Vibratory driving device
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United States of America Patent
Stats
-
Nov 5, 2013
Grant Date -
Nov 25, 2010
app pub date -
May 18, 2010
filing date -
May 20, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vibratory driving device includes a shaft-like driving member, an electromechanical transducer which can incline the driving member and which also can displace the driving member in the axial direction of the driving member, a movable member which slidably engages on the driving member, a driving circuit which can apply to the electromechanical transducer a frictional driving voltage displacing the driving member back and forth with a speed varying asymmetrically in the axial direction to slidingly displace the movable member with respect to the driving member and a periodic inclination driving voltage oscillating the driving member, a resonance frequency meter which measures a resonance frequency of the inclining oscillation of the driving member, and a position estimator which estimates a position of the movable member based on the resonance frequency.
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