Optics: image projectors – Composite projected image – Multicolor picture
Patent
1979-03-08
1980-03-04
Stephan, Steven L.
Optics: image projectors
Composite projected image
Multicolor picture
350156, 350173, 350342, 353 34, 353 37, 358 61, H01J 2989, G03B 2100, G02F 101
Patent
active
041914562
ABSTRACT:
An improved optical block for use in a high brightness, full color image projection system of the type wherein high intensity (acrhomatic) projection light is modulated by a full color image composed of a plurality of monochromatic images applied to a plurality of polarization modulating light valves. A polarizer accepts the achromatic, unpolarized output of a high intensity source. Light of a preferred polarization orientation emergent therefrom is directed by the polarizer to a two level array of polarization-sensitive dichroic filters and wavelength-tuned biprisms. Input level dichroic filters separate the incoming unmodulated light into a plurality of component wavelength bands and direct each to a wavelength-tuned biprism. Each biprism directs the selected bandwidth of polarized light to the reflective surface of a light valve. Light reflected therefrom is altered in polarization in the presence of the chromatic component of the full color image and passes to the second or output level of the optical block. Polarization selective dichroic filters in the output level combine the polarization-modulated chromatic components into a high brightness, full color modulated image and direct the image to projection optics.
REFERENCES:
patent: 3497283 (1970-02-01), Law
patent: 3767290 (1973-10-01), Lang et al.
patent: 4019807 (1977-04-01), Boswell et al.
patent: 4127322 (1978-11-01), Jacobson et al.
Colles Joseph H.
Hong Byung S.
Purdy Stephen J.
Reinsch Stephen J.
Scofield David D.
Hughes Aircraft Company
Kramsky Elliott N.
MacAllister W. H.
Stephan Steven L.
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