Patent ID: 8237333
Filing Date: 2012-08-07
Classification: H01L

Abstract:
1. A piezo actuator comprising first and second external electrodes, a fully active piezo stack which has alternately successive piezoelectric layers and internal electrodes which penetrate as far as the outer side of the piezo stack and each have a first region not comprising carbide formers, such that the coating adheres poorly, or does not adhere, to the first region and a second region comprising carbide formers such that the coating adheres well to the second region, wherein the internal electrodes alternately make contact with the first external electrode and the second external electrode, with their first regions, and a coating which is arranged on the outer side of the piezo stack and to which the external electrodes are applied and which is removed in regions in which the external electrodes make contact with the internal electrodes, with the result that the external electrodes make contact with the first regions of the internal electrodes, and otherwise the coating is arranged between the internal electrodes and the external electrodes.