Uncooled long-wave infrared optical mechanical athermalizing lens and compensation adjustment method thereof

Abstract

The invention relates to an uncooled long-wave infrared optical mechanical athermalizing lens. The optical system of the lens is provided with a front lens group A with negative focal power and a back lens group B with positive focal power which are arranged in turn along an incident direction of light rays from the left to the right. A diaphragm is arranged between the front group A and the back group B. The front group A comprises a crescent lens A-1 and a negative crescent lens A-2 which are arranged from the left to the right in turn. The back group B comprises a biconvex lens B-1. Optical compensation is realized via an optical mechanical hybrid athermalizing technology. A telescoping mechanism group performs telescoping via the principle of thermal expansion and cold contraction. The front group moves, positions of the back group and a sleeve are relatively fixed, and displacement amount generated by the front group is compensated by a compensation elastic sheet after the front group moves. System distortion is relatively low, lens concentricity, precision and axial position are accurate, and the structure of the lens is enabled to be compact and beautiful to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of optical lens devices, in particular to an uncooled long-wave infrared optical-mechanical athermalized lens and a compensation adjustment method thereof. Background technique [0002] With the rapid development of science and technology, the continuous development and maturity of uncooled detector technology, long-wave infrared uncooled optical systems have been widely used in military and civilian fields. Since infrared optical materials and mechanical materials will produce thermal deformation when the temperature changes, drastic changes in operating temperature will cause changes in the focal length of the optical system, image surface drift, and image quality degradation. In order to eliminate or reduce the impact of temperature changes on the imaging of the optical system, corresponding compensation techniques must be used to keep the focal length of the optical system constant within a large tempera...

AI Technical Summary

Problems solved by technology

Because infrared optical materials and mechanical materials will produce thermal deformation when the temperature changes, the drastic change of working temperature will cause the focal length change of the optical system, the image surface is elegant, and the image quality is reduced.

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