Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1994-04-26
1997-01-21
Nelms, David C.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359630, 359637, 359638, G02B 2714
Patent
active
055964338
ABSTRACT:
An image display apparatus, for example, a head-mounted image display apparatus, which has a compact magnifying optical system designed so that the horizontal angle of view is as wide as 30.degree. or more, and yet the most off-axis distortion can be reduced to about 5%. The image display apparatus has a display device (D), an optical system (L+R) for projecting the content of information displayed by the display device (D) on an observer's eyeball as a enlarged virtual image without effecting image formation in the optical path, and an optical axis bending device (P) for bending the optical axis of the optical system. The optical axis bending device (P) is a beam splitter prism having a semitransparent surface. The beam splitter prism has an aspherical surface (r.sub.11) constituting a surface thereof which faces the display device (D). The aspherical surface (r.sub.11) is shaped so that the power thereof changes from a relatively positive value to a relatively negative value as the distance from the optical axis of the prism increases toward the periphery thereof.
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patent: 4859030 (1989-08-01), Rotier
patent: 4968117 (1990-11-01), Chern et al.
patent: 4969714 (1990-11-01), Fournier, Jr. et al.
patent: 4969724 (1990-11-01), Ellis
patent: 5278696 (1994-01-01), Suvada
patent: 5303085 (1994-04-01), Rallison
patent: 5309169 (1994-05-01), Lippert
Nelms David C.
Olympus Optical Co,. Ltd.
Tran Andrew Q.
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