Three-view-filed axial zoom infrared optical system

Abstract

The invention relates to a three-view-filed axial zoom infrared optical system. The three-view-filed axial zoom infrared optical system comprises a front mirror set, a reflecting mirror set and a rear mirror set which are arranged in sequence. The front mirror set comprises an object mirror, a zoom mirror, a compensating mirror and four fixed mirrors, and the object mirror, the zoom mirror, the compensating mirror and the four fixed mirrors are coaxially arranged in sequence. The reflecting mirror set comprises three sequentially arranged reflecting mirrors. The rear mirror set comprises two convergent mirrors which are coaxially arranged in sequence. The rear mirror set is located on the reflecting optical path of the third reflecting mirror. According to the three-view-filed axial zoom infrared optical system, the three view fields can be changed just through axial movement of the zoom mirror and the compensating mirror, the compensating mirror only has two positions in the three-view-filed state, the compensating mirror also serves as a focusing mirror to compensate defocus caused by temperature, and therefore control difficulty is greatly lowered. The three fixed reflecting mirrors are adopted, an object image can be rotated through space bending, the problem that the direction of an adopted detector refrigerating machine is the same as the direction of a long edge is solved, the risk of pipe bending of the detector refrigerating machine is avoided, and the three-view-filed axial zoom infrared optical system is compact in structure, is provided with a simple movement mechanism and achieves miniaturization and low weight.

Description

Technical field [0001] The invention relates to a three-field axial variable magnification infrared optical system, which belongs to the technical field of applied optics. Background technique [0002] At present, there are three ways of zooming in the infrared zoom optical system: radial cutting, rotating zooming and axial zooming. The radial cutting method adopts different zoom lens groups to switch radially to realize the conversion of multiple fields of view. Rotational zoom mode adopts coaxial rotation switching mode of different zoom lens groups to realize the conversion of multiple fields of view. The advantages of the above two methods are that the narrow field of view has the highest optical axis accuracy and the highest optical transmittance, but the disadvantage is that the system's radial size is too large and the movement mechanism is complicated. The axial zoom method adopts the relative position movement of the zoom lens and the compensation lens to realize the c...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a three-field axial variable power infrared optical system to solve the problems of the existing infrared variable power optical system with too large radial size and complex movement mechanism

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