A long-wave infrared mechanically passive athermal vehicle-mounted lens and its installation method

Abstract

The invention relates to a long-wave infrared mechanically passive athermal vehicle-mounted lens and an installation method thereof. The optical system of the lens includes lens A with positive refractive power and optical focal length arranged at intervals from left to right along the incident direction of light. The rear lens group B with negative power and the lens C with positive refractive power, both the lens A and the lens C are positive crescent lenses, and the lens rear group B is a negative crescent lens; the lens A and the lens rear The air gap between group B is 5.21mm, and the air gap between the lens rear group B and C lens C is 3.78mm; the lens also includes a main lens barrel, the lens A, lens rear group B and lens C It is arranged in cooperation with the inner wall of the main lens barrel at intervals from left to right. The invention makes use of the thermal expansion and contraction properties of the material and the application of the compensation shrapnel to make the athermal design structure simpler, the overall product structure smaller, lighter in weight, and high in reliability, and to meet the user's requirements for product imaging performance , the structure is also more convenient for customers to use.

Description

technical field [0001] The invention relates to the field of optical lenses, in particular to a long-wave infrared mechanically passive athermal vehicle-mounted lens and an installation 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 both 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 range to ...

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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