Optical waveguides – Optical imaging tunnel
Patent
1991-09-17
1994-06-14
Bovernick, Rodney B.
Optical waveguides
Optical imaging tunnel
385115, 385120, 385 60, G02B 612
Patent
active
053217896
ABSTRACT:
A light valve is a planar member in which liquid crystals are hermetically sealed, and allows the transmission of light in an almost parallel direction and selectively scattering undesired light. On a rear surface of the light valve is disposed a light guide tube which contains a plurality of minute apertures. Alternatively, one of the substrates which constitute the light valve may be made of a fiber plate. The fiber plate has a structure in which short optical fibers are stacked. The light guide tube or the fiber plate converges a luminous flux emitted from the light valve to improve the contrast of an image. A projection display apparatus is constituted of a light source, a light valve, either a light guide tube or a fiber plate, a lens, and a projection lens. A luminous flux emitted from either the light guide tube or the fiber plate is incident on the pupil of the projection lens by way of the lens, and the projection lens casts this luminous flux onto a screen, thus forming a projected image. The selectively scattered undesired light cannot pass through the light guide tube or file plate.
REFERENCES:
patent: 3543384 (1970-12-01), Hansen
patent: 3703660 (1972-11-01), Fyler
patent: 4112170 (1978-09-01), Rauscher
patent: 4486760 (1984-12-01), Funada et al.
patent: 4874227 (1989-10-01), Matsukawa et al.
"A Full-Color Projection TV Using LC/Polymer Composite Light Valves" SID Jun. 1990 Digest.
Kida Hiroshi
Kondo Mitsushige
Shikama Shinsuke
Toide Eiichi
Usui Masahiro
Barns Stephen W.
Bovernick Rodney B.
Mitsubishi Denki & Kabushiki Kaisha
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