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US 6,637,892 B1Granted
Projection apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAtsushi Okuyama, Hiroyuki Kodama
Life of this patent
Estimating the term…
Abstract
In a projection apparatus, an optical integrator is illuminated with light from a light source, one or more image display elements is irradiated with a plurality of beams from the integrator, and image light from the image display element or elements is projected by a projection optical system. The illuminating range of some of the plurality of beams is made smaller than the illuminating range of the other beams.
Claims20
A projecting apparatus comprising:
- an optical integrator including a lens array for receiving light from a light source, for dividing light received by said lens array into a plurality of light beams;
- at least one or more display elements;
- an irradiation optical system for irradiating said at least one or more display elements with said plurality of light beams;
- and
- a projection optical system for projecting light from said at least one or more display elements onto a projected plane,
- wherein said lens array of said optical integrator includes at least a first group comprising a plurality of lenses and a second group comprising a plurality of lenses, and an area irradiated by a light beam emerged from one of said plurality of lenses comprised in said first group is smaller than that irradiated by a light beam emerged from one of said plurality of lenses comprised in said second group.
3 more elements
A projection apparatus comprising:
- an optical integrator illuminated with light from a light source, for dividing light from said light source into a plurality of light beams;
- at least one or more display elements irradiated with said plurality of light beams;
- an irradiation optical system for irradiating said at least one or more display elements with said plurality of light beams;
- and
- a projection optical system for projecting light from said at least one or more display elements onto a projected plane,
- wherein said integrator has plural lens arrays and among said plural lens array, a lens array positioned at light source side includes a plurality of lenses of which focal distance are different from each others.
3 more elements
Dependencies are inferred from the claim text.