Method for measuring rough machining curvature radius of sapphire concave and convex lenses

Abstract

The invention relates to a method for measuring rough machining curvature radius of sapphire concave and convex lenses, comprising the following steps: the measuring rod of a micrometer gauge penetrates through the upper-half hole of a detection bracket; a measuring head of the micrometer gauge extends out of the detection bracket to form a dedicated measuring device of the rough machining curvature radius of the sapphire lens; the dedicated measuring device is placed on an inspection panel and is adjusted to zero; the dedicated measuring device is used for detecting the curvature radius of the sapphire concave lens or the sapphire concave lens; and whether the curvature radius of the detected sapphire lens is qualified or not according to the numerical value of Hmax and Hmin. The method of the invention can ensure that the curvature radius of the lens can be accurately measured in the rough machining process of the sapphire lens, has the advantages of simple and rapid operation, and is extremely suitable for batch detection in production fields, wherein the diameter is more than or equal to 10.00mm, and the tolerance is + / -0.10mm.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method for the rough machining curvature radius of large-diameter sapphire concave and convex lenses. Background technique [0002] During the rough processing of sapphire lenses, we often encounter the problem of rapid batch measurement of the radius of curvature of large-diameter lenses (lens diameter ≥ 10.00mm, tolerance ± 0.10mm). [0003] The radius of curvature of the sapphire lens can be tested with a spherometer, a 50x horizontal projector or a universal tool microscope. Since the surface of the sapphire lens is relatively rough during rough machining (Rz0.8~Rz3.2), and the sapphire lens has a large diameter (lens diameter ≥ 10.00mm, tolerance ± 0.10mm), the above method has the following disadvantages: For spherometer testing, direct contact between the surface of the sapphire lens and the spherometer may easily damage the ruby ​​measuring head of the spherometer (the r...

AI Technical Summary

Problems solved by technology

Since the surface of the sapphire lens is relatively rough during rough machining (Rz0.8~Rz3.2), and the sapphire lens has a large diameter (lens diameter ≥ 10.00mm, tolerance ± 0.10mm), the above method has the following disadvantages: For spherometer testing, direct contact between the surface of the sapphire lens and the spherometer may easily damage the ruby ​​measuring head of the spherometer (the ruby ​​measuring head is relatively expensive), and it is not suitable for batch testing on the production site; a 50-fold horizontal projector is used for testing, due to The maximum measurement range of the 50x horizontal projector is 7.00mm, and the sapphire lens with a diameter ≥ 7.00mm cannot be fully projected. In addition, since the sapphire lens diameter is ≥ 10.00mm, the projection image of the 50x horizontal projector (especially the concave lens) cannot Clear, large measurement error; using a universal tool microscope for detection, because the lines of the sapphire convex lens surface observed through the universal tool microscope are not clear (concave lenses cannot be detected), coupled with visual errors and other factors, there is also the disadvantage of large measurement errors, And it is not suitable for batch testing on the production site

[0004] Although the measurement accuracy of the dial gauge can reach 0.001mm, the dial gauge cannot directly detect the value of the rough machining radius of curvature of the sapphire lens

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