Patent ID: 7075212

Claim:
A piezoelectric drive ( 1 ) with an inner part ( 2 ) that is surrounded by an outer part ( 3 ) having an inwardly directed drive surface ( 4 ), wherein the inner part ( 2 ) comprises at least one piezoelement ( 9 ) that is actively connected to at least one oscillation element ( 5 ) and serves for exciting an oscillation ( 17 ), wherein the oscillation element ( 5 ) comprises a two-dimensional middle part ( 6 ), said middle part ( 6 ) being arranged essentially symmetrical to the drive ( 1 ) and being actively connected to the drive surface ( 4 ) via at least two symmetrically arranged interaction regions ( 16 ), said interaction regions ( 16 ) being designed to be set into oscillation by way of the at least one piezoelement ( 9 ) and drive the outer part ( 3 ) relative to the inner part ( 2 ), wherein at least two arms ( 7 , 15 ) are arranged about the middle part ( 6 ) and are actively connected to the drive surface ( 4 ) via in each cases one of the interaction regions ( 16 ), the arms ( 15 ) act as spring elements and are preloaded with respect to the drive surface ( 4 ) by way of a spring effect provided thereby.