Transmissive polygonal optical scanning of illumination for ligh

Details Transmissive polygonal optical scanning of illumination for ligh Transmissive polygonal optical scanning of illumination for ligh

1993-05-20

1995-06-27

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 48, 348781, G02F 11335, H04N 5645

Patent

active

054284678

ABSTRACT:
A projection system employs a reflective light valve (10) that is optically addressed by an image from a cathode ray tube (12) and provides an output image for projection by means of a high intensity reading light from a lamp (16) directed to the output face of the liquid crystal light valve. Improved reading illumination is provided by scanning the face of the liquid crystal light valve (10) with a narrow beam of light (80) that moves across the liquid crystal light valve face in synchronism with a scanning image from the writing CRT (12). The scanned narrow band of illumination is provided by refractive transmission through a rotating transparent polygonal body (50,74) having pairs of mutually parallel sides (54,56,58,60,75,76,77a,b), wherein different pairs of sides may be made to transmit light of different colors for color projection. Rotation of the polygonal body is synchronized (82) with the vertical sync (86) of the CRT scan to cause the light beam refracted by the body to synchronously scan the face of the liquid crystal light valve.

REFERENCES:
patent: 4176907 (1979-12-01), Matsumoto et al.
patent: 4246612 (1981-01-01), Berry et al.
patent: 4538181 (1985-08-01), Taylor
patent: 4799164 (1989-01-01), Hellekson et al.
patent: 5192946 (1993-03-01), Thompson et al.
patent: 5216534 (1993-06-01), Boardman et al.
J. H. Waddell, Rotating Prism Design for Continuous Image Compensation Cameras, Jul. 1966, Applied Optics, vol. 5, No. 7, p. 1213.

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