Diffractive-refractive mixed type eyepiece used for curvature image plane with long exit pupil distance

Abstract

The invention relates to a diffractive-refractive mixed type eyepiece used for a curvature image plane with a long exit pupil distance, which belongs to the technical field of optical imaging systems. The traditional diffractive-refractive mixed type flattening eyepiece is not suitable for observing a curvature image plane, and the eyepiece structure has a room for further simplification. The diffractive-refractive mixed type eyepiece is a diffractive-refractive mixed type lens, wherein the base body of the diffractive-refractive mixed type lens is a refraction positive lens, and any one of two surfaces of the refraction positive lens is provided with a diffraction micro-structure to form a diffraction element; a distance from an eye position to the diffractive-refractive mixed type lens is an exit pupil distance a; the relation of the focal power phi of the diffractive-refractive mixed type lens, the focal power phi of refraction positive lens and the focal power phi of the diffraction element meets the requirement as below: 1, 0.92 / phi<0.96, 2, 0.04 / phi<0.08, 3, 0.94

Description

technical field [0001] The invention relates to a refraction-diffraction hybrid eyepiece with a long exit pupil distance for a curved image plane, which has the advantages of simple structure, light weight, small volume, satisfied main aberration requirements and high resolution, and belongs to the technical field of optical imaging systems. Background technique [0002] A Chinese invention patent with the patent number ZL200810051707.X and the name "Refractive-Diffraction Hybrid Flat Image Field Eyepiece" discloses a solution, see figure 1 As shown, the refraction-diffraction hybrid lens 1 and the refraction negative lens 2 are coaxially placed; the substrate of the refraction-diffraction hybrid lens 1 is a refraction positive lens, and the refractive power of the refraction There is a diffractive microstructure 5 on any one of the two surfaces of the positive refractive lens, and as an optical diffractive element, the refractive power of the diffractive element The refr...

AI Technical Summary

Problems solved by technology

[0003] However, in some cases, the image plane observed by the eyepiece is a curved image plane, and the refraction-diffraction hybrid flat image field eyepiece is not suitable, and there is still room for further simplification of the eyepiece structure

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