| 摘要 |
In accordance with a length of a pit to be recorded, a laser power irradiation time is controlled to have a length of (n-K)T +Delta3T, where nT represents the length of a pit to be formed, K is a constant and Delta3T represents an extra laser power value for addition to recording of a 3T pit. The control section also performs control for imparting an additional top power pulse to an initial part of each pit-forming laser power irradiation so as to increase a level of the laser power over a standard recording power level temporarily for a predetermined time period during the irradiation. The K and Delta3T values and the level of the additional top power pulse are optimized for each selected recording speed. This arrangement always achieves optimum reproductive characteristics of signals recorded on cyanine-based or phthalocyanine-based optical disks at any selected recording speeds.
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