Semiconductor laser chip and optical pickup using the same
AssigneeSharp Kabushiki Kaisha
InventorAkira Ariyoshi
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Abstract
A semiconductor laser chip has an emission point on a PN junction thereof. The emission point is located at a distance of 80 μm or less along the PN junction from a lateral side surface of the semiconductor laser chip.
Claims9
A semiconductor laser chip having an emission point on a PN junction thereof, wherein said emission point is located at a distance of 80 μm or less along the PN junction from a lateral side surface of the semiconductor laser chip.
A semiconductor laser device for use as a light source of an optical pickup detecting a track signal by a method using sub-beams, said semiconductor laser device comprising a semiconductor laser chip having an emission point that is located at a distance of 80 μm or less from a lateral side surface of the semiconductor laser chip.
An optical pickup comprising:
- a mirror which diverts a light path toward an information-recording surface of an optical disk placed in position;
- and
- a grating which generates one or more sub-beams, said grating being disposed in such a way that an angle e of 5°-90° is formed between said information-recording surface and a direction in which said grating is oriented.
Dependencies are inferred from the claim text.