Patent ID: 8113663

Claim:
A projection-type image display apparatus, comprising: a first optical system, including an image display element, a screen, and plural numbers of lenses, for projecting a display image on said image display element, enlargedly; and a second optical system for projecting an enlarged image from said first optical system, at a predetermined angle to a normal line on said screen; wherein said second optical system includes an optical element therein, having a curved surface for reflecting the enlarged image from said first optical system, so as to guide onto said screen, and a portion of said optical element, for reflecting a light at a first optical distance, is curved to direct a concave into a reflection direction thereon, while a portion of said optical element, for reflecting a light at a second optical distance shorter than said first optical distance, is curved to direct a convex into a reflection direction thereon, if assuming that an optical path length of the light incident upon said screen is the optical distances.