Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1994-03-18
1996-09-03
Nguyen, Viet Q.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359630, 359631, G02B 2714
Patent
active
055529348
ABSTRACT:
An improved plano-beam splitter for use in a real image projecting system is described. The treated planar expanse interposes a concave mirror positioned within an enclosure and an aperture provided in one wall of the enclosure acts to reflect the image of an illuminated object within the enclosure but out of sight of the aperture onto the concave mirror and to pass the image of the object reflected from the mirror toward the aperture and out of the enclosure to form a projected real image of the object in a space a determined distance in front of the aperture. The expanse is treated relatively to absorb or reflect light incident on it from the aperture, while relatively passing light incident on it from the mirror, thereby directionally differentially to provide clarity in a projected image uncluttered by reflected light entering the enclosure. Treating may be by tinting, coating, or other techniques, and may act to cause the expanse relatively to absorb and/or reflect light incident upon its front, or aperture-facing, surface.
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Le Vu A.
Nguyen Viet Q.
SPM Corporation
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