Projector
AssigneeSeiko Epson Corporation
InventorKatsumi Tanaka
Life of this patent
Estimating the term…
Abstract
A projector includes an illumination device including a light source that outputs light from a light emitting part, a first lens array having plural first small lenses, a second lens array having plural second small lenses corresponding to the plural first small lenses, and a superimposing lens that superimposes lights from the second lens array, a light modulation device that modulates light from the illumination device in response to image information, and a projection optical system that projects the light from the light modulation device on a projection target, wherein radii of curvature of the first small lenses are set with respect to each first small lens.
Claims5
A projector comprising:
- an illumination device including a light source that outputs light from a light emitting part, a first lens array having plural first small lenses, a second lens array having plural second small lenses corresponding to the plural first small lenses, and a superimposing lens that superimposes lights from the second lens array, the light emitting part being displaceable within a range of distance of from −0.3 mm to 0.3 mm;
- a light modulation device that modulates light from the illumination device in response to image information;
- and
- a projection system that projects the light from the light modulation device on a projection target,
- wherein radii of curvature of the first small lenses are set with respect to each of the first small lenses so as to reduce in-plane light intensity irregularities of light applied to the light modulation device due to displacement of the light emitting part within the range of distance, and to reduce a change of a horizontal illuminance ratio due to displacement of the light emitting part within the range of distance, and the radii of curvature of at least two of the first small lenses are set to be different from each other.
Dependencies are inferred from the claim text.