Patent ID: 7342862

Claim:
An optical disc system, comprising: a disc recording unit configured to record an information signal on an optical disc by switching an irradiation power of a laser light to be applied to the optical disc in accordance with the information signal, the disc recording unit including a semiconductor laser configured to serve as a light source of the laser light; a laser-power controlling circuit configured to output a laser-driving-current instruction signal such that the semiconductor laser emits a predetermined light power; a recording-pulse generating circuit configured to generate an appropriate recording pulse in accordance with the information signal to output a laser-modulation timing pulse; a laser driving circuit configured to generate a laser driving current in accordance with the laser-driving-current instruction signal and the laser-modulation timing pulse; and a correction-data storage configured to store, as correction data, a shift between the laser-modulation timing pulse in the laser driving circuit and a pulse position of the laser driving current; and a controller configured to correct the pulse position of the laser driving current to a desired position by correcting a position of the laser-modulation timing pulse with reference to the correction data stored in the correction-data storage.