CYLINDRICAL ULTRASONIC MOTOR

PROBLEM TO BE SOLVED: To maintain a cylindrical piezoelectric element make it conductive, and to improve reliability so that the deterioration of the vibration of a centroid rotating oscillator is controlled to a minimum and a stable motor characteristic is obtained for a long time. SOLUTION: A cyli...

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Bibliographische Detailangaben
Hauptverfasser: HONMA KAZUTAKA, DOARA, KATSUBE YASUYUKI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To maintain a cylindrical piezoelectric element make it conductive, and to improve reliability so that the deterioration of the vibration of a centroid rotating oscillator is controlled to a minimum and a stable motor characteristic is obtained for a long time. SOLUTION: A cylindrical ultrasonic motor is mainly constituted of the cylindrical piezoelectric element 14, and the centroid rotating oscillator 10 where a centroid rotates clockwise or anticlockwise with respect to a central axis and a rotor 12 which is press-fitted to the centroid rotating oscillator and rotates by using rotational torque received by friction force are combined. The cylindrical piezoelectric element being a driving source is maintained and an electrode is made conductive by press-fitting the tip of a conductive elastic holding member to the electrode in a center position of the outer peripheral face axial direction of the cylindrical piezoelectric element by using a conductive elastic holding member 20 in which a metal material and a polymeric material are combined and which performs maintenance and conduction. COPYRIGHT: (C)2008,JPO&INPIT