Hyperboloid Fresnel lens structure and design method thereof

Abstract

The invention discloses a hyperboloid Fresnel lens structure and a design method thereof, the lens comprises a front surface and a rear surface, the two surfaces are Fresnel surfaces composed of a plurality of tooth-groove-shaped concentric ring belts, the tooth bottom substrate of each ring belt of the front surface and the rear surface is a curved surface substrate, the substrate of the front surface is a convex curved surface, and the substrate of the rear surface is a concave curved surface. The design freedom degree of the lens is larger, and the Fresnel structure molded surfaces are richer; the curved surfaces of the substrates on the two sides are on the same side, so that the substrate material removal rate is higher, the weight is lighter, the curved surface substrate design breaks through the limitation of a plane substrate, and the lens is smaller in occupied space and more compact in structure. The invention relates to a novel method for synchronously designing a substrate and a Fresnel microstructure, namely, on the basis of the same focus of each ring and the reference of the focus position and curvature of a middle ring belt, the curvature of each ring belt on the front surface and the back surface is calculated respectively, the focus of each ring belt is designed consistently, the focus can be further shortened while the condensation rate of a lens is ensured, and the lens is more compact. And the field of view becomes wider.

Description

technical field [0001] The application belongs to the field of optical technology, and in particular relates to a hyperboloid Fresnel lens structure and a design method thereof. Background technique [0002] It can be seen from the principle of optics that the thickness of the lens material itself is only related to the light transmittance such as reflection, and the curvature of the surface of a lens is the main factor that determines the refraction of the light beam by the lens. Fresnel lens is a lens that retains the surface curvature of ordinary lenses and removes the axial thickness of the lens. Compared with ordinary lenses, it has the advantages of light weight, thin thickness, and high light transmittance. Most of the existing Fresnel lenses are single-sided Fresnel lenses, and the Fresnel surface is a flat base, that is, the axis of the base plane is a straight line. [0003] A single-sided Fresnel lens means that one of the surfaces of the lens is a smooth surface...

AI Technical Summary

Problems solved by technology

However, the existing Fresnel lenses still have problems such as insufficient field of view, low design freedom, separation of substrate design and surface Fresnel micro-texture design, and the imaging quality needs to be further improved

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