A compact athermalized mid-wave infrared dual-field-of-view fast zoom lens

Abstract

A compact athermalized mid-wave infrared dual-field rapid zoom lens solves the problem of dual-field athermalization in the long-focus mid-wave spectrum. The optical lens realizes a U-shaped structure folding optical path, and the front fixed mirror group, the first reflector, the middle fixed mirror group, the second reflector, the zoom switching mirror group, the rear fixed mirror group, and the medium-wave cooling are arranged in sequence along the incident direction of light. type infrared detector. The zoom switching lens group is set behind the primary image plane, and the conversion of different field of view is realized through the cutting in / out of the zoom switching lens group in the optical path, that is, the change of the focal length of the optical system. The focal length of the lens is 400mm and 200mm. The switchable zoom mode is adopted to realize the fast zoom function, and the image plane consistency is better after zooming. Using Si, Ge, ZnSe, ZnS four materials to achieve dual field of view ‑40 ℃ to +60 ℃ athermal zoom design, matching F / 4 cooling type detector, used for image plane not larger than 12.3mm, pixel size Detectors not smaller than 15 μm.

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

Images