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US 11,531,206 B2Granted
Light source apparatus and projector
AssigneeSeiko Epson Corporation
InventorKoichi Akiyama
Life of this patent
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Abstract
The present disclosure relates to a light source apparatus including a laser light source that outputs a laser beam and a collimator system that parallelizes the laser beam. The collimator system includes three lens groups. A first group includes a first anamorphic lens having negative power in a first direction. A second group includes a second anamorphic lens having positive power in a second direction perpendicular to the first direction. A third group includes a third anamorphic lens having positive power in the first direction.
Claims12
A light source apparatus comprising:
- a laser light source that outputs a laser beam;
- and
- a collimator system that parallelizes the laser beam,
- wherein the collimator system includes three lens groups,
- a first group includes a first anamorphic lens having negative power in a first direction,
- a second group includes a second anamorphic lens having positive power in a second direction perpendicular to the first direction, and
- a third group includes a third anamorphic lens having positive power in the first direction, and
- wherein the first anamorphic lens is formed of a first cylindrical lens,
- the second anamorphic lens is formed of a second cylindrical lens
- the third anamorphic lens is formed of a third cylindrical lens,
- the laser light source has a rectangular light emission area having long sides extending in the first direction and short sides extending in the second direction,
- the second cylindrical lens has a generatrix extending in the first direction, and
- the first and third cylindrical lenses each have a generatrix extending in the second direction.
10 more elements
Dependencies are inferred from the claim text.