Patent ID: 6657361
Filing Date: 2003-12-02
Classification: B26B,G11B,H01L,H02N

Abstract:
A piezoelectric drive device comprising a bimodal piezoelectric resonator (1) and means for supplying control signals (S),wherein said resonator (1) comprises: at least a first control electrode (2) for triggering the resonator (1) in a first drive direction, and at least an other control electrode (4) for triggering the resonator in a second drive direction, and said means for supplying control signals comprises a trigger circuit (6) for supplying control signals (S) to the first and the other control electrode, characterized in that the device further comprises a regulating circuit (7) for regulating the control signals (S), first means for supplying a feedback signal (k) from the other control electrode (4) to the regulating circuit (7) when the resonator is not being triggered by said other control electrode and the resonator (1) is being triggered in the first drive direction by means of the first control electrode (2), and second means for supplying a feedback signal (k) from the first control electrode (2) to the regulating circuit (7) when the resonator is not being triggered by said first control electrode and the resonator (1) is being triggered in the second drive direction by means of the other control electrode (4).