Driving device for oscillatory actuator
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United States of America Patent
Stats
-
Oct 26, 2004
Grant Date -
Jun 5, 2003
app pub date -
Nov 13, 2002
filing date -
Nov 13, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A driving device for an oscillatory actuator in which a FLL (Frequency Locked Loop) is employed for detecting an electromotive force generated in a driving coil resulting from mechanical oscillation during a period in which no driving current is supplied to the oscillatory actuator, and for controlling an oscillation frequency on the basis of a relative time ratio between positive and negative polarities of the electromotive force to thereby pull a driving frequency into a neighborhood of a self-resonance frequency of the oscillatory actuator.
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