Ultrasonic motor with vibration suppressor
Patent 4980597 Issued on December 25, 1990. Estimated Expiration Date: 
April 24, 2010. 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.
April 24, 2010. 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 ReferencesLength mode piezoelectric ultrasonic transducer for inspection of solid objects Electromechanical transducer-coupled mechanical structure with negative capacitance compensation circuit Vibration wave motor Patent #: 4513219 InventorAssigneeApplicationNo. 513962 filed on 04/24/1990US Classes:310/319, Electrical output circuit310/316.01, Input circuit for simultaneous electrical and mechanical output from piezoelectric element310/316.02, Traveling wave motor310/326Combined with damping structureExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmForeign Patent References
International ClassH01L 041/08Foreign Application Priority Data1989-06-27 JPAbstractAn ultrasonic motor includes a retaining member which retains an ultrasonic vibrator. An electromechanical transducing element such as a piezoelectric element is attached on the retaining member. An impedance element is electrically connected with the electromechanical transducing element to form a closed circuit, and the antiresonance frequency of a parallel circuit formed of the reactance component of the electromechanical transducing element and the impedance element is substantially the same as the frequency of the ultrasonic vibration of the ultrasonic vibrator. This structure suppresses undesirable vibration in the retaining member and thus also avoids the undesirable propagation of vibration to external equipment. | |
