TWO-CHANNEL COAXIAL CATADIOPTRIC LENS Russian patent published in 2008 - IPC G02B17/08 

FIELD: physics.

SUBSTANCE: catadioptric lens contains visible band catadioptric channel and lens "ТП" channel within central screening zone of catadioptric channel with common transit line. The Catadioptric channel contains four components, first of which is protective plane-parallel plate with cutout central zone. Second component contains a convex-plane lens and glued meniscus lens block convexly turned to image plane, and biconcave lens. Bottom surface of second component contains annular reflective coating. Third component is meniscus lens concave turned to subject space with reflective coating on second surface and cutout central zone. The fourth component consists of three single lenses, first of which is meniscus lens, second and third ones are biconvex. Lens "ТП" channel contains three meniscus lenses, first and third of which are concave turned to image plane and second one is convexly turned thereto.

EFFECT: higher covering power of lens "ТП" channel; greater effective relative aperture of visible band catadioptric lens while maintaining high quality of image in each channel.

4 dwg