Patent ID: 7703928
Filing Date: 2010-04-27
Classification: G03B

Abstract:
1. An optical projection apparatus, comprising: an illuminating system for providing a light beam; a reflective light valve, arranged on an optical path of the light beam, wherein the reflective light valve is used for converting and reflecting the light beam into a plurality of sub-image beams; an aspheric prism, arranged on the optical path of the light beam and located between the illuminating system and the reflective light valve, wherein the aspheric prism comprises a first curved surface, a second curved surface, a total-reflection surface, and an incident surface, wherein the first curved surface is opposite to the second curved surface, the total-reflection surface is connected to one rim of the second curved surface and beside the second curved surface, the incident surface connects the first curved surface and the total-reflection surface and is located beside the first curved surface, wherein the light beam is capable of being incident into the aspheric prism through the incident surface, and capable of being totally reflected by the total-reflection surface, and then capable of being incident to the reflective light valve through the first curved surface, wherein the sub-image beams are sequentially capable of passing through the first curved surface and the second curved surface, and wherein the total-reflection surface is located outside an optical path of the sub-image beams between the first curved surface and the second curved surface; a lens set, arranged on the optical path of the light beam and located between the reflective light valve and the aspheric prism, wherein the aspheric prism is used for receiving and transmitting the light beam to the lens set, the light beam is capable of being incident to the reflective light valve through the lens set, and the reflective light valve is capable of reflecting the sub-image beams to the first curved surface through the lens set; and a projection lens set, arranged on the optical path of the sub-image beams emitted from the second curved surface, wherein the projection lens set has a pupil at a position corresponding to the aspheric prism, and the lens set is used for converging the sub-image beams to the pupil and the sub-image beams are then capable of being incident to the projection lens set for imaging.