Full-set focusing type optical passive athermalized long-wave infrared security lens

Abstract

The invention provides a full-set focusing type optical passive athermalized long-wave infrared security lens. The lens comprises a main lens barrel, an outer cover and a lens group. The lens group is fixed in the main lens barrel. The main lens barrel is connected with the outer cover in the axially displaceable manner. The lends group comprises a negative lens A, a negative lens B and a positive lens C, wherein the three lenses are sequentially arranged in the light incidence direction. The negative lens A is made of the germanium glass. The negative lens B and the positive lens C are made of the chalcogenide glass. The air space between the negative lens A and the negative lens B is 4.69 mm. The air space between the negative lens B and the positive lens C is 0.7 mm. When the axial relative movement occurs between the main lens barrel and the outer over, the rear cut-off distance of the lens is changed. Therefore, a long-wave infrared non-cooled optical system can be realized based on the above simple lens structure.

Description

technical field [0001] The invention relates to the field of lenses, in particular to a whole group of focus-adjustable optical passive athermalized long-wave infrared security lenses. Background technique [0002] The long-wave infrared uncooled optical system has been widely used in both military and civilian fields, because the infrared lens has good anti-interference performance; it has a long distance at night; it has a strong ability to penetrate smoke, dust and haze; it can work all-weather and all-day; The advantages of multi-target panoramic observation, tracking and target recognition capabilities and good anti-target stealth capabilities have put forward higher and higher requirements for the imaging quality of the optical system. However, due to the thermal effect of infrared optical materials and mechanical materials, drastic changes in operating temperature will have a serious impact on the optical system, such as causing focal length changes, image plane drift...

AI Technical Summary

Problems solved by technology

However, due to the thermal effect of infrared optical materials and mechanical materials, drastic changes in operating temperature will have a serious impact on the optical system, such as causing focal length changes, image plane drift, and image quality degradation.

Therefore, in order to adapt to different ambient temperatures, the infrared lens is required to have a certain temperature adaptive ability; in addition, most of the lenses on the market have complex structures, processing difficulty and high cost, so the lens is also required to have a simple structure, easy processing, and practical Strong, no need for artificial multiple adjustments to keep the focal plane stable at the temperature of -30°C-80°C, how to realize the long-wave infrared uncooled optical system with a simple lens structure is a research direction

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