Design method of free-form surface imaging system

Abstract

A design method of freeform imaging system is provided. An initial freeform imaging system is provided, the initial freeform image system comprising a first initial surface and a second initial surface spaced from each other. A second surface is constructed by calculating a plurality of second data points of the second surface through a plurality of feature rays based on the given object-image relationship. A first surface is constructed by calculating a plurality of first data points of the first surface based on the given object-image relationship and Fermat's principle, wherein the second surface is fixed. The first surface and the second surface substitute for the first initial surface and second initial surface respectively, and repeating steps list above, wherein the plurality of feature rays are intersecting the image plane at the plurality of ideal image points.

Description

technical field [0001] The invention relates to the field of optical design, in particular to a design method of a free-form surface imaging system based on point-by-point solution and iteration of a curved surface. Background technique [0002] Free-form surfaces refer to non-traditional surfaces that cannot be represented by spherical or aspherical coefficients. They are usually non-rotational symmetric, flexible in structure, and have many variables, which provide more degrees of freedom for optical design and can greatly reduce the aberration of the optical system. , to reduce the volume, weight and number of lenses of the system. In recent decades, freeform surfaces have been successfully used in non-imaging fields, especially in lighting. For the field of modern imaging, the field of view and aperture of the optical system are larger, which puts forward higher requirements for image quality, volume, and weight. At the same time, the system structure is more complicate...

AI Technical Summary

Problems solved by technology

For free-form surfaces with many variables, the optimization process can be slow and can easily get stuck in a local optimum; in addition, since different systems have different aberration characteristics due to their different structures and system parameters, this design method has a strong experience sex

[0004] However, the existing freeform surface design methods require different design strategies for different systems, and some methods have limited application range

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