Patent ID: 8777421
Filing Date: 2014-07-15
Classification: G02B,G03B

Abstract:
1. A projection optical system comprising: a first optical system including a transmissive-refractive element; and a second optical system including a reflective-refractive element, wherein an image formed by a spatial light modulator is projected by the projection optical system on a projection surface, wherein a light beam that travels along an optical path that leads from the second optical system to the projection surface in an optical path between a center of the image formed by the spatial light modulator and the projection surface is projected at an angle with respect to a normal to the projection surface, and wherein an optical axis of the first optical system is folded to a folded position by an optical path deflecting unit in an area of the first optical system where the light beam entering the optical path deflecting unit is a converging light beam or a substantially parallel light beam.