Device and method for measuring center thickness of lens

Abstract

The present invention discloses a device and method for measuring the center thickness of a lens, and relates to the field of lens center measurement technology. The device includes a clamping mechanism for fixing the lens and a testing mechanism for detecting the thickness of the lens. The clamping mechanism includes: a support frame, a mounting frame fixed on the support frame; a reel, the reel rotatably mounted on the mounting frame; a connecting rope, the ends of the connecting rope being respectively fixed to two reeling wheels, the connecting rope being provided with equidistantly distributed annular members; a clamping roller, the clamping roller being rotatably mounted within the annular member, the connecting rope with the clamping roller being reeled around the circumferential outer walls of the two reeling wheels. By providing a clamping mechanism, the present invention forms the effect of multiple clamping rollers fixing the lens during clamping. This method is suitable for lenses of different diameters. Moreover, due to the use of multi-point support, the fixation is reliable, and the clamping roller is rotatable, thereby avoiding wear on the lens during the clamping process, and having strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of lens center measurement, and in particular to a device and method for measuring the center thickness of a lens. Background Art

[0002] In optical systems, the center thickness of a lens is an important optical distance. Deviations in the center thickness of a lens affect the focus position and imaging quality. In optical processing, the center thickness of a lens is typically measured using a micrometer, thickness gauge, or dial indicator. The lens must be securely fixed before measurement. Only when the measuring head contacts the thickest point in the center of a positive lens, or the thinnest point in the center of a negative lens, can the center thickness of the lens be accurately measured.

[0003] For example, in the case of a concave lens, the center point of the concave surface is usually the lowest point, making it difficult for the measuring head to find the exact center. This results in large deviations and inaccurate measurements. Multiple measurements are often performed to find the center position, and the judgment is made by observing whether the measured data is the minimum or maximum value. This results in slow measurement speed, and multiple searches can easily damage the surface.

[0004] In the prior art, measuring instruments used to detect the center of a lens use a clamping mechanism. The clamping mechanism includes a fixing member with a fixing hole and a groove for accommodating the lens. The bottom of the groove has a through-hole. A limiter is also mounted on the fixing member, adjacent to the groove, to ensure that the lens is clamped between the bottom of the groove and the limiter. This structure, during the lens clamping process, suffers from an inability to properly secure lenses of varying diameters. This results in significant limitations in product size requirements during measurement, and this remains to be improved. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device and method for measuring the center thickness of a lens.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for measuring the center thickness of a lens, comprising a clamping mechanism for fixing the lens and a testing mechanism for detecting the thickness of the lens, wherein the clamping mechanism comprises:

[0008] a support frame, wherein a mounting frame is fixed on the support frame;

[0009] A reel is rotatably mounted on the mounting frame;

[0010] A connecting rope, with both ends of the connecting rope fixed to two reel wheels, and annular parts distributed at equal distances are provided on the connecting rope;

[0011] The clamping roller is rotatably mounted in the annular member, and the connecting rope with the clamping roller is wound around the outer circumference of the two winding wheels;

[0012] An auxiliary pressing assembly is also provided below the winding wheel to enable the connecting rope to fit onto the lens to be tested; a one-way limiting assembly for fixing the winding wheel is also provided on one side of the winding wheel.

[0013] Preferably, a limiting body is provided at one end of the clamping roller away from the annular member, and the diameter of the limiting body is larger than the diameter of the clamping roller.

[0014] Further: the auxiliary pressing component includes:

[0015] A movable frame, the top of which is slidably connected to the inner wall of one side of the mounting frame;

[0016] A first spring, wherein the top end of the first spring is fixed to the mounting frame, and the bottom end of the first spring is fixed to the movable frame;

[0017] The pressing wheel is rotatably mounted on the movable frame, and the thickness of the pressing wheel is smaller than the distance between the two ends of the clamping roller.

[0018] Further preferably: the one-way limiting component includes:

[0019] A side bracket is fixed to an outer wall of one side of the mounting frame;

[0020] A support rod, the support rod is fixed to the side wall of the bottom end of the side bracket;

[0021] A one-way limiting wheel is slidably connected to the outer wall of the support rod. A movable one-way limiting spring tooth is installed on the circumferential outer wall of the one-way limiting wheel through a built-in spring. One side of the one-way limiting spring tooth is a flat structure, and the other side of the one-way limiting spring tooth is an inclined structure.

[0022] A second spring, with both ends of the second spring respectively fixed to the one-way limiting wheel and the side bracket;

[0023] The inner circumferential wall of the winding wheel is provided with evenly distributed convex teeth, and the convex teeth and the one-way limiting spring teeth form a one-way limiting effect.

[0024] As a preferred embodiment of the present invention, the device further includes a shooting and positioning mechanism, which includes:

[0025] a first horizontal adjustment assembly, on which a first vertical adjustment assembly is mounted;

[0026] a first lifting frame, the first lifting frame being mounted on the first vertical adjustment assembly;

[0027] A CCD assembly is mounted on the top outer wall of the first lifting frame, and is used to identify the circular contour of the lens;

[0028] A dot mark for identification by the CCD component is provided at the center of the end face of the limiting body.

[0029] As a further preferred embodiment of the present invention: the testing mechanism includes:

[0030] a second horizontal adjustment assembly, on which a second vertical adjustment assembly is mounted;

[0031] a second lifting frame, the second lifting frame being mounted on the second vertical adjustment assembly;

[0032] A bracket, the bracket being fixed to an outer wall of one side of the second lifting frame;

[0033] Testing parts: two testing parts are symmetrically installed on the second lifting frame and the bracket.

[0034] As a further solution of the present invention: the testing unit includes:

[0035] Translation blocks, the two translation blocks are slidably connected to the second lifting frame and the inner wall of the bracket respectively, and scale lines are set on the translation blocks;

[0036] A mounting plate fixed to the top outer wall of the translation block;

[0037] Fixed frames, two fixed frames are respectively mounted on the second lifting frame and the top outer wall of the bracket;

[0038] An adjusting knob is rotatably mounted on the inner wall of the fixing frame, and the adjusting knob is connected to the inner wall of the mounting plate via a thread;

[0039] The second measuring head is mounted on the mounting plate.

[0040] Based on the above solution: a positioning ring is fixed to the outer wall of the top of the second lifting frame, and the first measuring head coincides with the central axis of the positioning ring.

[0041] Based on the above solution, preferably, the first level adjustment component and the second level adjustment component both include:

[0042] A translational slide rail, wherein a translation screw is rotatably mounted on the inner wall of one side of the translational slide rail;

[0043] The translation seat is slidably connected to the inner wall of the translation rail, and the translation screw is connected to the inner wall of the translation seat through a thread;

[0044] The first vertical adjustment component and the second vertical adjustment component both include:

[0045] A lifting guide rod is fixed to the outer wall of the top of the translation seat, and the second lifting frame and the first lifting frame are slidably connected to the outer walls of the two lifting guide rods respectively;

[0046] The lifting screw has a bottom end which is rotatably mounted on the top inner wall of the translation seat, and the second lifting frame and the first lifting frame are respectively connected to the outer walls of the two lifting screws through threads.

[0047] A method for measuring the center thickness of a lens comprises the following steps:

[0048] S1: Remove the one-way limiting wheel from the inside of the winding wheel to release the restriction on the winding wheel;

[0049] S2: Pull the connecting rope from the outer wall of the reel to a length sufficient to fix the lens;

[0050] S3: Install the one-way limiting wheel into the recovery reel;

[0051] S4: Arrange the connecting rope outside the lens, rotate the two winding wheels to wind the connecting rope, and make the connecting rope taut on the outside of the lens with the assistance of the pressing wheel;

[0052] S5: Adjust the shooting positioning mechanism, and use the CCD component to identify the circular outline of the lens and the dot mark to ensure that the center of the arc structure formed by the dot mark coincides with the center of the circular outline of the lens;

[0053] S6: Adjust the testing mechanism so that the center of the positioning ring coincides with the center of the circular contour of the lens;

[0054] S7: Measure the center thickness of the lens using the two first measuring heads.

[0055] The beneficial effects of the present invention are:

[0056] 1. The present invention provides a clamping mechanism, which forms the effect of multiple clamping rollers fixing the lens during clamping. This method is suitable for lenses of different diameters. In addition, due to the use of multi-point support, the fixation is reliable, and the clamping rollers are rotatable, which avoids wear on the lens during the clamping process and has strong practicality.

[0057] 2. The present invention, by setting up structures such as a CCD component, can identify the circular contour of the lens and the point marks of the limiter based on the CCD component. The point marks distributed on the outside of the lens can form an arc structure, which is identified, analyzed and judged by the CCD component. When the center of the arc structure formed by the point marks coincides with the center of the circular contour of the lens, it indicates that the lens is clamped accurately.

[0058] 3. The present invention provides a positioning ring, which can be used to determine the position of the first measuring head when the CCD component is shooting. When the center of the positioning ring coincides with the center of the circular contour of the lens, it indicates that the first measuring head has been positioned at the center of the lens, thereby being able to directly measure the center thickness of the lens, avoiding the situation where the lens is worn out due to multiple measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic structural diagram of a device for measuring the center thickness of a lens proposed by the present invention;

[0060] Figure 2 This is a schematic structural diagram of another angle of a device for measuring the center thickness of a lens proposed by the present invention;

[0061] Figure 3 This is a schematic structural diagram of a clamping mechanism of a device for measuring the center thickness of a lens proposed by the present invention;

[0062] Figure 4 This is a schematic structural diagram of a winding wheel and a pressing wheel of a device for measuring the center thickness of a lens proposed by the present invention;

[0063] Figure 5 This is a schematic diagram of the structure of the device for measuring the center thickness of a lens proposed by the present invention, with the winding wheel and the one-way limiting wheel separated;

[0064] Figure 6 This is a schematic structural diagram of a testing mechanism for a device for measuring the center thickness of a lens proposed in the present invention.

[0065] In the figure: 1 support frame, 2 positioning ring, 3 lifting guide rod, 4 translation seat, 5 translation slide rail, 6 translation screw, 7 lifting screw, 8 CCD assembly, 9 first lifting frame, 10 mounting frame, 11 second lifting frame, 12 movable frame, 13 clamping roller, 14 lens, 15 pressure roller, 16 winding roller, 17 side bracket, 18 second spring, 19 one-way limiting wheel, 20 connecting rope, 21 ring member, 22 first spring, 23 support rod, 24 convex tooth, 25 one-way limiting spring tooth, 26 first measuring head, 27 mounting plate, 28 second measuring head, 29 fixed frame, 30 scale line, 31 translation block, 32 bracket, 33 adjusting knob. DETAILED DESCRIPTION

[0066] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0067] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0068] Example 1:

[0069] A device for measuring the center thickness of a lens, such as Figure 1-6As shown, it includes a clamping mechanism for fixing the lens 14 and a testing mechanism for detecting the thickness of the lens 14. The clamping mechanism includes:

[0070] Support frame 1, with mounting frame 10 fixed to the support frame 1 by bolts;

[0071] The winding wheel 16 is rotatably mounted on the mounting frame 10;

[0072] A connecting rope 20, with both ends of the connecting rope 20 fixed to the two reel wheels 16, and annular members 21 equidistantly distributed are provided on the connecting rope 20;

[0073] The clamping roller 13 is rotatably mounted in the ring member 21, and the connecting rope 20 with the clamping roller 13 is wound around the outer circumference of the two winding wheels 16;

[0074] An auxiliary pressing assembly is provided below the winding wheel 16 to facilitate the connection rope 20 to fit onto the lens 14 to be tested. A one-way limiting assembly is also provided on one side of the winding wheel 16 to fix the winding wheel 16 .

[0075] To facilitate installation; Figure 3 、 Figure 4 As shown, a limiting body is integrally provided at one end of the clamping roller 13 away from the annular member 21 , and the diameter of the limiting body is larger than the diameter of the clamping roller 13 .

[0076] In order to improve the clamping strength; Figure 3 、 Figure 4 As shown, the auxiliary pressing components include:

[0077] A movable frame 12, the top of which is slidably connected to an inner wall of one side of the mounting frame 10;

[0078] A first spring 22, wherein the top end of the first spring 22 is fixed to the mounting frame 10, and the bottom end of the first spring 22 is fixed to the movable frame 12;

[0079] The pressing wheel 15 is rotatably mounted on the movable frame 12 , and the thickness of the pressing wheel 15 is smaller than the distance between the two ends of the clamping roller 13 .

[0080] In order to facilitate the fixing of the reel 16; Figure 4 、 Figure 5 As shown, the one-way limit assembly includes:

[0081] A side bracket 17, the side bracket 17 is fixed to an outer wall of one side of the mounting frame 10;

[0082] Support rod 23, support rod 23 is fixed to the side wall of the bottom end of the side bracket 17;

[0083] The one-way limiting wheel 19 is slidably connected to the outer wall of the support rod 23. A movable one-way limiting spring tooth 25 is installed on the circumferential outer wall of the one-way limiting wheel 19 through a built-in spring. One side of the one-way limiting spring tooth 25 is a flat structure, and the other side of the one-way limiting spring tooth 25 is an inclined structure;

[0084] A second spring 18, with both ends of the second spring 18 respectively fixed to the one-way limiting wheel 19 and the side bracket 17;

[0085] The inner circumferential wall of the winding wheel 16 is integrally provided with evenly distributed protruding teeth 24, which together with the one-way limiting spring teeth 25 form a one-way limiting effect;

[0086] By setting up a clamping mechanism, when clamping and fixing the lens 14, the one-way limiting wheel 19 is taken out from the inner side of the winding wheel 16 with the cooperation of the deformation of the second spring 18, and the restriction of the winding wheel 16 is released, thereby pulling the connecting rope 20 from the outer wall of the winding wheel 16 to a sufficient length, and then the one-way limiting wheel 19 is installed in the recovery reel 16, and the connecting rope 20 is arranged on the outside of the lens 14; then the two winding wheels 16 are rotated to reel the connecting rope 20 to make the connecting rope 20 taut. At this time, most of the outer side of the lens 14 is wrapped by the lens 14, and the upper part of the connecting rope 20 can be pressed against the outer wall of the lens 14 by the pressing wheel 15, forming the effect of multiple clamping rollers 13 fixing the lens 14. This method is suitable for lenses 14 of different diameters, and due to the use of multi-point support, the fixation is reliable, and the clamping roller 13 is rotatable, which avoids wear on the lens 14 during the clamping process and has strong practicality.

[0087] In order to confirm the clamping accuracy; Figure 1 、 Figure 2 As shown, the device also includes a shooting and positioning mechanism, which includes:

[0088] a first horizontal adjustment assembly, on which a first vertical adjustment assembly is mounted;

[0089] A first lifting frame 9, the first lifting frame 9 is installed on the first vertical adjustment assembly;

[0090] CCD assembly 8, CCD assembly 8 is installed on the top outer wall of the first lifting frame 9, and CCD assembly 8 is used to identify the circular contour of the lens 14;

[0091] A dot mark for identification by the CCD component 8 is provided at the center of the end face of the limiter;

[0092] By setting up structures such as the CCD component 8, the circular outline of the lens 14 and the point marks of the limiter can be identified based on the CCD component 8. The point marks distributed on the outside of the lens 14 can form an arc structure, which is identified, analyzed and judged by the CCD component 8. When the center of the arc structure formed by the point marks coincides with the center of the circular outline of the lens 14, it means that the lens 14 is clamped accurately.

[0093] To facilitate testing; Figure 2 、 Figure 6 As shown, the testing organizations include:

[0094] a second horizontal adjustment assembly, on which a second vertical adjustment assembly is mounted;

[0095] A second lifting frame 11, the second lifting frame 11 is installed on the second vertical adjustment assembly;

[0096] Bracket 32, bracket 32 ​​is fixed to the outer wall of one side of the second lifting frame 11;

[0097] Testing parts: two testing parts are symmetrically installed on the second lifting frame 11 and the bracket 32.

[0098] The testing department includes:

[0099] Translation blocks 31, two translation blocks 31 are slidably connected to the second lifting frame 11 and the inner wall of the bracket 32, respectively, and scale lines 30 are set on the translation blocks 31;

[0100] A mounting plate 27, the mounting plate 27 being fixed to the top outer wall of the translation block 31;

[0101] Fixed brackets 29, two fixed brackets 29 are respectively mounted on the top outer wall of the second lifting bracket 11 and the bracket 32;

[0102] An adjusting knob 33 is rotatably mounted on the inner wall of the fixing frame 29 and is connected to the inner wall of the mounting plate 27 via threads;

[0103] The second measuring head 28 is mounted on the mounting plate 27 .

[0104] In order to improve the reliability of positioning measurements; Figure 6 As shown, a positioning ring 2 is fixed to the outer wall of the top of the second lifting frame 11, and the first measuring head 26 coincides with the central axis of the positioning ring 2;

[0105] By setting the positioning ring 2, the position of the first measuring head 26 can be determined by using the positioning ring 2 when the CCD assembly 8 is shooting. When the center of the positioning ring 2 coincides with the center of the circular contour of the lens 14, it indicates that the first measuring head 26 has been positioned at the center of the lens 14, so that the center thickness of the lens 14 can be directly measured, avoiding the situation where the lens 14 is worn out due to multiple measurements.

[0106] In order to facilitate the adjustment of the horizontal position; Figure 2 As shown, the first level adjustment component and the second level adjustment component both include:

[0107] A translational slide rail 5, wherein a translation screw 6 is rotatably mounted on an inner wall of one side of the translational slide rail 5;

[0108] The translation seat 4 is slidably connected to the inner wall of the translation rail 5, and the translation screw 6 is connected to the inner wall of the translation seat 4 through a thread.

[0109] In order to facilitate the adjustment of the vertical position; Figure 1 、 Figure 2 As shown, the first vertical adjustment assembly and the second vertical adjustment assembly both include:

[0110] The lifting guide rod 3 is fixed to the outer wall of the top of the translation seat 4, and the second lifting frame 11 and the first lifting frame 9 are slidably connected to the outer walls of the two lifting guide rods 3 respectively;

[0111] The lifting screw 7 has its bottom end rotatably mounted on the top inner wall of the translation seat 4 , and the second lifting frame 11 and the first lifting frame 9 are respectively connected to the outer walls of the two lifting screws 7 through threads.

[0112] Example 2:

[0113] A method for measuring the center thickness of a lens comprises the following steps:

[0114] S1: Remove the one-way limiting wheel 19 from the inner side of the winding wheel 16 to release the restriction on the winding wheel 16;

[0115] S2: Pull the connecting rope 20 from the outer wall of the reel 16 to a length sufficient to fix the lens 14;

[0116] S3: Install the one-way limiting wheel 19 into the recovery reel 16;

[0117] S4: Arrange the connecting rope 20 outside the lens 14, rotate the two winding wheels 16 to wind the connecting rope 20, and make the connecting rope 20 taut outside the lens 14 with the assistance of the pressing wheel 15;

[0118] S5: Adjust the shooting positioning mechanism and use the CCD assembly 8 to identify the circular outline of the lens 14 and the dot-shaped mark to ensure that the center of the arc structure formed by the dot-shaped mark coincides with the center of the circular outline of the lens 14;

[0119] S6: Adjust the testing mechanism so that the center of the positioning ring 2 coincides with the center of the circular contour of the lens 14;

[0120] S7: Use the two first measuring heads 26 to measure the center thickness of the lens 14 .

[0121] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for measuring the center thickness of a lens, characterized in that: The invention comprises a clamping mechanism for fixing the lens and a testing mechanism for detecting the thickness of the lens, wherein the clamping mechanism comprises: a support frame, wherein a mounting frame is fixed on the support frame; A reel is rotatably mounted on the mounting frame; A connecting rope, with both ends of the connecting rope fixed to two reel wheels, and annular parts distributed at equal distances are provided on the connecting rope; The clamping roller is rotatably mounted in the annular member, and the connecting rope with the clamping roller is wound around the outer circumference of the two winding wheels; An auxiliary pressing assembly is also provided below the winding wheel to facilitate the connection rope to fit onto the lens to be tested; a one-way limiting assembly is also provided on one side of the winding wheel for fixing the winding wheel; The auxiliary pressing assembly includes: A movable frame, the top of which is slidably connected to the inner wall of one side of the mounting frame; A first spring, wherein the top end of the first spring is fixed to the mounting frame, and the bottom end of the first spring is fixed to the movable frame; The pressing wheel is rotatably mounted on the movable frame, and the thickness of the pressing wheel is smaller than the distance between the two ends of the clamping roller; The one-way limiting component includes: A side bracket is fixed to an outer wall of one side of the mounting frame; A support rod, the support rod is fixed to the side wall of the bottom end of the side bracket; A one-way limiting wheel is slidably connected to the outer wall of the support rod. A movable one-way limiting spring tooth is installed on the circumferential outer wall of the one-way limiting wheel through a built-in spring. One side of the one-way limiting spring tooth is a flat structure, and the other side of the one-way limiting spring tooth is an inclined structure. A second spring, with both ends of the second spring respectively fixed to the one-way limiting wheel and the side bracket; The inner circumferential wall of the winding wheel is provided with evenly distributed convex teeth, which form a one-way limiting effect with the one-way limiting spring teeth; A limiting body is provided at one end of the clamping roller away from the annular member, and the diameter of the limiting body is larger than the diameter of the clamping roller.

2. The device for measuring the center thickness of a lens according to claim 1, characterized in that: The device also includes a shooting and positioning mechanism, which includes: a first horizontal adjustment assembly, on which a first vertical adjustment assembly is mounted; a first lifting frame, the first lifting frame being mounted on the first vertical adjustment assembly; A CCD assembly is mounted on the top outer wall of the first lifting frame, and is used to identify the circular contour of the lens; A dot mark for identification by the CCD component is provided at the center of the end face of the limiting body.

3. The device for measuring the center thickness of a lens according to claim 2, characterized in that: The testing organization includes: a second horizontal adjustment assembly, on which a second vertical adjustment assembly is mounted; a second lifting frame, the second lifting frame being mounted on the second vertical adjustment assembly; A bracket, the bracket being fixed to an outer wall of one side of the second lifting frame; Testing parts: two testing parts are symmetrically installed on the second lifting frame and the bracket.

4. The device for measuring the center thickness of a lens according to claim 3, characterized in that: The testing unit includes: Translation blocks, the two translation blocks are slidably connected to the second lifting frame and the inner wall of the bracket respectively, and scale lines are set on the translation blocks; A mounting plate fixed to the top outer wall of the translation block; Fixed frames, two fixed frames are respectively mounted on the second lifting frame and the top outer wall of the bracket; An adjusting knob is rotatably mounted on the inner wall of the fixing frame, and the adjusting knob is connected to the inner wall of the mounting plate via a thread; The second measuring head is mounted on the mounting plate.

5. The device for measuring the center thickness of a lens according to claim 4, characterized in that: A positioning ring is fixed to the outer wall of the top of the second lifting frame, and the first measuring head coincides with the central axis of the positioning ring.

6. The device for measuring the center thickness of a lens according to claim 3, characterized in that: The first level adjustment component and the second level adjustment component both include: A translational slide rail, wherein a translation screw is rotatably mounted on the inner wall of one side of the translational slide rail; A translation seat, the translation seat is slidably connected to the inner wall of the translation rail, and the translation screw (6) is connected to the inner wall of the translation seat through a thread; The first vertical adjustment component and the second vertical adjustment component both include: A lifting guide rod is fixed to the outer wall of the top of the translation seat, and the second lifting frame and the first lifting frame are slidably connected to the outer walls of the two lifting guide rods respectively; The lifting screw has a bottom end which is rotatably mounted on the top inner wall of the translation seat, and the second lifting frame and the first lifting frame are respectively connected to the outer walls of the two lifting screws through threads.

7. A method for measuring the center thickness of a lens according to any one of claims 1 to 6, characterized in that: The steps include: S1: Remove the one-way limiting wheel from the inside of the winding wheel to release the restriction on the winding wheel; S2: Pull the connecting rope from the outer wall of the reel to a length sufficient to fix the lens; S3: Install the one-way limiting wheel into the recovery reel; S4: Arrange the connecting rope outside the lens, rotate the two winding wheels to wind the connecting rope, and make the connecting rope taut on the outside of the lens with the assistance of the pressing wheel; S5: Adjust the shooting positioning mechanism, and use the CCD component to identify the circular outline of the lens and the dot mark to ensure that the center of the arc structure formed by the dot mark coincides with the center of the circular outline of the lens; S6: Adjust the testing mechanism so that the center of the positioning ring coincides with the center of the circular contour of the lens; S7: Measure the center thickness of the lens using the two first measuring heads.

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