DOUBLE-CHANNEL CATADIOPTRIC LENS Russian patent published in 2015 - IPC G02B17/08 

FIELD: physics.

SUBSTANCE: lens comprises a first mirror in the form of an off-axis fragment of a concave hyperbolic mirror, a lens aberration compensator of a visible channel comprising plane-convex and a biconvex lenses and a negative meniscus, a second mirror in the form of an off-axis fragment of a spherical convex mirror and a third mirror in the form of an off-axis fragment of a concave spherical mirror. The first surface of the first lens of the lens aberration compensator of the visible channel is coated with a spectrum-dividing coating which transmits radiation in the 450-1000 nm range and reflects in the 1500-1700 nm range. On the path of the reflected beams there is a lens aberration compensator of an infrared channel comprising three lenses in the form of off-axis fragments of biconvex, biconcave and biconvex lenses in the meridian section lying higher than the optical axis. The centres of curvature of all optical surfaces lie on a common axis. In the meridian section, the first mirror is lies lower than the optical axis and the second and third mirrors lie higher than the optical axis. Relationships given in the claim are satisfied.

EFFECT: high image quality in a wide spectral range of 450-1700 nm of the lens without central screening and improved manufacturability.

3 cl, 3 dwg, 3 tbl