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US 5,631,687 AGranted
Laser light radiation device providing reduced laser light spot size
AssigneeCanon Kabushiki Kaisha
InventorMamoru Tanaka
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Abstract
A laser light radiation device has a light source for emitting laser light which is modulated according to an image signal, a collimator lens for collimating the laser light emitted from the light source, and a polygonal mirror for deflecting the laser beam emerging from the collimator lens. The device further has a diffraction grating in a laser optical path between the collimator lens and the polygonal mirror.
Claims9
A laser light radiation device comprising:
- a light source for emitting laser light which is modulated according to an image signal;
- a collimator lens for collimating the laser light emitted from said light source;
- and
- deflection means for deflecting laser light emerging from said collimator lens,
- wherein said device further comprises a diffraction grating in a laser optical path between said collimator lens and said deflection means, said diffraction grating reducing spot size of said laser light emerging from said collimator lens.
2 more elements
Dependencies are inferred from the claim text.