Optical disk device
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United States of America Patent
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Oct 1, 2013
Grant Date -
Dec 3, 2009
app pub date -
Jun 3, 2009
filing date -
Jun 3, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
There is a need to prevent a possible erroneous detection of an off-track condition during recording to an optical disk. The above need can be addressed by, for example, determining an off-track condition has occurred when a light spot is located at least half-way from the track being recorded toward another track adjacent the track being recorded, and stopping a recording operation. In another example, the above need can be addressed by determining that off-track has occurred based on an output of a first off-track detector which detects that the light spot is off the track based on a wobble signal, an output of a second off-track detector which detects that the light spot is off the track based on a tracking error signal, and an output of a zero-cross detector which detects that the tracking error signal crosses zero based on an output of the tracking error signal.
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