Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1993-07-26
1995-07-25
Ben, Loha
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359434, 359630, G02B 2714
Patent
active
054367654
ABSTRACT:
A head- or face-mounted display apparatus which enables observation at a field angle of 40.degree. or more and provides an image which is flat and clear as far as the peripheries thereof. The display apparatus has a two-dimensional image display element (1), a relay optical system (2 and 3) for projecting a two-dimensional image displayed by the two-dimensional image display element (1), and a concaves mirror (4) disposed forwardly of an observer's eyeball (5) to project the two-dimensional image in the air as an enlarged image and to lead the projected image to the observer's eyeball (5). The relay optical system includes a first lens unit (2) including at least one positive lens and having positive or negative refracting power, and a second lens unit (3) including at least one negative lens and having negative refracting power. The relay optical system is decentered so that the front focal surface (8) of the concave mirror (4) coincides with the image surface (7) of the relay optical system.
REFERENCES:
patent: 4026641 (1977-05-01), Bosserman et al.
patent: 4218111 (1980-08-01), Withrington et al.
patent: 4669810 (1987-06-01), Wood
patent: 4729634 (1988-03-01), Raber
patent: 4997263 (1991-03-01), Cohen et al.
Yano, Sunio: "Psychological Effects of Visual Angle for Stereoscopic Images", vol. 45, No. 12 (1991) pp. 1589-1596.
Ben Loha
Nguyen Thong
Olympus Optical Co,. Ltd.
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