Large-exit-pupil-diameter eyepiece system adaptive to large target surface

Abstract

The invention provides a large-exit-pupil-diameter eyepiece system adaptive to a large target surface. The eyepiece system sequentially comprises a first cemented lens group, a first single lens, a second single lens, a third single lens and a second cemented lens group from an object space to an image space, wherein the first glued lens group comprises a biconvex positive lens and a biconcave negative lens which are glued together, the first single lens is a biconcave negative lens, the second single lens is a biconvex positive lens, the third single lens is a biconvex positive lens, and the second glued lens group comprises a biconvex positive lens and a biconcave negative lens which are glued together. The eyepiece system has the advantages of being large in exit pupil diameter, small in number of lenses, small in size, light in weight, high in resolution ratio and the like, and has good imaging quality.

Description

technical field [0001] The invention belongs to the technical field of visible light optical systems, and in particular relates to an eyepiece system with a large exit pupil diameter adapted to a large target surface. Background technique [0002] As one of the basic and important components of visual optical instruments, the eyepiece is used to re-magnify the image formed by the front objective lens to meet the requirements of the human eye for target recognition. Generally speaking, the image of the eyepiece is at infinity, or In terms of the visual distance of the eyes, it is of great significance to study the characteristics of the eyepiece and the human eye. Considering that light from different angles is received by the human eye in different environments, when designing the eyepiece system, the exit pupil diameter is usually set at about 5mm. The exit pupil distance, that is, the distance between the exit pupil and the last lens of the eyepiece is generally 10mm to 2...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the research at home and abroad is focused on eyepiece systems with long exit pupil distance or field of view magnification, and less research on eyepiece systems with large exit pupil diameters.

[0004] Generally, the off-axis aberration of the eyepiece is relatively large, and there are certain difficulties in the correction of the off-axis aberration

This is because the eyepiece usually uses a relatively large field of view, and the diaphragm is outside the eyepiece optical system. This structure causes the projection height of the light on the lens to be relatively large, resulting in a large aberration outside the axis.

In order to balance these aberrations well, the optical structure of the eyepiece is usually complicated

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