Patent ID: 6342871
Filing Date: 2002-01-29
Classification: G02B

Abstract:
In an image display apparatus having an image display device and a viewing optical system that leads an image formed by said image display device to a position where an eyeball of an observer is placed,the improvement wherein said viewing optical system has at least: an image source-side reflecting surface having a decentered curved surface configuration that gives a power to a light beam emitted from said image display device when the light beam is reflected by said decentered curved surface, said image source-side reflecting surface further having a rotationally asymmetric surface configuration that corrects decentration aberrations produced by reflection at said decentered curved surface; a semitransparent reflecting surface with half-mirror coating that transmits or reflects the light beam reflected from said image source-side reflecting surface; and a concave reflecting surface that forms a folded optical path between said concave reflecting surface and said semitransparent reflecting surface, said concave reflecting surface having a concave surface directed toward said semitransparent reflecting surface; wherein an enlarged intermediate image of the image of said image display device is formed between said image source-side reflecting surface and said semitransparent reflecting surface.