Abstract: In a piezoelectric gyroscope system wherein a vibrating body is vibrated in a specific direction by a piezoelectric actuator and is subjected to another vibration in a direction perpendicular to the specific direction due to the Coriolis' force upon being subjected to a rotation of a rotational speed, the perpendicular vibration being detected as an electric signal representative of the rotational speed by a piezoelectric transducer, the vibrating body is made of a circular rod of a piezoelectric material having a plurality of elongated electrodes on the outer surface of the rod, in order to resolve difficulty for mounting piezoelectric transducers onto the vibrating body. A driving signal is applied to predetermined ones of the electrodes to vibrate the rod in a particular diametric direction and an output signal is detected from specific ones of the electrodes according to the vibration due to the Coriolis' force.

Abstract: A piezoelectrically driving device comprises a driving part including paired opposing pole parts substantially square shaped in section, piezoelectric elements provided at least to two adjacent faces of each of the opposing pole parts for causing them to flectionally vibrate resonantly in response to an applied high frequency voltage, and a contact member contactable with one face of each of the opposing pole parts for movement relative thereto or vice versa due to the vibration, any energy loss upon which movement is thereby remarkable restrained and a mechanical driving force can be obtained highly efficiently.