Optical disc apparatus
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United States of America Patent
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Oct 15, 2013
Grant Date -
Mar 14, 2013
app pub date -
Aug 3, 2012
filing date -
Sep 9, 2011
priority date (Note) -
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Abstract
An optical disc apparatus includes a focus controller including a first digital filter, tracking controller including a second filter, focus actuator driver, tracking actuator driver, defect detector for detecting a defect on an optical disc, and a system controller for controlling the focus controller, the tracking controller and the defect detector. The system controller holds an input and output of at least one of either the focus controller or the tracking controller on the basis of the output of the defect detector, and sets an initial value in a delay memory of the digital filter of the controller held upon awake of the hold state.
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