Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1996-10-16
1998-10-06
Font, Frank G.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359831, 359833, 359837, 359630, 359631, 359634, G02B 2714, G02B 504
Patent
active
058186417
ABSTRACT:
An image display apparatus which enables observation of a clear image at a wide field angle and which is extremely small in size and light in weight. The apparatus includes an image display device (6) for displaying an image, and an ocular optical system (7) for leading the image displayed by the image display device (6) to an observer's eyeball (1). The ocular optical system (7) has a first surface 3, a second surface 4, and a third surface 5. A space formed by the three surfaces is filled with a transparent medium having a refractive index larger than 1. Light rays emitted from the image display device (6) pass through the third surface (5) and are internally reflected by the first surface (3) and further internally reflected by the second surface (4), which is decentered and has positive power. The reflected light rays pass through the first surface (3) and are led to the observer's eyeball (1). The angle .theta..sub.2 formed between an axial principal ray after being reflected by the second surface (4) and a line normal to the second surface (4) at a point thereon where the axial principal ray is reflected satisfies the condition of 10.degree..ltoreq..theta..sub.2 .ltoreq.40.degree..
REFERENCES:
patent: 5093567 (1992-03-01), Staveley
patent: 5506728 (1996-04-01), Edwards et al.
patent: 5539578 (1996-07-01), Togino et al.
patent: 5546227 (1996-08-01), Yasugaki et al.
patent: 5596433 (1997-01-01), Konuma
Font Frank G.
Olympus Optical Co,. Ltd.
Stafira Michael P.
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