Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Combined
Patent
1997-07-31
1998-11-03
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Combined
G02C 100
Patent
active
058317120
ABSTRACT:
An optical apparatus, e.g. a head-mounted display apparatus, which enables observation of a favorable image by eliminating flare and ghost images caused by unwanted light coming in through the gap between an observer's eyeball and an optical unit of the apparatus. Display light of an electronic image emanating from a liquid crystal display device and outside world light coming in through a liquid crystal shutter (7) are p-polarized light and therefore pass through a polarizing plate (8) and reach an observer's eyeball (1) without any loss. Meanwhile, light that undesirably comes in through the gap between the observer's face and the optical unit is generally natural light and hence unpolarized. Therefore, when the unwanted light passes through the polarizing plate (8) after being reflected from the eyeball (1) or a mirror (3), the light intensity reduces to 1/2. Although the light is successively reflected by the concave mirror (3) and the half-mirror (2) to reach the eyeball (1), the intensity ratio of the ghost image to the normal electronic image becomes 1/2. Thus, an electronic image of improved contrast can be observed.
REFERENCES:
patent: 5467205 (1995-11-01), Kuba et al.
patent: 5526184 (1996-06-01), Tokuhashi et al.
Ogasawara Yuji
Tabata Seiichiro
Dang Hung X.
Olympus Optical Co,. Ltd.
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