OPTICAL SYSTEM OF PROJECTION DEVICE Russian patent published in 1995 - IPC

FIELD: instrumentation engineering. SUBSTANCE: emission from lamp 2 is reflected by spherical reflector 1 and ellipsoid reflector 3 and hits optical reflector manufactured in the form of two rectangular prisms 5 placed on one shaft 6 and developed through angle of 90 deg relative to each other. Then reflected from faces 7 light passes through one of diaphragms 12 or 13, through condenser 14 or 15, frame window 16 or 17 to screen 20. EFFECT: simplified design, enhanced efficiency of optical system. 3 dwg