REFLECTOR LENS Russian patent published in 2011 - IPC G02B17/06 

FIELD: instrument making.

SUBSTANCE: lens comprises the following components installed serially along with the direction of beam - main concave hyperboloid mirror with central hole, secondary convex hyperboloid mirror and lens system with optical force φ_l.s., made of two lens components and installed behind the main mirror. The first component with positive optical force φ_I, the second one in the form of a single lens with negative optical force φ_II. Optical forces of lens system and its components meet the following condition: where φ_m.s. - optical force of mirror system comprising main and secondary mirrors. Distance d between components meets the following condition: d=0.05-0.06d₀, where d₀ - distance between the main and secondary mirrors.

EFFECT: larger angular field with diffraction-limited quality of image in wide spectral range and provision of small longitudinal dimensions of length.

3 cl, 2 dwg, 9 app