Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal
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United States of America Patent
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Oct 11, 2005
Grant Date -
Aug 14, 2003
app pub date -
Apr 1, 2002
filing date -
Feb 14, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Moreover, change of the sampling signal is obtained from a difference of the sampling signals by comparing these sampling signals at the first and second points. Comparison of these sampling signals is conducted in unit of drive pulse.
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