| 摘要 |
An optimum power set value Pwp 1 for Layer 1 obtained by an OPC is used as an initial value Pw 21 of the OPC for Layer 2 . At this time, an inclination Ia is obtained from an approximation line of a beta value for Layer 1 (recording power to the beta value) obtained by the OPC. From the beta value obtained by performing a test recording at the initial value Pw 21 and the inclination Ia, an approximation line of a beta value for Layer 2 (recording power to the beta value) is obtained. Then, on the obtained approximation line, a laser power for providing a target beta value (betat) is obtained, and set as an optimum power Pwp 2 for Layer 2 . Thus, an optimum power setting conforming to characteristics of a disc can be performed. As a result, setting the optimum power for Layer 2 can be performed more smoothly and quickly.
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