| 摘要 |
In performing the balance regulation of focus error signal, the balance of the focus error signal is changed in a predetermined range. Then, the level of the RF signal is measured while continuously changing the balance of the focus error signal and the balance of the focus error signal is changed in a predetermined range when the RF signal level becomes maximum. Then, jitter is measured while changing the focus error signal level. An intermediate balance regulation value between the balance regulation value of the focus error signal when the RF signal level is maximum and the balance regulation value of the focus error signal when the jitter is minimum is calculated. The focus balance regulation is performed by the calculated intermediate balance regulation value.
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