Focus controlling method and optical disk drive using the focus controlling method
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United States of America Patent
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Nov 3, 2015
Grant Date -
Mar 12, 2009
app pub date -
Aug 29, 2008
filing date -
Sep 10, 2007
priority date (Note) -
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Abstract
An apparatus and method control a disk drive servo, and more particularly, an apparatus and method control a servo when moving between layers of a disk in a multi-layered disk drive. A focus controlling method, as an example of the servo controlling method, includes the operations of performing aberration correction according to a change of a recording layer of a disk from a currently accessed recording layer to a recording layer desired to be accessed, and changing the value of a parameter set that determines characteristics of signals for use in servo control of an optical disk drive, according to an aberration correction amount that is used during the aberration correction.
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