Optics: image projectors – Composite projected image – Multicolor picture
Patent
1998-07-17
2000-04-18
Dowling, William
Optics: image projectors
Composite projected image
Multicolor picture
353 34, 349 8, G03B 2114
Patent
active
06050689&
ABSTRACT:
Disclosed is a single plate projection type display apparatus which is capable of achieving a high luminance without an increase in an output of a light source. A first lens plate having a plurality of lenses divides a light from a light source into a plurality of light beams. A second lens plate having a plurality of lenses superposes the divided plurality of light beams on a light valve, thereby performing an illumination. A color separation optical system composed of dichroic mirrors which are perpendicular to an XY plane and form predetermined angles to each other, performs a color separation for the light beams from the second lens plate. The light valve modulates R, G and B light beams which are incident thereonto. The modulated lights are projected by a projection lens. The whole shape of the second lens plate is a rectangle. The second lens plate is disposed so that a longitudinal direction of the longer side of the whole shape of the rectangle is perpendicular to a plane formed by a normal line to the dichroic mirrors and an optical axis immediately before an incidence onto the dichroic mirrors.
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Aizawa Hidenori
Nakamura Hiroki
Sekine Atsushi
Watanabe Yoshihiro
Dowling William
Kabushiki Kaisha Toshiba
Nikon Corporation
Sendai Nikon Corporation
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