Optical lens eccentricity detection jig

Abstract

This utility model discloses an optical lens eccentricity detection fixture, belonging to the field of fixture technology. The fixture includes a base plate, a displacement plate, two or more clamping rods, and a guide rod. The base plate has a central through hole, and its side wall has side slots. The clamping rods move back and forth within the side slots to enter the central through hole. The base plate has a first limiting slot, and the displacement plate has a second limiting slot. When the displacement plate is rotated, it pushes the guide rods to move along the second limiting slot, and the movement of the guide rods causes the clamping rods to move. The displacement plate allows the three clamping rods to move synchronously; the thrust springs constantly move the clamping rods towards the center of the central through hole, and the three clamping rods stably fix the optical lens or carrier at its center. Clamping is easily achieved without additional tools; the operation is simple, efficient, and accurate.

Description

Technical Field

[0001] This utility model belongs to the field of fixture technology, specifically relating to an optical lens eccentricity detection fixture. Background Technology

[0002] After optical lenses are manufactured, in order to ensure image quality, it is usually necessary to test the eccentricity of two surfaces of the optical lens. Currently, optical lenses are usually fixed by a testing fixture. For example, the Chinese utility model patent disclosed in authorization announcement number CN210571305U, entitled "Eccentricity Testing Fixture for Batch Aspherical Glass Lenses", uses three clamps to fix the carrier. By moving the slider, the clamps are controlled to move towards or away from the receiving hole, thereby completing the installation and removal of the carrier. In this technical solution, the position of the three clamps is adjusted in a distributed manner. When clamping the center product, the operator needs to stabilize the central fixture with one hand and use a tool (such as a screwdriver or hex wrench) with the other hand to move the three clamps step by step. Because the three clamps move independently, their front and rear extension positions are different, and their tightness is different. The adjustment process is relatively complicated and can easily cause the center product to fall or tilt. At the same time, the work efficiency is low. Utility Model Content

[0003] The technical problem solved by this utility model is to provide an optical lens eccentricity detection fixture to improve the efficiency of lens clamping.

[0004] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An optical lens eccentricity detection fixture includes a substrate, a displacement plate on the substrate, two or more clamping rods that move within the substrate, and guide rods connected to the clamping rods. The substrate has a central through hole corresponding to the lens, and the side wall of the substrate has a side slot communicating with the side of the central through hole. The clamping rods move back and forth within the side slots to enter the central through hole. The substrate has a first limiting slot corresponding to the guide rod, and the displacement plate has a second limiting slot corresponding to the guide rod. When the displacement plate is rotated, the displacement plate pushes the guide rod to move along the second limiting slot, and the movement of the guide rod drives the clamping rod to move.

[0006] Furthermore, the clamping rod is provided in three parts.

[0007] Furthermore, the substrate is provided with a thrust assembly corresponding to the side slot hole. The thrust assembly includes a fixed rod and a thrust spring. The fixed rod is threaded to the side slot hole. The fixed rod presses the thrust spring onto one of the three clamping rods. The clamping rod moves toward the central through hole under the elastic force of the thrust spring.

[0008] Furthermore, the central through hole is a circular hole, and the extensions of the central axes of the three clamping rods intersect at the center of the central through hole.

[0009] Furthermore, the top of the clamping rod is provided with a clamping groove.

[0010] Furthermore, multiple reference balls are detachably connected to the substrate.

[0011] Furthermore, the substrate is detachably connected to a plurality of positioning pins, the positioning pins penetrating the substrate, and the sidewall of the substrate is connected to a set screw corresponding to the positioning pin.

[0012] Furthermore, a head is connected to the guide rod, and the lower end of the guide rod is threadedly connected to the clamp rod.

[0013] Furthermore, the second limiting slot is an arc-shaped hole or a strip-shaped hole.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0015] 1. The clamping rod moves back and forth in the side slot of the substrate to clamp the optical lens or lens carrier. A guide rod is connected to the clamping rod. A displacement plate is set above the substrate. The displacement plate is provided with a second limiting slot corresponding to the guide rod. The displacement plate can be used to make the back and forth movement of the three clamping rods synchronized.

[0016] 2. Set up a thrust assembly, using a thrust spring to keep the clamping rod moving towards the center of the central through hole. The displacement plate drives the other two clamping rods to move towards the center as well. The three clamping rods stably fix the optical lens or carrier at the center.

[0017] 3. The three clamping rods are synchronized in center and action. By rotating the displacement plate, clamping can be easily achieved without the need for additional tools (such as screwdrivers or hex wrenches). The action is simple, efficient, and accurate in positioning. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the substrate structure of an embodiment;

[0020] Figure 3 This is a schematic diagram of the displacement plate structure in an embodiment;

[0021] Figure 4 This is a schematic diagram of the clamping rod structure in an embodiment;

[0022] Figure 5 This is a schematic diagram of the thrust assembly structure in an embodiment;

[0023] Figure 6This is a schematic diagram of the limiting piece structure in an embodiment. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0025] like Figure 1 , Figure 2 and Figure 4 As shown, an optical lens eccentricity detection fixture includes a substrate 1, a displacement plate 2, three clamping rods 3 and three guide rods 4. The substrate 1 is a rectangular plate with a central through hole 11 at its center. The central through hole 11 extends vertically through the substrate 1 and is a circular hole. In use, the optical lens is located inside the central through hole 11 (if multiple optical lenses are placed using a lens carrier, the lens carrier is located inside the central through hole 11). Three side slots 12 are provided on the side wall of the substrate 1. The three side slots 12 extend from the side wall of the substrate 1 inward and communicate with the side of the central through hole 11. The side slots 12 are circular holes and are arranged along the radial direction of the central through hole 11. The extension lines of the axes of the three side slots 12 intersect at the center of the central through hole 11, and the three side slots 12 are arranged in a circular array. The clamping rod 3 is cylindrical in shape. The three clamping rods 3 are located in the corresponding side slots 12. The clamping rods 3 move in the substrate 1 through the side slots 12. The clamping rods 3 move back and forth in the side slots 12 to enter the central through hole 11. The top of the clamping rod 3 is provided with a clamping groove 31. The clamping groove 31 is V-shaped, so as to accommodate optical lenses of different thicknesses. The extension lines of the central axes of the three clamping rods 3 intersect at the center of the central through hole 11. When the three clamping rods 3 move together toward the center of the central through hole 11, they can clamp the optical lens or the lens carrier.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the tail end of the clamping rod 3 is provided with a threaded hole, and the lower end of the guide rod 4 is threadedly connected to the clamping rod 3. The upper surface of the substrate 1 is provided with a first limiting slot 13 corresponding to the position in the side slot 12. The first limiting slot 13 is also provided in the radial direction along the central through hole 11. The first limiting slot 13 is connected to the side slot 12. The guide rod 4 passes through the first limiting slot 13 upward. When the guide rod 4 moves back and forth in the first limiting slot 13, it drives the clamping rod 3 to move back and forth in the side slot 12. The displacement plate 2 is disposed above the substrate 1. The displacement plate 2 is circular. The displacement plate 2 has a second central hole 22 in the middle, which corresponds to the central through hole 11. The diameter of the second central hole 22 is larger than the diameter of the central through hole 11. The displacement plate 2 has three second limiting slots 21. The three second limiting slots 21 are arranged in a circular array and gradually extend from the inner ring to the outer ring of the displacement plate 2. The second limiting slots 21 are arc-shaped holes (or long strip holes). The position of the second limiting slots 21 corresponds to the guide rod 4. The guide rod 4 passes through the second limiting slots 21 and penetrates the displacement plate 2 upward. When the displacement plate 2 is rotated, the inner side of the second limiting slots 21 of the displacement plate 2 pushes the guide rod 4 to move along the second limiting slots 21. At the same time, since the guide rod 4 is constrained by the first limiting slot 13, the guide rod 4 moves back and forth in the first limiting slot 13. When the guide rod 4 moves back and forth, it drives the corresponding clamping rod 3 to move back and forth. Thus, by rotating the displacement plate 2, the three clamping rods 3 can be driven to move back and forth synchronously. The top of the guide rod 4 is connected to a head 41, which is a round plate, so that the guide rod 4 can be rotated by hand. The diameter of the head 41 is larger than the width of the second limiting slot 21. After the fixture is flipped, the head 41 can fix the displacement plate and prevent the displacement plate 2 from falling off.

[0027] like Figure 1 and Figure 5 As shown, a thrust assembly 5 is provided on the substrate 1. The thrust assembly 5 includes a fixing rod 51 and a thrust spring 52. Three clamping rods 3 are arranged in a circular array. The position of one of the three clamping rods 3 corresponds to a corner position of the substrate 1. The position of the thrust assembly 5 corresponds to the side slot hole 12 at that location (the clamping rod 3 position at the corner of the substrate 1). The thrust spring 52 is located in the side slot hole 12. The fixing rod 51 is located at the rear end of the thrust spring 52. The inner wall of the rear end of the side slot hole 12 is provided with an internal thread, and the fixing rod 51 is provided with a corresponding external thread. The fixing rod 51 and the side slot hole The 12-threaded connection and the fixing rod 51 limit the position of the thrust spring 52. The fixing rod 51 presses the thrust spring 52 onto the rear end of the clamping rod 3 in the side slot 12. Under the elastic force of the thrust spring 52, the clamping rod 3 moves toward the central through hole 11. Because of the thrust spring 52, the corresponding clamping rod 3 always maintains the force to move toward the central through hole 11. Due to the limiting effect of the displacement plate 2, the other two clamping rods 3 also always maintain the force to move toward the central through hole 11 under the push of the displacement plate 2. Thus, the three clamping rods 3 can be used to clamp optical lenses.

[0028] like Figure 1 , Figure 2 and Figure 6 As shown, three reference spheres 6 are detachably connected to the substrate 1. These three reference spheres 6 are arranged in a circular array. The reference spheres 6 are spheres and are crucial components for lens eccentricity detection. The principle and process of lens eccentricity detection are as follows: Assuming the upper and lower surfaces of the substrate 1 are surface A and surface B respectively, the first step is to detect the fixed points on the surfaces of the three reference spheres on surface A (because three points determine a plane, the plane determined by the vertices of the three reference spheres is used as the reference plane in the software). The second step is to detect the fixed points of the lens. The third step is to flip the fixture and detect the vertices of the three reference spheres on surface B (surfaces A and B share three reference spheres), fitting the reference plane of surface B in the software. The fourth step is to detect the vertices of the lens on surface B. The fifth step is for the software to fit the reference planes of surfaces A and B into a single reference plane, then calculate the deflection angle of the line connecting the vertices of the lenses on surfaces A and B relative to the normal of the reference plane; this is the lens eccentricity angle. Simultaneously, the distance of the lens vertex from the normal can also be measured. The substrate 1 has a fourth through hole 14 corresponding to the reference ball 6. The fourth through hole 14 is a countersunk hole, and the diameter of the lower end of the fourth through hole 14 is smaller than the diameter of the reference ball 6. The substrate 1 has a limiting groove 15 corresponding to the fourth through hole 14. A limiting piece 61 is provided in the limiting groove 15. The limiting piece 61 is detachably connected to the substrate 1 by an internal hex bolt 62. The limiting piece 61 has a limiting hole 611 corresponding to the reference ball 6. The limiting hole 611 is also a countersunk hole, and the diameter of the lower end of the limiting hole 611 is smaller than the diameter of the reference ball 6. Thus, the reference ball 6 is limited between the substrate 1 and the limiting piece 61 by the limiting piece 61.

[0029] like Figure 1 and Figure 2 As shown, three positioning pins 7 are detachably connected to the substrate 1. The substrate 1 has three pin holes 16, all located outside the area of ​​the displacement plate 2. The pin holes 16 penetrate the substrate 1, and the positioning pins 7 are located within the pin holes 16 and penetrate the substrate 1. A set screw 71 corresponding to the positioning pin 7 is threaded onto the side wall of the substrate 1. The position of the positioning pin 7 is fixed by the top of the set screw 71 pressing against the side wall of the positioning pin 7. The upper end of the positioning pin 7 exceeds the highest point of the head 41, and the lower end of the positioning pin 7 exceeds the lowest point of the substrate 1. Regardless of which side of the substrate 1 faces upwards, the three positioning pins 7 can support the entire fixture. During testing, the fixture needs to be placed on the platform of the equipment. The positioning pins 7 are the support points when the fixture is placed; three points determine a plane. The three positioning pins 7 are adjustable up and down, ensuring the fixture remains horizontal when placed, and the lens being tested in the middle is also in a relatively horizontal state. During testing, the instrument's probe scribing vertically across the lens surface from top to bottom will detect any issues. If the lens is not in a relatively horizontal state, it will affect the test results.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fixture for detecting optical lens eccentricity, characterized in that, The system includes a substrate (1), a displacement plate (2) on the substrate (1), two or more clamping rods (3) that move within the substrate (1), and a guide rod (4) connected to the clamping rods (3). The substrate (1) has a central through hole (11) corresponding to the lens. The side wall of the substrate (1) has a side slot (12) that communicates with the side of the central through hole (11). The clamping rod (3) moves back and forth within the side slot (12) to enter the central through hole (11). The substrate (1) has a first limiting slot (13) corresponding to the guide rod (4). The displacement plate (2) has a second limiting slot (21) corresponding to the guide rod (4). When the displacement plate (2) is rotated, the displacement plate (2) pushes the guide rod (4) to move along the second limiting slot (21). When the guide rod (4) moves, it drives the clamping rod (3) to move.

2. The optical lens eccentricity detection fixture according to claim 1, characterized in that, The clamp (3) is provided in three parts.

3. The optical lens eccentricity detection fixture according to claim 2, characterized in that, The substrate (1) is provided with a thrust assembly (5) corresponding to the side slot (12). The thrust assembly (5) includes a fixing rod (51) and a thrust spring (52). The fixing rod (51) is threadedly connected to the side slot (12). The fixing rod (51) presses the thrust spring (52) onto one of the three clamping rods (3). The clamping rod (3) moves toward the central through hole (11) under the elastic force of the thrust spring (52).

4. The optical lens eccentricity detection fixture according to claim 2, characterized in that, The central through hole (11) is a circular hole, and the extension lines of the central axes of the three clamping rods (3) intersect at the center of the central through hole (11).

5. The optical lens eccentricity detection fixture according to claim 1, characterized in that, The clamping rod (3) has a clamping groove (31) at its top end.

6. The optical lens eccentricity detection fixture according to claim 1, characterized in that, Multiple reference balls (6) are detachably connected to the substrate (1).

7. The optical lens eccentricity detection fixture according to claim 1, characterized in that, A plurality of positioning pins (7) are detachably connected to the substrate (1), the positioning pins (7) penetrate the substrate (1), and the side wall of the substrate (1) is connected to a set screw (71) corresponding to the positioning pin (7).

8. The optical lens eccentricity detection fixture according to claim 1, characterized in that, The guide rod (4) is connected to a head (41), and the lower end of the guide rod (4) is threadedly connected to the clamp rod (3).

9. The optical lens eccentricity detection fixture according to claim 1, characterized in that, The second limiting slot (21) is an arc-shaped hole or a strip-shaped hole.

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