Optical system for an lcd projector

摘要: An optical system for an LCD projector comprising illuminating device, infrared filter, and a projecting lens comprises 45° horizontally inclined blue light tranmission green reflection mirror, red image transmission three total mirrors, condensing lenses, panels, separates red, elements from the having been transmitted through then reemerging in respective colors by using separated order to compose reemerged image. The projects composed on screen as enlarged according this invention can provide compensation of radiation path considerably longer than those paths, high luminance due metal halide lamp, low manufacturing cost, good resolution power because reducing vignetting, also compactness its projection lens.