Analysis method for surface form tolerance distribution of free-form curved surface for optical system

Abstract

The invention relates to an analysis method for the surface form tolerance distribution of a free-form curved surface for an optical system. The method comprises the following steps: building a free-form curved surface imaging optical system; selecting a plurality of view fields in the free-form curved surface imaging optical system, setting the maximum tolerance and minimum tolerance of the waveaberration of each view field, and selecting any one free-form curved surface in the free-form curved surface imaging optical system; building an isolated point jump model, and sequentially applying the jumping isolated points to different positions of the selected free-form curved surface in each field; performing the inverse solving of a partial surface form error extreme value corresponding toeach view field according to the set maximum tolerance and minimum tolerance of the wave aberration; performing the integration of the partial surface form tolerance distribution of the selected free-form curved surfaces of a plurality of view fields, and obtaining the surface form tolerance distribution of the free-form curved surface.

Description

technical field [0001] The invention relates to an analysis method for the tolerance distribution of the freeform surface of an optical system. Background technique [0002] Freeform surface is a new type of optical surface without rotational symmetry, which has a higher degree of design freedom. In recent years, with the continuous improvement of processing and testing technology, free-form surfaces have been widely used in various optical systems, such as helmet-mounted displays, off-axis reflection systems, microlens arrays, and panoramic annular lenses. [0003] Tolerance analysis is a necessary link in the whole process of optical design, which can provide effective guidance for the processing and assembly of the optical system, and ensure that the physical system after manufacturing meets the design requirements. Compared with spherical and aspheric surfaces, free-form surfaces have more complex surface features, and their processing methods will also bring more compl...

AI Technical Summary

Problems solved by technology

[0005] However, the existing surface tolerance analysis methods for free-form surfaces can only propose a global surface tolerance requirement, and cannot take into account the differences in the surface tolerance requirements of different regions of the free-form surface, which will cause the surface shape of some free-form surface regions Higher tolerance requirements increase unnecessary processing steps and processing costs

Images