Vibration control apparatus
June 6, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3520195 Ultrasonic wave generator Sensor device using piezoelectric coating subjected to bending Dither pick-off transducer for ring laser gyroscope Gyroscopes Driving circuit of a vibration wave motor Hydrophone transducer with negative feedback system Vibrator-type level sensor Piezoelectric fan Vibration wave motor InventorAssigneeApplicationNo. 894017 filed on 06/06/1992US Classes:310/316.01, Input circuit for simultaneous electrical and mechanical output from piezoelectric element73/504.12, Vibratory mass73/504.18, With rotary gyroscope310/321Combined with resonant structureExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmForeign Patent References
International ClassH01L 041/08Foreign Application Priority Data1991-06-07 JPAbstractA vibration control apparatus comprises a vibration member having a surface with a resonance point. A piezoelectric element is adhered to the surface of the vibration member. A drive apparatus is connected to the piezoelectric element via an impedance element for exciting the piezoelectric element with an A.C. signal. A feedback circuit is connected between the piezoelectric element and the drive apparatus. The feedback circuit picks out the components of a voltage on the piezoelectric element caused by a strain of the piezoelectric element and feeds this voltage back to control the drive apparatus. The inventive vibration control apparatus may be incorporated in a gyro to simplify the construction of the gyro.Other References
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