CATADIOPTRIC LENS (VERSIONS) Russian patent published in 2012 - IPC G02B17/08 

FIELD: physics.

SUBSTANCE: according to the first version, the lens consists of a first mirror, a positive meniscus, a second mirror, a Mangin lens whose mirror surface is the third mirror, a plane-parallel plate and an aperture diaphragm. According to the second version, the lens consists of a first mirror, a positive meniscus, a Mangin lens whose mirror surface is the second mirror, a third mirror, a plane-parallel plate and an aperture diaphragm. According to the third version, the lens consists of a first mirror, a biconcave lens, a Mangin lens whose mirror surface is the second mirror, a second Mangin lens whose mirror surface is the third mirror, a plane-parallel plate and an aperture diaphragm. The first mirrors of the lens in all three versions are in form of an off-axis fragment of a concave spherical mirror. The positive menisci and the biconcave lens are axially symmetric. The Mangin lens in the first version and the second Mangin lens in the third version are in form of an off-axis fragment of a negative meniscus. The Mangin lens in the second version and the first Mangin lens in the third version are in form of axially symmetric menisci.

EFFECT: avoiding central screening with high image quality in a wide spectral range and high manufacturability.

6 cl, 6 dwg, 1 tbl