弯月镜结构补偿镜的折反型望远系统

目的：本文介绍的新型折反型望远结构相对于经典折反型望远镜在光学元件的材料，加工，装校，要求能实现易于加工，装校，但光学性能要求达到卓越级别。方法：本文提出了一种基于弯月镜结构补偿镜的球面折反型望远系统，提出的新结构将传统折反中的非球面球面化，完全去除了前置的大口径补偿镜，代以基于弯月镜结构的补偿镜，其位于主镜与次镜之间，构成了双通光路,相当于起到了两片透镜的作用.其直径仅是有效入瞳的1/3，因此其重量尺寸的相对前置大口径的R-C望远镜将非常的轻巧,支撑结构也变得简单易行，因此这样系统容易制造了。结果：此新型相机镜头的光学性能如下：其全视场为2°。相对孔径可以作到 F#7,遮拦比0.33，MTF衍射极限是0.40@70pl/mm，波长范围可以作到400nm-1100nm.设计，加工和装校后总的MTF>0.35@70pl。结论：新型光学系统使光学元件制造容易，装校的公差也比传统的R-C结构宽松2倍,。由于没有前置校正镜以至于机械结构更简单。所有的这些努力，终于使折反型望远镜能够容易制造,和普及。 关键字：弯月镜结构补偿镜；折反望远镜；球面主反射镜；球面次反射镜；无前置补偿镜。

A refract-reflect telescope with meniscus corrector

The deficiencies of the popular mass-produced telescopes of the Schmidt-Cassegrain design include their low aperture ratio and narrow spectral range. The novel systems for Cassegrain telescopes with a meniscus corrector proposed here are free of these deficiencies. Two such systems are described: a system with corrector lenses made from the same material and a system with corrector lenses made from different materials. The systems are technologically convenient (all the surfaces are spherical) and are distinguished by small lens diameters (down to 1/3 of the effective aperture), compactness, a high aperture ratio (up to 1:6.5-1:7), high-quality aberration correction, and a broad spectral range (400-1100 nm), which is sufficient for working with modern photographic materials and CCD arrays.