Patent ID: 6121717
Filing Date: 2000-09-19
Classification: B26B,H01L,H02N

Abstract:
A driving device for at least two rotation elements, which device comprises at least one piezoelectric driving element, characterized in that the piezoelectric driving element comprises a dual mode piezoelectric resonator and at least two friction elements which are arranged on the piezoelectric resonator and are disposed opposite one another, the piezoelectric resonator with the friction elements is arranged between the two rotation elements and is restrained by means of a pre-loading force, each one of the friction elements acts upon one of the rotation elements, and electrical means for the excitation of a vibration mode of the piezoelectric resonator have been provided wherein the pre-loading force, the geometry of the piezoelectric resonator and the friction coefficients between the friction elements and the rotation elements are dimensioned so that the two friction elements perform a substantially elliptical rotary movement, and the longitudinal axis of symmetry of the ellipse is inclined with respect to the connecting line between the two rotation elements.