Design method for aspherical lenses

Abstract

The invention discloses a design method for aspherical lenses, which comprises following steps: a, an aspherical lens is provided and is provided with an inwards concave first lens surface, an outwards convex second lens surface and an optical area located at the center of the aspherical lens, wherein the second lens surface has multiple sections of curvatures, b, an (X, Y) coordinate system which adopts the center point of the second lens surface as an original point is set, and a plurality of coordinate points on an original curve of the second lens surface are measured, and c, curve fitting is realized for the original curve by the aid of an aspherical equation, coefficient values of items of the aspherical equation are solved, a curve drawn according to the aspherical equation is selected, and fitting error values of the curve and the original curve in the optical area are minimum. Due to the steps, the aspherical lens which meets requirements of diopter and transparent appearance is obtained.

Description

technical field [0001] The invention relates to an optical lens, in particular to a design method of an aspherical lens. Background technique [0002] At present, a large number of optical read-write heads, camera lenses, glasses and contact lenses sold on the market use aspheric lenses. Among them, traditional contact lenses use non-spherical lenses in order to take into account the accuracy of the diopter and the comfort of the user. The outer mirror surface of the spherical lens is designed with multiple curvatures from its center point outward, so that the outer mirror surface presents a discontinuous curved surface. Although the diopter in the optical zone of the central area of ​​the lens meets the requirements of the lens design, the appearance of the lens However, there are concentric circles, which cannot meet the requirement of a completely transparent lens appearance, and may easily cause a foreign body sensation when the user wears it. [0003] Therefore, the in...

AI Technical Summary

Problems solved by technology

When using polynomial equations for curve fitting, the higher the power of the polynomial, the better the curve fitting effect, but the last constant term often leads to excessive error at the periphery of continuous surfaces and multi-segment curvature mirrors. resulting in poor fitting effect

[0004] Therefore, some people in the industry began to try to fit the curve with the general even-order aspheric equation. Although the above-mentioned lack of using polynomial equations can be solved, the fitting error between the continuous curved surface and the multi-segment curvature mirror surface in the optical zone can be solved. The value is still large, and further improvement is urgently needed

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