Invention Grant
US08120999B2 Optical disc apparatus and defocus correcting method 有权
光盘装置和散焦校正方法

Optical disc apparatus and defocus correcting method
Abstract:
An optical disc apparatus in which a bias of a focusing error signal is changed to a value according to a recording power at timing corresponding to a predetermined address position before starting the recording and a defocus of an opposite polarity is preliminarily caused so as to set off a defocus which occurs at the start of the recording.
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