F35mm mechanical passive-type athermalization lens and assembly method therefor

Abstract

The invention relates to an f35mm mechanical passive-type athermalization lens and an assembly method therefor. The lens comprises an optical system and a mechanical structure. The optical system of the lens is sequentially provided with a positive lens A, a negative lens B and a positive lens C in an incident direction of light. The mechanical structure of the lens comprises a front lens cone and a main lens cone, wherein the front and main lens cones are sequentially arranged in the incident direction of light. The front lens cone is fixedly connected with the main lens cone, and the interior of the front lens cone is provided with the positive lens A. The interior of the main lens cone is provided with the negative lens B and the positive lens C. The lens reasonably distributes the focal power in a design process of an optical-mechanical structure, and the positive lens A is pushed to move through the combination of lens cone materials with different expansion factors, so as to compensate image plane drift, achieving temperature self-adaption mechanical passive-type athermalization, and enabling an infrared optical system to be capable of maintaining good imaging quality in a larger temperature range. The lens can be matched with a long-wave infrared non-refrigeration type 640*480 17 micron detector, and carries out recording and monitoring of actual conditions.

Description

technical field [0001] The invention relates to an f35mm mechanical passive athermalization lens and an assembly method thereof. Background technique [0002] Under different ambient temperatures, optical materials and mechanical materials will expand with heat and contract with cold, which will change the thickness of the lens and the air gap, and the refractive index of the optical material will also change with temperature, which will cause the best image plane of the system to deviate , reduce the optical imaging quality, blur the image, reduce the contrast, and finally affect the imaging performance of the lens. [0003] Because the infrared lens has good anti-interference performance; long distance at night; strong ability to penetrate smoke, dust and haze; can work all-weather and all-day; has multi-target panoramic observation, tracking and target recognition capabilities and good anti-target stealth capabilities, etc. Advantages, the application of infrared lenses ...

AI Technical Summary

Problems solved by technology

In order to adapt to special applications, it is also required that the lens can adapt to harsh environments and have the ability to adapt to temperature. However, there are few types of such lenses on the market at present, which cannot meet the needs of the market.

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