Meniscus lens and processing method therefor

Abstract

The invention provides a meniscus lens and a processing method therefor. The processing method comprises the following steps: a) preparing a cylindrical optical glass blank; b) processing one side of the blank into a plane; c) processing the other side, opposite to the plane, of the blank into a first set plane through taking the plane as the standard, and conducting the first-time centering and edging through taking the first set plane or the plane; d) processing the plane into a second set plane through taking the first set plane as the standard; and e) conducting a second centering and edging through taking the first set plane or the second set plane as the standard. According to the processing method of the meniscus lens, the center aberration of the meniscus lens can be reduced, and the edge thickness difference Delta is controlled within the range less than 0.05.

Description

technical field [0001] The invention belongs to the optical cold processing technology, in particular to a meniscus lens and a processing method thereof, which is a commonly used optical element. Background technique [0002] The meniscus lens manufacturing methods commonly used in optical instruments are all selected optical glass materials that meet the requirements, and are completed by conventional optical glass cold processing processes such as blanking, rough grinding, fine grinding, and polishing, and only one centering and edging is done at the end. However, for meniscus lenses with nearly concentric circles or nearly the same radius (or similar specifications), since their requirements for center deviation are higher than those of other meniscus lenses, it is not suitable to perform centering and edging according to the above general method . The edge thickness difference of the meniscus lens processed by the general method is difficult to meet the design requireme...

AI Technical Summary

Problems solved by technology

When the width of the platform surface is large, it is difficult to ensure that the geometric center of the concave surface coincides with the geometric center of the outer circle of the part by traditional methods, and it is also difficult to ensure the perpendicularity between the platform surface and the outer circle

For the meniscus lens processed in this way, the side thickness difference and the perpendicularity between the platform surface and the outer circle are difficult to meet the design requirements

[0004] In the patent document CN 101791774A, a processing method of a negative crescent optical lens is disclosed. The processing mold adopted is a false rigid disk without counterbore, and the periphery of the workpiece is in rigid line contact with the spherical concave / convex surface of the mold. is the main feature, but does not solve the above-mentioned problems existing in the prior art

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