Zoom eye lens with aspheric glass surface

Abstract

The invention relates to a zoom eye lens with an aspheric glass surface. The problem that the prior zoom eye lens is large in distortion and small in viewing angle is solved. The zoom eye lens is characterized in that the zoom eye lens sequentially comprises a positive focal power fixed eye aspheric first lens, a positive focal power image surface motion compensation lens group and a negative optical power zoom mobile lens group from the eye space to the object space; the aspheric surface is a second (or more)-power aspheric surface, is made of optical glass and satisfies the following conditions: the zoom ratio is 3, the short-focus angle of view is greater than or equal to 60 degrees, and the exit pupil distance is greater than or equal to 16mm. The zoom eye lens has the advantages of small distortion in a full focal length range, long exit pupil distance, flat field, clear imaging and short-focus wide angle; the aperture of the lenses and the length of the zoom eye lens can be better controlled; and the zoom eye lens is easy to clean and resistant to wear and has the capability of resisting harsh environment change.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a zoom eyepiece with a glass aspheric surface. Background technique [0002] In the prior art, the zoom eyepiece is generally composed of 4 to 9 lenses, and eyepieces without aspheric surfaces have relatively large distortion and relatively small viewing angles. For example, the patent publication number is CN1092180A, which provides a continuous zoom eyepiece with divisions for a visual optical instrument. A reticle group with a reticle guide screw is set between the groups, and its axial movement is controlled by the additional reticle curve groove of the zoom curve guide cylinder, and the composite real focus of the reticle and the eyepiece and the positive zoom lens group within the entire zoom range coincident with and conjugate to the virtual focal plane of the eyepiece system. And the use of aspheric structure lens is also limited to the cemented lens aspect, as the pat...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large distortion and relatively small viewing angle of existing zoom eyepieces, and provide a zoom eyepiece with a glass aspheric surface that has a reasonable structural design, a zoom ratio of not less than 3 times, and a small distortion in the entire focal length range.

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