Long-wave infrared mechanical passive type athermalized lens and compensation adjusting method thereof

Abstract

The invention relates to a long-wave infrared mechanical passive type athermalized lens. An optical system of the lens sequentially includes, along the incident direction of light from left to right, a lens group front group A with negative focal power and a lens group rear group B with positive focal power. The front group A comprises a crescent lens A-1. The rear group B comprises a concave crescent lens B-1 and a crescent lens B-2 in sequence from left to right. The long-wave infrared mechanical passive type athermalized lens has the advantages of relative large aperture, IP67 waterproof and dustproof performance, low distortion, athermalized compensation, etc. Through the characteristic that material expends with heat and contracts with cold and also through applications of compensation elastic pieces, an athermalizized design structure is simpler, the structure of an entire product is smaller and lighter, the steady imaging of an optical axis is clearer and high in reliability, the requirement of users for the imaging performance of products is met, and the lens is more convenient to use by users in terms of structure.

Description

technical field [0001] The invention relates to the technical field of optical lens devices, in particular to a long-wave infrared mechanically passive athermalized lens and a compensation adjustment method thereof. Background technique [0002] With the rapid development of science and technology and 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 temperature ...

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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