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Analysis method for free surface tolerance

An analysis method and tolerance technology, applied in the field of free-form surface tolerance analysis, can solve the problems of free-form surface machining accuracy and test verification that cannot be verified

Active Publication Date: 2019-01-15
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

[0003] Up to now, there are still some engineering problems in the processing and assembly of optical systems including free-form surfaces: During the design process of optical systems, the surface shape of free-form surfaces and their surface tolerances are expressed in the form of coefficients describing the formula
This expression is more friendly and intuitive to designers, but for free-form surface processing personnel, the surface processing accuracy is usually expressed by PV value, which has nothing to do with the formula form of the surface design process
If the tolerance description method of the free-form surface is not converted into a PV value, the machining accuracy and test verification of the free-form surface will not be verified.

Method used

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  • Analysis method for free surface tolerance
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  • Analysis method for free surface tolerance

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Embodiment Construction

[0021] The analysis method described in this paper involves three types of data, including: the formula coefficient of the free-form surface, the formula coefficient of the surface tolerance of the free-form surface, and the PV value of the surface tolerance of the free-form surface.

[0022] The purpose of the analysis method described in this paper is to convert the formula and coefficient value of free-form surface tolerance commonly used by designers into the PV value of free-form surface tolerance commonly used by processors, so as to facilitate actual processing and verification.

[0023] The analysis method of the free-form surface tolerance of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. see figure 1 :

[0024] First, optical designers describe and optimize free-form surfaces (S1) according to specific surface formulas according to their design habits and experience. Taking the Zernike...

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Abstract

The invention relates to an analysis method for free surface tolerance, which is used for guiding the free surface machining. The analysis method is characterized in that the tolerance of the formulacoefficients of the formula is converted to the PV value tolerance by a statistical method for the free surface described by a specific formula. Compared with a traditional analysis method for free surface tolerance, the analysis method for free surface tolerance has the following advantages: (1) clarifying the conversion method of the tolerance requirement of the design process to the tolerance requirement of the machining process; (2) is more suitable for guiding the free surface machining.

Description

technical field [0001] The invention relates to a method for analyzing tolerances of free-form surfaces. Background technique [0002] The free-form surface is an innovative surface in the design of visual optical systems in recent years. Compared with the traditional spherical, aspheric, tire surface and other surface types, the free-form surface has the characteristics of less surface constraints and more variables that can be optimized. A free-form surface can often replace multiple traditional surface types, which simplifies and compacts the optical system. [0003] Up to now, there are still some engineering problems in the processing and assembly of optical systems including free-form surfaces: during the design process of optical systems, the surface shape of free-form surfaces and their surface tolerances are expressed in the form of coefficients describing the formula. This expression is more friendly and intuitive to designers, but for free-form surface processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 高阳张海军刘龙飞姬强周亮李卓龙尤
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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