WIDE-ANGLE REFLECTING TELESCOPE OBJECTIVE Russian patent published in 2003 - IPC

FIELD: optics. SUBSTANCE: reflecting telescope objective consists of main mirror coming in the form of flattened spheroid and afocal correction element mounted in front of main mirror in path of ray at small distance from focal plane of main mirror. Correction element is mirror element with relief applied along center-symmetric zones and is inclined with reference to incident beam through angle ε, that is tied with key parameters of system by following relation where D is diameter of corrector; f is focal distance of main mirror; ω is half-angle of field of vision; Δ is distance from surface of correction element to focal plane. Two light-protective blends are placed in front of corrector in path of ray. EFFECT: expanded spectral range, removed glares with simultaneous reduction of requirements to quality of materials of optical elements, improved adaptability to manufacture, improved testing. 2 dwg