| 摘要 |
PROBLEM TO BE SOLVED: To prevent plural times of quantum efficiency of a light emitting element obtained before optimum recording power is decided from being dispersed. SOLUTION: Whether or not OPC is to be performed is judged in a step 1, and when to be performed is judged, a test area to test write is gained in the step 2, and a kind of an optical disk and reference power at a one-fold speed write-in time is read, and the reference power: Pref at the OPC time is calculated, and the power sufficiently higher than the reference power: Pref is calculated, and light emission for obtaining the quantum efficiency in a focal state based on the calculated power is performed and the quantum efficiency is obtained, and ACC light is emitted by using the quantum efficiency, and the OPC is performed, and the optimum recording power of the optical disk is obtained.
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