Method for designing non-spherical lens

Abstract

A method for designing nonspherical lens includes setting dioptre and refractive index as well as diameter of nonspherical lens, applying spherical design to design two curvature radius for nonspherical lens to let it realize set dioptre, using two said curvature radius to make visual field distortion to be minimum value and using lens nonspherical design formula to design the first nonspherical surface and the second nonspherical surface.

Description

【Technical field】 The invention relates to a design method of an optical lens, in particular to a design method of an aspheric lens. 【Background technique】 At present, the lenses used in optical devices such as optical reading heads, camera lenses, and spectacle lenses generally adopt spherical or aspheric designs. When the lens adopts a spherical design, it is easy to manufacture and process because the two refracting surfaces of the lens are designed to be spherical. However, a spherical diverging lens with a thin center and a thick edge or a spherical converging lens with a thick center and thin edge will thicken significantly at the edge or center of the lens as the refractive index (also called power) of the lens increases. 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 su...

AI Technical Summary

Problems solved by technology

However, the constant value of the quadratic curve in this design is 1, indicating that the thickness of the aspheric lens cannot be effectively reduced. If r has the power of 12, it is difficult to effectively eliminate oblique astigmatism and refractive index error in the designed aspheric lens. and distortion