| 摘要 |
According to one embodiment, a control method, includes moving a pickup head to an adjustment position adjusting the quantity of adjustment of focus balance measuring the amplitude of an RF signal in the adjustment position adjusting the focus balance adjustment quantity and measuring the RG signal amplitude a plurality of times estimating the focus balance adjustment quantity at which the RF signal amplitude is maximized from the measured focus balance adjustment quantities and RF signal amplitude moving the pickup head to a different adjustment position estimating the focus balance adjustment quantity at which the RF signal amplitude is maximized in the different adjustment position by adjusting the focus balance adjustment quantity and measuring the RF signal amplitude a plurality of times and adjusting the focus balance adjustment quantity to the focus balance adjustment quantity estimated in the different adjustment position.
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