Optical disc device and control method of optical disc
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United States of America Patent
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Dec 10, 2013
Grant Date -
Jun 30, 2011
app pub date -
Dec 3, 2010
filing date -
Dec 25, 2009
priority date (Note) -
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Abstract
An optical disc device comprising: a controller for reading data from an optical disc having a plurality of recording layers, wherein: the controller, in shifting a focus of the laser light from a first layer to a second layer, performs a first change that changes a setting on the high frequency signal to a predetermined value at which the high frequency signal is superimposed to suppress peak power of the drive signal if a light density of the second layer is higher than a light density of the first layer; the controller shifts the focus from the first layer to the second layer; and the controller, after the focus has been shifted, performs a second change that changes the setting on the high frequency signal to a predetermined value at which the high frequency signal is superimposed to increase the peak power of the drive signal.
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