Fresnel lens and electronic device and optical module

Abstract

The invention discloses a Fresnel surface processing method, which comprises the following steps: S110) setting tooth tip parameters of a preset cross section curve intercepted along the diameter of a preset Fresnel curved surface, wherein the tooth tip parameters comprise tooth tip space, tooth tip height, a curve equation corresponding to the tooth tip and a preset maximum allowable machining error; S120) calculating a coordinate point of a transition circular arc uniquely corresponding to each tooth tip on the preset cross section curve according to the tooth tip parameters; S130) determining a standard cross section curve according to the coordinate point of the transition circular arc uniquely corresponding to each tooth tip; and S140) rotating the standard cross section curve for 180 degrees, and determining a standard Fresnel surface after circular arc transition processing. The invention provides the Fresnel surface processing method and a processing path generation method and a Fresnel lens, thereby preventing the case of abrupt change of the Fresnel surface processing path, realizing smooth processing and realizing controllable regulation of errors at the place of abrupt change of the Fresnel surface.

Description

technical field [0001] The invention relates to the technical field of parts manufacturing, in particular to a Fresnel lens, an electronic device and an optical module. Background technique [0002] Fresnel lens is also known as threaded lens. One side of its mirror surface is smooth, and the other side is engraved with concentric circles from small to large. Its texture is based on the interference of light and according to the requirements of relative sensitivity and acceptance angle. Designed. [0003] Fresnel lenses are widely used in beam shaping, information detection and imaging due to their light weight, short focal length, large aperture, thin thickness, long distance measurement, and strong light concentration. For example, slide projectors, film magnifiers, infrared detectors, etc. [0004] In order to obtain high-quality Fresnel lens devices, many researchers have carried out in-depth research on its high-efficiency and high-precision processing methods. Commo...

AI Technical Summary

Problems solved by technology

[0006] The traditional ultra-precision turning processing path has high processing efficiency and processing accuracy for devices with relatively smooth surfaces, but for surfaces that are not smooth or even have sudden changes, using the traditional ultra-precision turning processing path will cause machine tool vibration, resulting in processing The error increases, and even causes the tool to collide with the workpiece

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