Tool for measuring decentration of lens

Abstract

The utility model provides a tool for measuring the center deviation of a lens, which comprises a base and a measuring platform, the measuring platform is provided with two bearings, the base and the measuring platform are connected into a whole, and a through air hole is arranged in the middle of the base and the measuring platform. The utility model has the advantages of simple structure and low cost, and effectively solves the problem of inaccurate measurement caused by easy movement in the process of measuring the decentration of the lens.

Description

Technical Field

[0001] This utility model belongs to the field of optical processing technology, specifically relating to a tooling for measuring the center deviation of a lens. Background Technology

[0002] In optical cold processing, lens center offset is a crucial indicator, directly impacting the imaging quality of the optical system. Therefore, strict control of the center offset of each lens in the optical system is essential; in other words, lens center offset testing is a mandatory step in the optical cold processing process. Currently, center offset is measured by rotating the lens 360 degrees. However, since it's difficult to ensure the lens doesn't move during rotation, the measurement results are often inaccurate and inconsistent. Utility Model Content

[0003] The purpose of this invention is to provide a tooling for measuring the center deviation of a lens, in order to solve the problem of the lens being easily moved during rotation.

[0004] The technical solution of this utility model is implemented as follows: A fixture for measuring the center deviation of a lens includes a base and a measuring platform. The measuring platform is equipped with two bearings, and the base is integrated with the measuring platform, with a through-hole in the middle. The bearings greatly reduce rotational resistance during lens measurement; the through-hole connects to a negative pressure tube, allowing the lens to be slightly adhered to the measuring platform.

[0005] Preferably, the base is cylindrical and has a sealing ring on its outer side. The sealing ring ensures that the base is stably fixed in the slot.

[0006] Preferably, the two bearings are connected to the measuring platform via a fixed shaft, the centers of the two bearings are equidistant from the center of the air hole, and the angle formed by the lines connecting the centers of the two bearings and the center of the air hole is 120°. This arrangement allows the lens to rotate.

[0007] Preferably, the base and measuring platform are made of nylon. Nylon has a low coefficient of friction, allowing the lens to rotate smoothly on the measuring platform.

[0008] This invention has a simple structure and low cost, and effectively solves the problem of inaccurate measurement caused by easy movement of the lens center during measurement. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0010] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0011] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 ;

[0012] Figure 4 This is a top-view schematic diagram of the measurement platform;

[0013] In the diagram: 1-base, 2-measuring platform, 3-fixed shaft, 4-bearing, 5-air hole, 6-sealing ring. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0015] like Figures 1 to 4 The fixture shown for measuring the center deviation of a lens includes a base 1 and a measuring platform 2. The measuring platform 2 is equipped with two bearings 4. The base 1 and the measuring platform 2 are integrated and have a through air hole 5 in the middle. The base 1 is cylindrical and has a sealing ring 6 on the outside. The two bearings 4 are connected to the measuring platform 2 through a fixed shaft 3. The fixed shaft 3 is inserted into two blind holes in the measuring platform 2. The center of the two bearings 4 is equidistant from the center of the air hole 5, and the included angle A formed by the lines connecting the center of the two bearings 4 and the center of the air hole 5 is 120°. Both the base 1 and the measuring platform 2 are made of nylon.

[0016] Working principle and process: During measurement, the base 1 is fixed in the slot, and the air hole 5 at the bottom is connected to the negative pressure tube, which is connected to the negative pressure pump. The lens to be measured is placed on the measuring platform 2, above the air hole 5, with its two sides abutting against the two bearings 4. The rotating roller contacts the other side of the lens and drives the lens to rotate. The three contact points of the lens, the two bearings 4, and the roller form an equilateral triangle, so the lens will not move when it rotates. The negative pressure formed by the air hole 5 makes the lens slightly adhere to the measuring platform 2. Since the measuring platform 2 is made of nylon material, its coefficient of friction is small, and the frictional resistance when the lens rotates is very small, so that the lens rotates stably and ensures the consistency of the measurement data.

[0017] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fixture for measuring the center deviation of a lens, characterized in that, It includes a base (1) and a measuring platform (2). The measuring platform (2) is equipped with two bearings (4). The base (1) and the measuring platform (2) are connected as one unit, and a through air hole (5) is provided in the middle.

2. The tooling according to claim 1, characterized in that, The base (1) is cylindrical and has a sealing ring (6) on the outside.

3. The tooling according to claim 1 or 2, characterized in that, The two bearings (4) are connected to the measuring platform (2) via a fixed shaft (3). The center of the two bearings (4) is equidistant from the center of the air hole (5), and the angle (A) formed by the line connecting the center of the two bearings (4) and the center of the air hole (5) is 120°.

4. The tooling according to claim 3, characterized in that, The base (1) and measuring platform (2) are made of nylon.

Images