Optical head with adjustable output power detector
AssigneeSharp Kabushiki Kaisha
InventorHiroshi Katayama
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Abstract
An optical head having a semiconductor laser that emits a laser beam, an optical system that leads the laser beam emitted by the semiconductor laser onto a recording medium, an optical power detector that detects the power of the laser beam emitted by the semiconductor laser, and a variable resistor that adjusts the detection output released by the optical power detector. The adjustment performed by the variable resistor enables to suppress readily the fluctuation of the detection output occurring with every optical head manufactured.
Claims4
In a system for optically recording and reproducing information including a power control unit and a separate optical head unit electrically connected to the power control unit and movable with respect to an optical storage medium, the optical head unit comprising:
- a laser for emitting a laser beam;
- an optical system that directs the emitted laser beam onto the optical storage medium;
- an optical power detector that detects the power of the laser beam emitted by the laser and generates a detection output;
- and
- means for adjusting the optical power detector,
- wherein the power control unit controls the optical power of the laser and the means for adjusting included in the optical head unit adjusts the optical power detector independently of the power control unit.
Dependencies are inferred from the claim text.