Back to results
US 6,634,755 B1Granted
Illuminating device and projector
AssigneeCanon Kabushiki Kaisha
InventorsAtsushi Okuyama, Saburo Sugawara, Hiroyuki Kodama
Life of this patent
Estimating the term…
Abstract
In an illuminating device in which a light from a light source is separated into three color lights differing in optical path from one another by a color separating system, and light modulating elements conforming to the respective color lights are illuminated with the color lights, at least one of the optical paths of the three color lights has therein a reflecting system having positive power for reflecting the color light passing therethrough.
Claims23
An illuminating device, comprising:
- a color separating system for separating light from a light source into three color lights having different optical paths one another;
- and
- an optical system for illuminating three modulating elements respectively corresponding to said three color lights by said three color lights,
- wherein when assuming the three optical paths along which said three color lights travel as a first optical path, a second optical path and a third optical path respectively, said first optical path is longer than said second optical path and third optical path, and two concave mirrors are provided only in said first optical path.
1 more element
An illuminating device comprising:
- a color separating system for separating light from a light source into three color lights;
- and
- an optical system for illuminating three modulating elements respectively corresponding to said three color lights by said three color lights, wherein a plurality of mirrors are located between said color separating system and said modulating element both on at least one of optical paths of said three color lights, and at least one of said plurality of mirrors is a convex mirror.
An illuminating device comprising:
- a color separating system for separating light from a light source into three color lights;
- and
- an optical system for illuminating three modulating elements respectively corresponding to said three color lights by said three color lights,
- wherein when said three optical paths of said three color lights are respectively defined as a first optical path, a second optical path, and a third optical path, said first optical path is longer than said second and third optical paths, a plurality of mirrors are located between said color separating system and said modulating element on said first optical path, and at least one of said plurality of mirrors is a concave mirror.
1 more element
An illuminating device comprising:
- a color separating system for separating light from a light source into three color lights;
- and
- an optical system for illuminating three modulating elements respectively corresponding to said three color lights by said three color lights,
- wherein a plurality of mirrors are located between said color separating system and said modulating element both on at least one of optical paths of said three color lights, and at least one of said plurality of mirrors is a concave mirror.
1 more element
Dependencies are inferred from the claim text.