Patent ID: 7922341
Filing Date: 2011-04-12
Classification: G02B,G03B

Abstract:
1. A projection optical system for use in an image projection apparatus projecting an image of an object and forming a final image on a plane, the projection optical system comprising: first and second optical systems arranged so that the first optical system is closer to the object than is the second optical system; wherein the first optical system includes at least one dioptric system and has positive power, the second optical system includes at least one reflecting surface having positive power, the image of the object is formed as an intermediate image in an optical path of the first and second optical systems, and the intermediate image is magnified and projected, and the second optical system is configured so that an angle of incidence to a projection surface on the plane is greater at a position farthest from the object than at a position closest to the object on the final image.