Method for designing focal length instrument of electrodeless zoom lens

Abstract

The invention provides a method for designing a focal length instrument of an electrodeless zoom lens. The method comprises the following steps of designing a free-form surface reflector structure byadopting an optical system design method, using a Zernike polynomial for representing the surface shape of the free-form surface, using ZEMAX software for fitting a polynomial coefficient corresponding to the focal length of a certain measured lens, and acquiring a surface shape structure meeting the aberration requirement, then sampling and fitting a series of Zernike polynomial coefficients corresponding to the focal length ranges from -1000 mm to -2 mm and from 2 mm to 1000 mm, and finally, establishing a micro matrix free-form surface reflector by using the obtained Zernike polynomial, controlling an electric transmission device by using a computer to realize surface shape scanning of the free-form surface reflector, and outputting a focal length value of the measured lens by using thecomputer when a clear image with the maximum image height is displayed on the CCD. The continuous zoom measurement range is improved to -1000 mm to -2 mm and 2 mm to 1000 mm; one free-form surface reflector is adopted to replace a plurality of zoom lenses, so that the assembly difficulty can be reduced, and stepless zoom can be realized.

Description

technical field [0001] The invention belongs to the technical field of focal length meter design, and in particular relates to a focal length meter design method of an infinite zoom lens. Background technique [0002] As an optical measuring instrument, the magnification method focal length meter is composed of a light source, a Borot plate, a collimator, a measured lens, a measuring lens, and a CCD target surface, such as figure 2 shown. Except for the measuring lens, which can change its position in a small range, other optical components are fixed. [0003] The working principle of the focal length meter is that the Polo plate is placed on the focal plane of the object space of the collimator, and a beam of parallel light is obtained after passing through the collimator, which is first imaged by the measured lens, and then secondly imaged by the measuring lens on the CCD. superior. [0004] In 2018, Miao Weijie and others proposed a five-speed zoom lens design without ...

AI Technical Summary

Problems solved by technology

[0005] The defects in the existing technology are: 1. The focal length between -5mm and 5mm cannot be measured; 2. Due to the large number of lenses involved in the zoom lens, the assembly difficulty is relatively large; 3. The five-speed zoom lens cannot realize infinite zoom

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