Parallel grinding and cutting method for non-axial-symmetry and non-ball-surface optical element

Abstract

A parallel grinding machining method of non-axisymmetrical aspherical optical element relates to a non-axisymmetrical aspherical optical element, providing a parallel grinding machining method of non-axisymmetrical aspherical optical element applying two interlinking axles of three axles of arc grinding wheel which is made of common diamond. The procedures are that: the processing mode is chosen, the processing parameter is set and the surface point locus G of workpiece is calculated with the non-axisymmetrical aspherical surface equation; with the parameter of arc grinding wheel, the central point locus O of grinding wheel is calculated when three axles of the grinder are coupled; the average value z0' of coordinate value is figured out from the lines of z coordinate value of O, and O is replaced with O'; nonlinear equations are established, with xg and zg as primary value and the Guass-Newton iterative algorithm, and the surface point coordinate xg' and zg' of workpiece are reversely worked out with x0 and z0'; then the xg' and zg' values are substituted in the non-axisymmetrical aspherical surface equation, thereby working out the surface point locus G' of workpiece; with the parameter of the arc grinding wheel, the central point locus O1 of grinding wheel is calculated when two axles of three axles of grinder are coupled.

Description

technical field [0001] The invention relates to a non-axisymmetric aspheric optical element, in particular to a parallel grinding method for the non-axisymmetric aspheric optical element. Background technique [0002] The scanning objective lens used in laser printing and laser marking machine (Laser Marking) must meet the requirements of constant-speed scanning plane perfect imaging, but due to traditional optical imaging, the image height H is nonlinear with the scanning angle θ The relationship (H=F*tgθ) cannot satisfy the linear imaging relationship, so the surface shape of the objective lens must be deliberately designed as a free-form surface with "negative distortion" according to the requirements of linear imaging (H=F*θ). This special deformed objective lens is called a free-form surface lens in the form of an Fθ lens. [0003] Non-axisymmetric aspheric optical element (F-theta mirror) is an important type of free-form optical element and an indispensable and impor...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a 3-axis two-linkage machine using ordinary diamond arc grinding wheels for the shortcomings of the lack of flexibility of the 3-axis processing method for forming non-axisymmetric aspheric surfaces and the high requirements for tools and machinery in the spherical grinding wheel processing method. Parallel Grinding Method for Non-axisymmetric Aspheric Optical Components

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