen 5 with screws. The lifting platform 6 drives the display screen 5 to rise and fall, adjusting the distance between the display screen 5 and the freeform optical lens.

[0068] The purpose of setting up the lifting platform 6 is as follows:

[0069] 1. Optimize stripe projection angle and density

[0070] The curvature of a freeform optical lens varies considerably across different regions. By adjusting the height of the display screen 5, the incident angle of the fringe light projected onto the lens surface can be changed. This helps ensure a clear, moderately contrasting, and uniformly distributed fringe image across the entire lens surface. If the fringe is too dense or too sparse, it will affect the accuracy of camera 2's capture and subsequent phase calculations.

[0071] 2. Lenses adaptable to different curvatures and sizes

[0072] Freeform optical lenses with different prescriptions and designs (such as high astigmatism and progressive multifocal lenses) exhibit significant differences in surface curvature. The lifting platform 6 allows the display screen 5 to be moved to the optimal working distance. For freeform optical lenses with greater curvature, adjusting the display screen 5 closer to the lens can prevent excessive compression or loss of stripes at the lens edges; for flatter freeform optical lenses, the display screen 5 can be adjusted further away from the lens to cover a larger effective detection area.

[0073] 3. Ensure the dynamic range and accuracy of phase measurement.

[0074] The core of the phase-deflection method is to calculate the normal direction of the lens surface by analyzing the distortion of the fringes, and then reconstruct the surface shape. The amount of fringe distortion caused by the same lens varies depending on the position of display screen 5. By adjusting the position of display screen 5, the distortion can be controlled within the optimal range of camera resolution and algorithm processing, avoiding problems such as phase wrapping or excessively low signal-to-noise ratio.

[0075] In a specific embodiment of this utility model, the display screen 5 is an Ehomewei Q1pro model display manufactured by Shenzhen Yihong Microelectronics Co., Ltd., and the lifting platform 6 is a ZMT-100H model lifting device manufactured by Shanghai Lianyi Fiber Laser Instrument Co., Ltd.

[0076] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this utility model can be achieved, and this is not limited herein.

[0077] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for testing a freeform optical lens, characterized in that, The application relates to a camera lens testing device. The camera lens testing device comprises a housing, a camera, a lens flexible clamping ring, a clamping ring positioning mechanism and a display screen. The housing comprises an upper shell and a lower shell, a camera light hole is arranged on the bottom surface of the upper shell, and a display screen light hole is arranged on the top surface of the lower shell. The camera is arranged in the upper shell. The lens flexible clamping ring is used for flexibly clamping a free-form optical lens to be tested. The clamping ring positioning mechanism is arranged on the periphery of the display screen light hole and is used for clamping and positioning the lens flexible clamping ring.

2. The freeform optical lens testing device of claim 1, wherein, The display screen is arranged in the lower shell and is used for projecting a sinusoidal fringe.

3. The freeform optical lens testing device of claim 2, wherein, The lens flexible clamping ring comprises a clamping ring body, fixed adapters and elastic sheets.

4. The freeform optical lens testing device of claim 3, wherein, The number of the elastic sheets is the same as that of the fixed adapters, and the elastic sheets are uniformly distributed along the circumference of the clamping ring body.

5. The freeform optical lens testing device of claim 3, wherein, Each elastic sheet is fixed on the clamping ring body through a corresponding fixed adapter.

6. The freeform optical lens testing device of claim 1, wherein, The flexible clamping of the free-form optical lens is realized through the elastic sheets uniformly distributed along the clamping ring body.

7. The freeform optical lens testing device of claim 6, wherein, The fixed adapter comprises a fixed part and an adapter part.

8. The freeform optical lens testing device of claim 1, wherein, The lower end of the fixed part is connected with the clamping ring body, the upper end of the fixed part is connected with the adapter part, and the elastic sheet is fixed on the adapter part. The fixed part is a double-end stud, and the adapter part is a block structure. Screw holes are respectively arranged on the upper surface of the clamping ring body and the lower surface of the adapter part. The lower end of the fixed part is screw-connected with the screw hole of the clamping ring body, and the upper end of the fixed part is screw-connected with the screw hole of the adapter part. The elastic sheet is fixed on the adapter part through a screw. The display screen light hole is a stepped through hole.

9. The freeform optical lens testing device of claim 8, wherein, A transparent sealing piece is fixed on the stepped surface of the display screen light hole. The transparent sealing piece is arranged below the three-jaw clamping mechanism and is used for sealing the lower shell. The transparent sealing piece is made of optical glass, optical plastic or optical crystal. The clamping ring positioning mechanism comprises a fixed ring, a rotating ring rotatably embedded in the fixed ring and a clamping part used for clamping and positioning the lens flexible clamping ring. The clamping part comprises three clamping arms uniformly arranged along the circumference of the fixed ring. One end of the clamping arm is provided with a rotating shaft display screen light hole and a long strip-shaped guide groove extending along the length direction. The other end of the clamping arm is used as a clamping end for clamping the lens flexible clamping ring. The end surface of the rotating ring is provided with rotating shafts corresponding to the three clamping arms. The end surface of the fixed ring is provided with guide pins corresponding to the three clamping arms. The clamping arm is rotatably arranged on the rotating ring through the rotating shaft display screen light hole matched with the corresponding rotating shaft. The corresponding guide pin is movably arranged in the guide groove. The clamping end moves towards or away from the center of the rotating ring, so that the lens flexible clamping ring is clamped or released. The clamping ring positioning mechanism further comprises a rotating ring driving part used for driving the rotating ring to rotate relative to the fixed ring. The rotating ring driving part comprises a nut shaft, a rotating screw rod and a rotating knob. The side part of the rotating ring is provided with a rotating screw rod mounting groove matched with the shape of the rotating screw rod and extending along the circumference. The two side walls of the rotating screw rod mounting groove are provided with nut shaft display screen light holes matched with the shape of the nut shaft. The two ends of the nut shaft are movably inserted into the two nut shaft display screen light holes. The middle part of the nut shaft is provided with a screw rod display screen light hole arranged along the radial direction and matched with the rotating screw rod. The side of the fixing ring is provided with a screw rod through hole matched with the shape of the rotating screw rod; One end of the rotating screw rod is inserted into the screw rod display screen through hole, and the other end passes through the screw rod through hole and is provided with a rotating knob.

10. The freeform optical lens testing device of claim 1, wherein, A lifting platform is arranged at the bottom in the lower shell, and the top of the lifting platform is fixedly connected with the back of the display screen. The distance between the display screen and the free-form optical lens is adjusted through the lifting platform.

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