Piezoelectric Actuator having Externally Contacted Inner Electrodes of a Piezoelectric Element

摘要

The invention relates to a piezoelectric actuator having a multi-layered structure of piezo-layers in a piezo element and inner electrodes that are arranged between the piezo-layers. The electrodes are alternatively supplied with an electric voltage of a different polarity in the direction of the layer structure of the piezoelectric element. The alternate lateral contacting of the inner electrodes is achieved via outer electrodes and/or a baked base metallic coating of the lateral surfaces. The respective outer electrodes include a bending coil which is wound from a contactable material. During baking of the base metallic coating the contactable material is applied together with at least parts of the bending coil to the coating in a conductive manner. A flexible sheet metal part that has first been provided with cut sections and/or pre-stamped sections can also be used as an outer electrode.