Illumination device and projection video display device
AssigneeSanyo Electric Co., Ltd.
InventorsMakoto MAEDA, Ken MASHITANI, Kazuhiro ARAI, Hideyuki KANAYAMA, Takashi IKEDA, Takaaki ABE
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Abstract
An illumination device includes a first light source unit having a plurality of first light sources, and a first reflection unit for guiding light beams emitted respectively from the first light sources in an identical direction. The illumination device further includes a second light source unit having at least one second light source. A center of an optical axis of the second light source is defined in an area where a light amount distribution of light beams to be emitted from the first light source unit and reflected on the first reflection unit is relatively small.
Claims10
An illumination device, comprising:
- a first light source unit including a plurality of first light sources;
- a first reflection unit for guiding light beams emitted respectively from the first light sources in an identical direction;
- and
- a second light source unit including at least one second light source, wherein
- assuming a plane perpendicular to a propagating direction of the light beams emitted from the first light source unit and reflected on the first reflection unit, a center of an optical axis of the second light source is defined in an area, on the plane, where a light amount distribution of the light beams from the first light sources is relatively small, the area being surrounded by centers of optical axes of the first light sources.
An illumination device, comprising:
- four first light sources;
- a reflection unit including four mirror surfaces for guiding light beams emitted respectively from the four first light sources in an identical direction, each of the four mirror surfaces being arranged at such a position that a center of an optical axis of the corresponding first light source is aligned with a position of a vertex of a predetermined rectangle, assuming that the rectangle is defined on a plane perpendicular to a propagating direction of the light beams emitted from the first light sources and reflected on the respective corresponding mirror surfaces;
- and
- a second light source, wherein
- a center of an optical axis of the second light source is aligned with a center position of the rectangle.
A projection video display device, comprising:
- an illumination device for emitting light beams;
- and
- a light modulation unit for modulating the light beams in accordance with an input video signal to generate modulated image light beams,
- the illumination device including:
- a first light source unit having a plurality of first light sources;
- a first reflection unit for guiding light beams emitted respectively from the first light sources in an identical direction;
- and
- a second light source unit having at least one second light source, wherein
- assuming a plane perpendicular to a propagating direction of the light beams emitted from the first light source unit and reflected on the first reflection unit, a center of an optical axis of the second light source is defined in an area, on the plane, where a light amount distribution of the light beams from the first light sources is relatively small, the area being surrounded by centers of optical axes of the first light sources.
Dependencies are inferred from the claim text.