An ultra-compact three-band co-telescopic optical system

Abstract

The invention relates to an ultra-compact three-band co-telephoto optical system. A primary mirror and a secondary mirror form a telephoto primary image point condensing lens group, a first eyepiece, a second eyepiece, a third eyepiece, a fourth eyepiece and a fifth eyepiece. The eyepiece and the sixth eyepiece form a telescopic eyepiece group. The anti-scan mirror is located in the parallel light path after the telephoto. The first beam splitter transmits medium wave infrared and reflects TV and short wave infrared, and the second beam splitter transmits short wave infrared and reflects TV band. Can be used for airborne fast search, track and sight systems. The telescopic system adopts the configuration of a cassette and a lens group, making full use of the characteristics of the main mirror opening and the secondary mirror blocking of the cassette. The lens group is located behind the secondary mirror and the opening of the main mirror, and a beam splitter is placed behind the main mirror for beam splitting. , the entire telescopic system has an ultra-compact structure, which can greatly reduce the space volume of the three-band co-aperture optical system.

Description

technical field [0001] The invention belongs to the design technology of airborne multi-band common optical path imaging, and relates to an ultra-compact three-band common telescopic optical system, which is characterized in that the structure is compact, and the telescopic eyepiece groups are concentrated inside the cassette. The aberration and chromatic aberration of the wide-band telephoto common optical path are corrected by using materials with wide-band transmission. Background technique [0002] The airborne day and night sighting system is developing in the direction of multi-band and high scanning speed. The optical system generally requires multiple bands to work at the same time. The characteristics of different bands of the target are used to increase the probability of detection and recognition, and the operating distance is required to be longer. The aperture of the optical system needs to be larger. The multi-aperture system cannot achieve simultaneous large-a...

AI Technical Summary

Problems solved by technology

Among them, the aberration correction ability of the two-mirror configuration is limited, and it is difficult to achieve a large aperture, generally less than 150mm. Off-axis three-mirror and off-axis four-mirror mirrors are all off-axis, which is difficult to process and assemble, and requires a large space volume.

Aiming at the problems existing in the current common telephoto system, an ultra-compact three-band telescopic optical system with card and lens is proposed. The wide-band chromatic aberration is large, and the aberration is difficult to correct. A set of wide-band lens groups is used as the telescopic eyepiece group. Correct aberrations and chromatic aberrations, reduce the number of lenses used through aspheric surfaces, and improve telephoto transmittance. The eyepiece group is located at the opening of the card-type primary mirror, which greatly compresses the space volume of the entire optical system

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