DOUBLE MIRROR CATADIOPTRIC OBJECTIVE LENS SYSTEM WITH THREE OPTICAL SURFACE MULTIFUNCTION COMPONENT

摘要

A double mirror objective lens system (10) uses a three optical surface refractor (20) incorporating a convex mirror (222) into a right surface thereof (22) that reflects incident light to a concave mirror (40), which reflects the light back through the refractor (20) and on toward a focal point of the system (50). This arrangement yields better resolution images with low spherical aberration, minimal chromatic aberration, and long working distance. A variation of the invention includes another refractor, a right surface of which carries the concave mirror to form a Mangin mirror. This variation of the invention has even less aberration over increased wavelength range due to better corrected chromatic aberration.