Three-point-linked variable spherical curvature measuring instrument and method therefor

Abstract

A triple coordinated type reducing sphere curvature measuring apparatus and measuring methods which are used to measure the curvature radius and arc profile tolerance of sphere elements are disclosed. The triple coordinated type reducing sphere curvature measuring apparatus includes grating ruler, stepping motor, SCM, display, ball feed screw, slide bar, guide bar, slider, brace, workbench and base. The measuring methods are that the first bilge is detected at some initial position of ring radius, then the ring radius is changed to another position, the second bilge is detected; at last the surface curvature radius of sphere elements to be detected and current measurement accuracy can be calculated by SCM based on the measure equation. Further, it is characterized in that measurement result can be instantaneous displayed, measurement can be continuous, measurement accuracy is high, it don't need flat crystal cyclical test.

Description

Technical field [0001] The invention relates to an optical precision measuring instrument, in particular to a three-point linkage variable-diameter spherical curvature measuring instrument and a measuring method for the radius of curvature of the surface of a spherical element. technical background [0002] In the processing and manufacturing process of optical production, it is necessary to measure the radius of curvature of a lens with a spherical element shape. Therefore, the measurement of the radius of curvature of a spherical element is one of the important subjects in the testing field. In the measurement method using mechanical contact, a template, a simple ball diameter micrometer or a toroidal ball diameter meter is generally used. For spherical elements with different radii of curvature, a matching template is usually required, and it can only be used in a fixed manner and cannot be continuously measured. The ring spherometer can only perform simple measurement. Its me...

AI Technical Summary

Problems solved by technology

At present, the method to solve this contradiction is to prepare multiple sets of measuring rings with different radii, and use measuring rings with different radii for different curvature radii of the spherical element to be measured and different measurement accuracy. Since the curvature radius of the spherical element to be measured must be roughly estimated first, Then make a judgment, choose the appropriate measuring ring, and then conduct a detailed measurement, and when measuring the curvature radius of different spherical components to be tested, you must choose measuring rings with different radii, so that when facing spherical components of different sizes, you cannot Avoid frequent loading and unloading and replacement of measuring rings with different radii, and also introduce a lot of random errors and human errors, which greatly reduces the measurement accuracy

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