Positioning clamp for lens MTF detection and use method thereof

Abstract

The invention discloses a positioning clamp for lens MTF detection and a use method thereof. The whole positioning clamp is composed of MTF equipment end positioning holes, lens end positioning concave claws, horizontal adjusting pins, circular fulcrums, springs, spring positioning pins, a lens end upper plate and an equipment end lower plate. When a lens MTF is measured, a positioning hole in the equipment end lower plate is connected with a circular hole of MTF test equipment, a positioning concave claw of the lens end upper plate is connected with a lens, and the horizontal degree of the lens end upper plate is controlled by adjusting the two horizontal adjusting pins, so that the optical axis of the lens coincides with the optical axis of the MTF test equipment. The positioning clamp has the advantages that through the operation, the MTF test equipment end positioning hole and the lens end positioning concave claw can quickly ensure that the optical axis of the tested lens coincides with the optical axis of MTF test equipment with high precision, the designed positioning fixture is simple in structure and low in cost, and the test precision and the test efficiency of the lens MTF test are greatly improved.

Description

technical field [0001] The invention belongs to the field of camera lens detection, and relates to a clamp device for lens MTF detection and a use method thereof. Background technique [0002] The MTF of the lens comprehensively reflects the contrast and resolution characteristics of the lens. It can evaluate the ability of the lens to restore the details of the scene, and can also comprehensively and objectively characterize the sharpness of the scene. Moreover, the lens MTF can be measured by professional instruments to exclude objective factors such as film. The impact and the influence of subjective factors of manual interpretation are currently a relatively scientific method for analyzing the resolution capability of a lens. Existing test equipment is when testing the MTF parameters of the lens. At present, in the lens MTF test, it is necessary to manually adjust the optical axis of the tested lens to coincide with the optical axis of the MTF test equipment manually ev...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of low axis alignment efficiency and low measurement accuracy in lens MTF detection in the above-mentioned technical background, the present invention proposes a positioning fixture for lens MTF detection and its use method, and a positioning concave claw with an included angle of 120° is designed to be fixed. At the same time, the sample holder positioning fixture of the MTF test equipment is designed, which is used to fix the optical axis of the lens under test and the MTF test equipment on the same straight line, and adjust the lens through a circular fulcrum and two horizontal adjustment pins for precise control The level of the lens end face finally realizes the high-precision, fast and convenient test of the lens MTF

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