| 摘要 |
From optimum power set values of Pwp1 and Pwp2 obtained by performing an OPC on Layer 1 and Layer 2 , respectively, an interlayer power ratio alpha=Pwp2/Pwp1 is obtained. In transition from Layer 1 to Layer 2 , the last laser power Pwr1 of Layer 1 adjusted by an R-OPC is multiplied by an interlayer power ratio alpha to set a laser power in transition to Layer 2 , at which recording on Layer 2 starts. In this case, the OPC is not necessarily performed in transition from Layer 1 to Layer 2 , so transition to Layer 2 can be performed quickly. Also, a correction is performed based on the interlayer power ratio alpha, so a power can be set to an appropriate set value in transition to Layer 2.
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