| 摘要 |
A recording pulse for driving a laser is formed so that a length of a recorded mark on a recording medium corresponds to a recording code length of data; the recording pulse is formed as a recording pulse train having pulse heights corresponding to a plurality of power levels including a recording power and an erasure power; the recording pulse train is composed of a plurality of pulses including a multi-pulse and a trailing pulse; and the recording medium at a plurality kinds of linear velocities is irradiated with laser light based on the recording pulse to form the mark. When linear velocities v1 and v2 are in a relationship that v1<v2, the following formulas are satisfied: (TL1/Tw1)<(TL2/Tw2), and ((TM2/Tw2)/(TM1/Tw1))<((TL2/Tw2)/(TL1/Tw1)), where Tw1, Tw2: channel dock periods at the linear velocities v1, v2, TL1, TL2: trailing pulse widths at the linear velocities v1, v2, TM1, TM2: multi-pulse widths at the linear velocities v1, v2.
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