PIEZOACTUATOR AND METHOD FOR PRODUCTION OF THE PIEZOACTUATOR

摘要

The invention relates to a piezoactuator (1), comprising at least one stacked piezoelement (2), with at least two electrode layers (7, 8), arranged one over the other along a stacking direction (10) of the piezoelement, at least one piezoelectric layer (4), arranged between two of the electrode layers and at least one pre-tensioning device (15), for introduction of force into a volume of the piezoelectric layer by means of at least one force introduction surface (13, 14) on the piezoelectric layer, which is arranged on at least one of the surface sections (11, 12) facing the pretensioning device. The piezoactuator is characterised in that the force introduction surface is smaller than the surface section of the piezoelectric layer and that the volume is a partial volume (5) of the piezoelectric layer. The production of the piezoactuator is achieved by means of introduction of a force into the partial volume of the piezoelectric layer by means of the force introduction surface on the piezoelectric layer. The force is introduced such that, in the partial volume of the piezoelectric layer, a switching of the polarisation of the domains is generated transverse to the stacking direction. The piezoactuator is characterised by a large relative stroke in the percentage range, whereby forces of several tenths of a Newton per contact surface pair can be transmitted.