一种无调焦变倍机载电视成像光学系统

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一种无调焦变倍机载电视成像光学系统

一种无调焦变倍机载电视成像光学系统，其由依次共光轴设置的组合物镜( 1 )、第一折转反射镜( 2 )、变倍镜( 3 )、补偿镜( 4 )、调光机构( 5 )、会聚镜组( 6 )、第二折转反射镜( 7 )和CCD探测器( 8 )组成。其中，所述变倍镜( 3 )位于物镜组( 1 )焦点的内侧，其为一大曲率双胶合负透镜，并由一凹透镜和负弯月镜组成，通过所述变倍镜( 3 )的轴向移动能实现机载电视成像的变倍以及大视场扫描和小视场跟踪。所述补偿镜( 4 )为一正双胶透镜，其前焦点始终与变倍镜( 3 )的后焦点重合。所述调光机构( 5 )位于补偿镜( 4 )后的平行光路上。本发明可以实现机载狭小空间内的变倍，在机载环境下不需要调焦，即可获得稳定图像和清晰成像。

Focusing-free zoom airborne television imaging optical system

A focusing-free zoom airborne television imaging optical system is composed of a combination objective lens (1), a first turning reflection mirror (2), a zoom lens (3), a compensation mirror (4), a dimming mechanism (5), a converging lens set (6), a second turning reflection mirror (7) and a CCD detector (8) which are sequentially and coaxially arranged. The zoom lens (3) is located on the inner side of the focus point of the objective lens set (1), is a large-curvature double-glued negative lens and is composed of a concave lens and a negative meniscus lens, and through axial moving of the zoom lens (3), zoom of airborne television imaging, large-view-field scanning and small-view-field tracking can be achieved. The compensation mirror (4) is a positive cemented doublet, and the front focus point of the compensation mirror is always superimposed with the rear focus point of the zoom lens (3). The dimming mechanism (5) is located on a parallel optical path behind the compensation mirror (4). Zoom in the airborne narrow space can be achieved, and a stable image and clear imaging can be obtained without focusing in the airborne environment.