Patent ID: 6185045
Filing Date: 2001-02-06
Classification: G02B

Abstract:
An image display apparatus comprising image display means that displays an image, and a projection optical system that projects said image, wherein said projection optical system has an edge portion having a refracting or reflecting action, said edge portion being arranged such that a refracting power for a periphery of any image display area is larger in a positive direction than a refracting power for a principal display area, wherein said projection optical system is an ocular optical system that projects said image onto a retina in an observer's eyeball and that includes a surface which has both transmitting and reflecting actions and which is tilted with respect to both said image display device and a visual axis so as to project an enlarged image of said image displayed by said image display device;wherein said ocular optical system has a concave mirror disposed to face said image display means and having a focal length f satisfying a condition of 15.ltoreq.f.ltoreq.60 millimeters so as to project an enlarged image of said image displayed by said image display means, said ocular optical system further having a semitransparent mirror disposed between said concave mirror and said image display means so as to lead light beams reflected by said concave mirror into said observer's eyeball, and said concave mirror having a configuration in which a point of intersection between a line normal to a plane tangent to a peripheral area of said concave mirror and an optical axis of said concave mirror is closer to said concave mirror than a point of intersection between a line normal to a plane tangent to a principal area of said concave mirror and the optical axis of said concave mirror, so that a refracting power for light rays in said peripheral area is larger in a positive direction than a refracting power for light rays in said principal display area.