Light and small uncooled long-wave infrared dual-field lens and imaging method thereof

Abstract

According to the invention, a five-piece type structure is adopted, and a single negative lens is used as a zoom group to move along an optical axis to achieve two-gear zooming; generally, a large field of view is used for searching for a target in a large range, and then zooming is switched to a small field of view for accurate tracking and recognition. When the zoom group moves axially to approach the front fixed group, the field of view is large; when the zoom group moves away from the front fixed group, the field of view is small. And the system rear fixing group is combined with a zinc selenide material to reduce the chromatic aberration of the system and improve the image quality of the system. The focal power is reasonably distributed, and the aberration of the system is balanced bycombining with an even aspheric surface, so the structure of the optical system is simplified, and long and short focal lengths can be clearly imaged. The sensitivity of each optical element is reduced by adjusting the curvature and the thickness, so the lens is easier to process, assemble and adjust.

Description

technical field [0001] The invention belongs to the field of optical systems, and in particular relates to a light and small uncooled long-wave infrared dual-view lens and an imaging method thereof. Background technique [0002] The dual field of view infrared optical system has two fields of view with different sizes. The large field of view can be used to search for targets in a wide range, and the small field of view can be used to zoom in on targets, identify, track or aim at targets. Compared with the continuous zoom infrared optical system, the structure of the dual-field infrared optical system is relatively simple. The system can realize the switching between the dual-field of view only by changing the distance between the lens groups, and the imaging quality is good, and the switching speed is fast. It is easy to install and adjust, so it is widely used. [0003] Thermal imaging cameras used in handheld and airborne pods require the whole system to be simple in str...

AI Technical Summary

Problems solved by technology

The common uncooled long-wave infrared dual field of view system, due to the fixed position of the diaphragm, will increase the size and weight of the system when the focal length is increased; in addition, the zoom group and the focus group of the dual field of view system are set separately, requiring Install two motors to drive the zoom group and the focus group respectively, which will not only increase the weight of the mechanical parts, but also cause the weight of the whole machine system to be heavy, and also make the whole machine too bulky, which cannot meet the requirements of light and small size

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