Common optical path dual-band confocal plane zoom optical system

Abstract

The invention provides a common optical path dual-band confocal plane zoom optical system, and aims at providing the zoom optical system which is simple in zoom structure, constant in F number, large in zoom, wide in continuous zooming focal length, and capable of effectively eliminating chromatic aberration between two bands and chromatic aberration within each band. The technical scheme includes that two mobile groups moving back and forth along an optical axis are arranged between an objective lens group (6) away from a focal plane, and a relay lens group (3); a chromatic aberration complementary method is adopted for the relay lens group in a three-separated-lens structure located on the back of a primary image plane (8) to eliminate residual chromatic aberration generated by optical lenses in front of the relay lens group; the primary image plane is imaged on the focal plane (1) again to accomplish intermediate-long infrared dual-band common optical path confocal plane secondary imaging; and meanwhile an imaged image is limited near the objective lens group (6) through an aperture diaphragm (2) at the position of a cold light aperture of a detector, and a clear aperture of the whole system is controlled. The common optical path dual-band confocal plane zoom optical system is simple in zoom structure, strong in inheritance, and small in adopted material.

Description

technical field [0001] The invention relates to an optical design of two bands of medium and long wave infrared. Specifically, the present invention relates to a dual-band (3.7 μm-4.8 μm and 7.7 μm-10.3 μm) optical system design using a common optical path and confocal plane of a transmission element and having a zoom function. Background technique [0002] The dual-band common optical path design used in the prior art is mainly a catadioptric system, a fixed-focus transmission system, and a transmissive dual-field optical system with optical compensation. Because the dual-band common optical path design of the transmission element is used, the inter-band Chromatic aberration and intra-band chromatic aberration are difficult to eliminate at the same time, so it is difficult to design a zoom lens with a long focal length and a small F number (F# is the aperture number, which is the reciprocal of the ratio of the relative aperture to the focal length, that is, F=f / D); For ...

AI Technical Summary

Problems solved by technology

The disadvantage of this system is that the structure is complex, the process of zooming is cumbersome and the image quality is not good enough

Most importantly, the F number of the optical system is large, which is not conducive to the need for high-quality imaging

Images