Patent ID: 7990023

Claim:
A piezoelectric actuator comprising: at least one piezoelectric element having a multilayer construction of piezoelectric layers; an actuator head disposed on an end of the at least one piezoelectric element; an actuator foot disposed on an other end of at least one piezoelectric element; a cover layer system including at least one ply of the insulation material disposed around the at least one piezoelectric element, or multiple piezoelectric elements located in series in an actuation direction, the at least one ply disposed at least partially around the actuator head and the actuator foot, and the at least one ply sealingly surrounding joining points between the piezoelectric element or piezoelectric elements and the actuator head and the actuator foot, wherein the cover layer system is a multi-ply cover layer system, a plurality of plies are present only in part, and there is at least one ply of the insulation material at each point on the surface of the piezoelectric element or piezoelectric elements and at least partially around the actuator head and the actuator foot, and wherein in the multi-ply cover layer system, at least a ply on a surface of the piezoelectric element or the piezoelectric elements does not adhere, so that a relative motion of the ply relative to the surface of the respective piezoelectric element, and/or of plies to one another, can be executed.