Aspherical focusing lens

Abstract

The invention discloses an aspheric surface collective lens, which comprises the first aspheric surface and the second aspheric surface. Wherein the refractive index change is in 1D range; the first aspheric surface is fixed; the invention has at least 7 visual fields, to make the target ti zero of performance function (as formula), while wi is weight factor, m is optimized term number, ei is one optical aberration and ti is the target of one optical aberration value.

Description

【Technical field】 [0001] The invention relates to a lens, in particular to an aspherical lens. 【Background technique】 [0002] At present, the lenses used in optical devices such as optical reading heads, camera lenses, and spectacle lenses generally include spherical lenses or aspheric lenses. [0003] For spherical lenses, since the two refractive surfaces are spherical, it is easier to manufacture and process. However, for spherical converging lenses with a thick center and thin edges, as the refractive index (also called power) of the lens increases, the center of the lens will thicken significantly. The refractive index of the lens refers to the back vertex value of the lens, and its value is equal to the reciprocal of the paraxial back vertex focal length of the lens measured in meters (the distance from the vertex of the lens' image-side surface to the image-side focus). It can be calculated by formula (1): [0004] F v ...

AI Technical Summary

Problems solved by technology

[0034] Therefore, the aspheric converging lens is optimized with five or six fields of view, which cannot eliminate aberrations well.

Images