Switching type zooming athermalization type long-wave infrared zoom lens

Abstract

The invention provides a switching type zooming athermalization type long-wave infrared zoom lens, and solves the problems that the view field angle of an existing athermalization design system is generally large, and the passive athermalization design of the system is difficult to realize by a small view field design system. The athermalization type long-wave infrared zoom lens comprises a lens cone, a front fixed lens group, a first reflecting mirror, a rear fixed lens group, a second reflecting mirror, a zoom lens group, a secondary imaging lens group and a long-wave infrared detector assembly, the front fixed lens group, the first reflecting mirror, the rear fixed lens group, the second reflecting mirror, the secondary imaging lens group and the long-wave infrared detector assembly are sequentially arranged along a light path, and the zoom lens group is arranged on the light path between the second reflecting mirror and the secondary imaging lens group and can be cut in and cut out of the light path; the zoom lens is a long-wave infrared lens which has a small field of view, a compact structure and a simple zoom structure and can realize switching type zoom, and the lens realizes passive athermalization design and enhances adaptability to environment temperature change.

Description

technical field [0001] The invention belongs to the field of infrared thermal imaging, in particular to a switchable zoom adiabatic long-wave infrared zoom lens. Background technique [0002] The long-wave infrared imaging system mainly uses the thermal energy radiated by the object itself for imaging, so as to realize the long-distance detection of the object. It is mainly used in fire early warning detection, emergency rescue, high-end imaging monitoring and other fields. The long-wave infrared dual-field of view system has two imaging fields of view of different sizes, which can realize wide-range perception and long-distance detailed inspection of the target area. Compared with fixed-focus systems, it has greater advantages in practical applications and has become the current Research hotspots. [0003] Chinese patent CN 102269871 A discloses a two-color dual-field infrared imaging optical system, which realizes a dual-field system design of 9°×6.75° / 3°×2.25°; Chinese p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the field of view angle of the existing athermal design system is generally large, and the system designed with a small field of view is difficult to realize the passive athermal difference design of the system, and to provide a switchable zoom athermal difference type LWIR Zoom Lens

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