Disk-rotation control apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 18, 2001
Issued Date -
N/A
app pub date -
Mar 9, 2000
filing date -
Apr 14, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a device for controlling rotation of a disk, if a determination is made that a signal is not normally detected by a pre-pit-region detection circuit, an error signal is obtained from a pulse generator to control the rotation of the disk. If a determination is made that a signal is normally detected by the pre-pit-region detection circuit and if the synchronizing signals are not normally detected at predetermined intervals, an error signal is obtained from the wobble signal so that the rotations of the disk are controlled. If a determination is made that synchronizing signals are detected by the pre-pit-region detection circuit at predetermined intervals, an error signal is obtained from clocks synchronized with the reproduced signal generated by the PLL circuit so that rotations of the disk are controlled.
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