Analysis Method of Tolerance Distribution of Freeform Surface in Optical System

A technology of optical system and analysis method, which is applied in the direction of optics, optical components, reflective surface testing, etc., can solve the problem of increasing the processing cost of the processing process, the high tolerance requirements of the free-form surface area, and the inability to consider the difference in the tolerance requirements of the free-form surface Sexuality and other issues, to achieve the effect of reducing processing costs and reducing processing procedures

Active Publication Date: 2020-08-11
TSINGHUA UNIV +1
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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

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  • Analysis Method of Tolerance Distribution of Freeform Surface in Optical System
  • Analysis Method of Tolerance Distribution of Freeform Surface in Optical System
  • Analysis Method of Tolerance Distribution of Freeform Surface in Optical System

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[0025] The method for analyzing the tolerance distribution of the free-form surface of the optical system provided by the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Generally speaking, different local areas of a free-form surface have different properties, and it is a surface with "locality". It has different local curvatures, and the difference in local curvature is very significant, which reflects the locality of the surface characteristics of the free-form surface; second, due to the difference in local curvature, different regions of the free-form surface will show different convergence of the incident beam This reflects the locality of the focal power of the free-form surface; third, the processing method of the free-form surface will result in different surface processing accuracy in different regions of the surface, and different surface errors remain, that is, the surface error of th...

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Abstract

The invention relates to a method for analyzing the tolerance distribution of a free-form surface of an optical system, comprising the following steps: establishing a free-form surface imaging optical system; The maximum tolerance and minimum tolerance of field wave aberration, and select any free-form surface in the free-form surface imaging optical system; establish an isolated point jump-off model, under each field of view, the isolated point that jumps off Sequentially applied at different positions of the selected free-form surface; according to the maximum tolerance and minimum tolerance of the set wave aberration, the local surface error extremum corresponding to each field of view is inversely solved; for the selected multiple The local surface tolerance distribution of the free-form surface in the field of view is integrated to obtain the surface tolerance distribution of the free-form 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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012G01M11/005
Inventor 朱钧吴晓飞邓玉婷金国藩范守善
Owner TSINGHUA UNIV
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