Compact athermalization medium-wave infrared double-view-field rapid zoom lens

Abstract

The invention discloses a compact athermalization medium-wave infrared double-view-field rapid zoom lens, and solves the problem of athermalization of double view fields of a long-focal-length medium-wave spectrum band. According to an optical lens, a U-shaped structure folding light path is realized, and a front fixed lens group, a first reflecting mirror, a middle fixed lens group, a second reflecting mirror, a zoom switching lens group, a rear fixed lens group and a medium-wave refrigeration type infrared detector are sequentially arranged along a light incidence direction. The zoom switching lens group is arranged behind a primary image surface, the conversion of different view fields, namely the change of the focal length of the optical system, is realized through the cut-in / cut-out of the zoom switching lens group in an optical path, and the focal length of the lens is 400 mm and 200 mm. And a switching type zooming mode is adopted to realize a rapid zooming function, and the image surface consistency after zooming is relatively good. Four materials of Si, Ge, ZnSe and ZnS are adopted to realize athermalization zoom design of double view fields from -40 DEG C to +60 DEG C, and the double-view-field athermalization zoom lens is matched with an F / 4 refrigeration type detector and is used for a detector of which the image surface is not greater than 12.3 mm and the pixel size is not less than 15 microns.

Description

technical field [0001] The invention relates to the field of photoelectric imaging equipment, in particular to a compact athermalized mid-wave infrared dual-field-of-view rapid zoom lens. Background technique [0002] Optoelectronic equipment is mainly composed of optical lenses, detectors, peripheral circuits and equipment, and optical lenses are an important part. Infrared photoelectric equipment has the advantages of all-day, high resolution, and strong environmental adaptability, so it is widely used. In some security applications, mid-wave infrared has its special significance. For fast-moving targets, the design of dual-field of view greatly facilitates the monitoring of targets at different object distances. high demands. Due to the limited types of infrared materials and the large coefficient of thermal expansion, athermal design is relatively difficult, especially for zoom lenses. In addition, the depth of field of the optical lens will be relatively shorter as t...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of athermalization of the dual-field of view in the mid-wave spectrum segment with a long focal length, and to provide a compact athermalized mid-wave infrared dual-field of view fast zoom lens

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