F200mm refrigeration-type infrared athermalization lens

Abstract

The invention relates to an f200mm refrigeration-type infrared athermalization lens, and the optical system of the lens is sequentially provided with a meniscus lens A with the positive focal power, ameniscus lens B with the negative focal power, a meniscus lens C with the positive focal power, a secondary imaging plane D, a meniscus lens E with the negative focal power, a meniscus lens F with the positive focal power, a diaphragm G and an image plane H from the left to the right along the light. The lens is small and exquisite in structure, achieves the athermalization through electromechanical focusing, and is high in stability. The impact on the lens from the environment factors is small, and the lens just employs two types of optical materials, thereby greatly reducing the productionand processing cost.

Description

technical field [0001] The invention relates to an f200mm cooling type mid-wave infrared athermalization lens. Background technique [0002] The working environment of the optical lens is not constant. The curvature, thickness, spacing and refractive index of the optical element will change with the change of the ambient temperature. At the same time, the focal power of the optical element will change. Thermal expansion and contraction will occur, and eventually the optical system will produce aberrations and thermal defocus, which will affect the imaging quality. [0003] In order to enable the optical lens to be used normally under complex ambient temperatures, it is necessary to perform athermalization on the optical system. Common infrared athermalization methods include optical athermalization, mechanical athermalization, and optical-mechanical athermalization. However, the above methods mainly rely on the optical and thermal expansion characteristics of optical elemen...

AI Technical Summary

Problems solved by technology

However, the above methods mainly rely on the optical and thermal expansion characteristics of optical components and the thermal expansion properties of mechanical components to compensate for thermal defocus, which is highly dependent on the properties of the components themselves, poor adaptability to sudden changes in ambient temperature, high cost of optical lenses, and poor stability.

[0004] Most optical lenses adopt the optical structure of one-time imaging, which has a large aperture and large dimensions, which not only increases the overall weight of the lens, but also increases the volume and weight of the mechanical structure.

Images