| 摘要 |
Light source driving units and optical storage apparatus are disclosed which drive a light source(s) at multiple levels for one-beam overwrite or for controlling the shape of a recording mark. These comprise various means to suppress error due to waveform distortions and skew (the difference in delays of the multiple light modulation control signals) caused by signal lines in the flexible printed circuit when carrying out high-speed and high-density recording. Also disclosed are light source driving units and optical storage apparatus comprising state control sections(s) controlling states corresponding to multiple irradiating levels based on a modulating signal, a state transition signal and a preset transition rule. The modulating data generated in used to modulate the driving current supplied to the light source. The transition rule(s) may be modified. Complex light modulating waveforms may be set according to the kind and recording linear velocity of the information recording medium. <IMAGE>
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