Refraction and reflection type large aperture and large field of view imaging system

Abstract

The invention relates to a refraction and reflection type large aperture and large field of view imaging system. The refraction and reflection type large aperture and large field of view imaging system is characterized in that a refraction type correction plate, a reflection type primary mirror and a refraction type correction mirror group are successively arranged along an optical axis from the outside to the inside; the central area of the second surface of the correction plate is plated with a reflective coating layer, and becomes a reflection type secondary mirror; an incident light beam irradiates to the reflection type primary mirror through the refraction type correction plate; the reflection type primary mirror reflects the incident light beam to the reflection type secondary mirror; and the reflection type secondary mirror reflects the light beam to the refraction type correction mirror group, and then the light beam passing through the refraction type correction mirror group is converged on a focal plane of an optical system. The refraction and reflection type large aperture and large field of view imaging system sets the refraction type correction plate within the focus of a reflection type spherical main mirror and takes the central area of the second surface of the correction plate as the reflection type secondary mirror and the diaphragm, thus having the advantages of ultra-short lens barrel and large field of view, and being able to be widely applied to the astronomy, aviation, security and protection, and other photoelectric imaging fields. The refraction and reflection type large aperture and large field of view imaging system can realize aberration reducing design for a 11DEG-15DEG field of view. However, the field of view for a traditional refraction and reflection type imaging system is only 3DEG-4DEG.

Description

technical field [0001] The invention relates to a catadioptric large-diameter and large-field imaging system, which belongs to the technical field of photoelectric imaging. This invention is funded by the National Natural Science Foundation of China (11273040). Background technique [0002] Optical imaging systems can be divided into three types: refractive, reflective and catadioptric, each with its own characteristics: [0003] Refractive optical imaging system is composed of transmissive optical elements, and the aberration is corrected through the curvature, refractive index and dispersion coefficient of the optical elements. The advantage is that there is no central occlusion, and there are many optimization parameters available to achieve a larger field of view. The disadvantage is that it is limited by material uniformity, stress, processing, gluing and other processes, and the caliber is relatively small. [0004] The reflective optical imaging system uses the surf...

AI Technical Summary

Problems solved by technology

Aiming at the problems of small field of view and long length of optical system in the current catadioptric optical imaging system, the present invention designs a catadioptric optical imaging system with large diameter, large field of view and short lens barrel

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