Optical visual apparatus

Details Optical visual apparatus Optical visual apparatus

1997-04-29

1999-03-23

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

G02B 2714

Patent

active

058868232

ABSTRACT:
The invention provides an optical visual apparatus which eliminates ghost light and is small in size and light in weight so that observation for a long time does not tire the eyes of a user and the user does not suffer from displacement of the apparatus on the head. A half mirror for reflecting image light from a two-dimensional display element is formed in a wedge-shaped profile having a varying thickness such that an opposing surface opposing to a half-coated surface is inclined with respect to the half-coated surface. The inclination angle of the opposing inclined surface and the Abbe's number of the half mirror are so set that ghost light and regular light are overlapped with each other at the position of an eye-ball of the user or the ghost light is reflected to the outside of the field of view of the user so that the ghost light may not be observed by the user.

REFERENCES:
patent: 5506728 (1996-04-01), Edwards
patent: 5546227 (1996-08-01), Yasugaki et al.
patent: 5621572 (1997-04-01), Fergason
patent: 5654827 (1997-08-01), Reichert
patent: 5712649 (1998-01-01), Tosaki

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