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Test method and test device for curvature of long-focal-length lens

The technology of a telephoto lens and a testing method, which is applied in the field of optical measurement, can solve the problems of improving testing requirements and costs, and achieve the effects of saving testing space, improving accuracy, and reducing length requirements.

Active Publication Date: 2019-10-25
UNION OPTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional methods greatly increase testing requirements and costs

Method used

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  • Test method and test device for curvature of long-focal-length lens
  • Test method and test device for curvature of long-focal-length lens
  • Test method and test device for curvature of long-focal-length lens

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Experimental program
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Embodiment 1

[0036] Such as Figure 1 to Figure 4 Shown, a kind of testing method and testing device of telephoto lens curvature, test the concave surface curvature of telephoto lens, described method utilizes telephoto lens curvature testing device, and described device comprises laser interferometer 1, standard spherical sample 2, reflection mirror 6, standard reflector 4, grating ruler 7, reflector base 5, stage 3, gem bead 8. The reflector 6 is installed on the grating scale 7 and is movable on the grating scale 7, and the standard reflector base 5 is fixed and immovable. Wherein, the standard reflector 4 is a 45-degree standard reflector. There are three jewel balls 8, which are evenly distributed on the stage 3 in a circle, and the size of the circle is slightly smaller than the diameter of the standard spherical model 2 or the lens to be tested.

[0037] In order to meet the requirements of different measuring calibers, the object stage 3 can be an object stage 3 with different ci...

Embodiment 2

[0057] The present embodiment provides a kind of testing method and testing device of telephoto lens curvature, tests the concave surface curvature of telephoto lens, and described method utilizes telephoto lens curvature testing device, and described device comprises laser interferometer 1, standard spherical model 2, Reflector 6, standard reflector 4, grating ruler 7, reflector base 5, stage 3, gem ball 8. Wherein, the standard reflector 4 is a 45-degree standard reflector. There are three jewel balls 8, which are evenly distributed on the stage 3 in a circle, and the size of the circle is slightly smaller than the diameter of the standard spherical model 2 or the lens to be tested. The parallel light emitted by the laser interferometer 1 is parallel to the testing direction of the grating ruler 7 . The size of the reflector 6 is smaller than the aperture of the standard spherical sample 2 or the lens to be tested.

[0058] Different from Embodiment 1, in this embodiment, ...

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PUM

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Abstract

The invention discloses a test method and test device for the curvature of a long-focal-length lens. According to the method, a difference between reflection focal lengths of a to-be-tested lens and astandard spherical sample panel is measured to measure the curvature of an actual to-be-tested lens. In addition, the invention also discloses a test device for the curvature of a long-focal-length lens. The device comprises a laser interferometer, a standard spherical sample plate, a reflecting mirror, a standard reflecting mirror, a grating ruler, a reflecting mirror base and an objective table. The curvature is measured by measuring the reflection focal length, so that the requirement on the length of the grating ruler is reduced; the precision can be improved substantially within the short distance; and the test space is saved substantially.

Description

technical field [0001] The invention belongs to the field of optical measurement, in particular to a test method and a test device for the curvature of a telephoto lens. Background technique [0002] At present, the interference method is used to measure the curvature of the lens to find the surface image and the center image of the curvature, and the curvature of the lens is measured by measuring the distance between the two images. This method requires a high-precision grating ruler to measure. For Generally, there is no problem in the test with a small curvature, but for products with a large curvature, the length of the grating scale is very long. The size of the shock table also has higher requirements. Traditional methods greatly increase detection requirements and costs. Contents of the invention [0003] The object of the present invention is to solve the problems existing in the prior art, to provide a test method and test device for the curvature of the telepho...

Claims

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Application Information

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IPC IPC(8): G01B11/24G01B11/255
CPCG01B11/2441G01B11/255
Inventor 贺鹏肖志全
Owner UNION OPTIC