Patent ID: 8159624
Filing Date: 2012-04-17
Classification: G02F,G03B,H04N

Abstract:
1. A projector, comprising: an illumination system emitting an illuminating light having a system optical axis as a central axis thereof; a polarizing beam splitter allowing a light from the illumination system to pass therethrough and reflecting the light; a reflective liquid crystal panel modulating, according to an image signal, the light which has passed through the polarizing beam splitter; a retarder placed between, the reflective liquid crystal panel and the polarizing beam splitter; and a projection system projecting the light reflected from the polarizing beam splitter, wherein the projection system has an optical axis which does not coincide with the system optical axis and is parallel to the system optical axis, the polarizing beam splitter is placed in such a way that a normal direction of a substrate plane of the polarizing beam splitter and the system optical axis form an angle of about 45 degrees, and the retarder is placed and tilted in a direction in which the following conditional expression is satisfied, denoting a point where the normal drawn from the center of a substrate plane of the retarder and the substrate plane of the polarizing beam splitter intersect as A, a point where the substrate plane of the polarizing beam splitter and the system optical axis intersect as B, a point where the substrate plane of the polarizing beam splitter and the optical axis of the projection system intersect as C, a distance between the point A and the point C as AC and a distance between the point B and the point C as BC: