PRISM TO ROTATE IMAGE Russian patent published in 1997 - IPC

FIELD: optics. SUBSTANCE: invention is intended for rotation of image in channels of optical devices operating in parallel bundles of rays. Prism to rotate image is made of two identical components. Major section of each of them presents parallelogram. Components have one reflecting and two refracting faces, are optically intercoupled by opposite reflecting faces in plane matching optical axis and are positioned in symmetry relative to this axis. Angle B between refracting and reflecting faces is determined from equation 2B+arcsin(1/n cos B)=90 deg, where n is refractive index of material of prism. EFFECT: enhanced functional stability. 1 dwg, 1 tbl