MIRROR LENS Russian patent published in 2007 - IPC G02B17/06 

FIELD: optical engineering.

SUBSTANCE: mirror lens has first convex mirror mounted on path of beam, as well as second concave mirror with central opening, third convex mirror and fourth concave mirror with central opening. Radiuses of curvature of mirrors are selected in such a way that beams directed on first mirror passes through opening of the second one; beams from fourth mirror passes outside external boundaries of third mirror to reach the boundaries of placement of mirrors. First mirror has central opening. Beam directed onto third mirror passes through opening in the first mirror or outside its external boundaries. Beams go outside boundaries of placement of mirrors to multichannel unit of receivers. Mirrors are disposed one relatively other in the following sequence: second, fourth, first, third or fourth, second, first, third.

EFFECT: wider field of view; magnified relative aperture; images are placed outside limits of placement of mirrors; small aberrations of images; no need in non-spherical surfaces.

2 dwg