Optics: image projectors – Composite projected image – Multicolor picture
Patent
1997-01-27
1998-10-13
Dowling, William
Optics: image projectors
Composite projected image
Multicolor picture
353 69, 353 34, 359634, G03B 2114
Patent
active
058202412
ABSTRACT:
An optical device for combining three sub-beams of different colors to one color beam is disclosed having a first and a second color-selective reflector arranged on transparent plate-shaped substrates, the first reflector reflecting a first of said sub-beams, the second reflector reflecting the first sub-beam and a second of said sub-beams and a third of said sub-beams passing through the second reflector and its substrate. A transparent plate is arranged in the path of the first sub-beam and in front of the first reflector, the transparent plate having a product of refractive index and thickness equal to that of the substrates of the first and second reflectors. An astigmatism correcting element is positioned in the path of the color beam.
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patent: 4969730 (1990-11-01), Van Den Brandt
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patent: 5200857 (1993-04-01), Matsushita
patent: 5231431 (1993-07-01), Yano et al.
"New Liquid Crystal Polarized Color Projection Principle", Schadt et al, Japanese Jornal of Applied Physics, vol. 29, No. 10, Oct., 1990, pp. 1974-1984.
Dowling William
Faller F. Brice
U.S. Philips Corporation
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