Continuous zoom mid-wave infrared optical system with ultra-long focal length

Abstract

The invention relates to a continuous zooming medium wave infrared optics system with super-long focal length. A varifocus objective group comprises a main objective, a zooming lens, a compensating lens, a first fixing lens and a second fixing lens. A reflecting lens group comprises a first reflecting lens and a second reflecting lens. A secondary imaging back group comprises a first back group lens, a second back group lens and a third back group lens. The varifocus objective group carries out converging imaging on light from an object, the imaging face is between the first reflecting lens and the second reflecting lens. The first back group lens, the second back group lens and the third back group lens carry out imaging again on an image formed by the varifocus objective group to a final image face. The continuous zooming medium wave infrared optics system has the main advantages that image face object size can be changed continuously, a target is not lost during imaging at any focal length position from a short focus to a long focus, action distance is long, target detail observing capacity is high, imaging quality is high, aberration correction is good, imaging is clear and sharp in the whole course of zooming, the compensating lens also has a focusing function, the number of moving units is reduced, the system structure is simplified, and equipment reliability is improved.

Description

technical field [0001] The invention relates to a continuously zooming mid-wave infrared optical system with an ultra-long focal length, which is widely used in a cooled mid-wave infrared focal plane detector. Background technique [0002] Infrared imaging system has its own excellent characteristics, such as passive working mode, it will not be interfered by the enemy's electronic interference, good concealment; intuitive image, easy to observe; high precision; good low-altitude detection performance, etc. It has been widely used in military fields such as guidance. In recent years, with the rapid development of infrared optical technology and the continuous expansion of its application range, the demand for infrared continuous zoom optical system is increasing. This is because the infrared continuous zoom optical system can realize the continuous change of the focal length within a certain range, and the image plane is stable and maintains good image quality during the zo...

AI Technical Summary

Problems solved by technology

However, due to the long focal length continuous zoom infrared optical system with long focal length and large aperture, aberrations are not easy to correct, it is difficult to realize continuous zooming within a large focal length range, and it is necessary to meet the design requirements of 100% cold aperture of medium-wave cooled detectors, and to eliminate cold reflections and other stray light, it is very difficult to realize

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