Patent ID: 7114815
Filing Date: 2006-10-03
Classification: G02B,G03B,H04N

Abstract:
1. A lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein: said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device comprises a diaphragm mechanism having a substantially trapezoidal aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis; and said aperture is shaped such that sides of the aperture curve inward in accordance with relative contrast characteristics of the rays of light emitted from the display device approximately along lines that separate light rays having substantially similar levels of contrast; wherein the aperture comprises projecting portions that project in four directions when the display device displays images comprising parts having a relatively low contrast with regard to each other.