Long-wave infrared mechanical passive athermalized vehicle-mounted lens and mounting method thereof

Abstract

The invention relates to a long-wave infrared mechanical passive athermalized vehicle-mounted lens and a mounting method thereof. An optical system of the long-wave infrared mechanical passive athermalized vehicle-mounted lens comprises a lens A with positive focal power, a rear lens group B with negative focal power and a lens C with positive focal power, which are arranged from the left side to the right side sequentially at interals in the incident direction of light, wherein both the lens A and the lens C are positive crescent lenses; the rear lens group B is a negative crescent lens; an air space between the lens A and the rear lens group B is 5.21mm; an air space between the rear lens group B and the lens C is 3.78mm; the long-wave infrared mechanical passive athermalized vehicle-mounted lens further comprises a main lens barrel; the lens A, the rear lens group B and the lens C are arranged from the left side to the right side sequentially at intervals in a way of being matched with the inner wall of the main lens barrel. Through thermal expansion and cold contraction of a material and application of a compensating shrapnel, an athermalized design structure is simpler, an overall product is smaller in structure, lighter in weight and high in reliability, and the structure is more convenient for a customer to use on the premise of meeting a requirement of a user on the imaging performance of the product.

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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