Patent ID: 7042143
Filing Date: 2006-05-09
Classification: H01L

Abstract:
1. A piezoceramic multilayer actuator comprising an active region, said active region further comprising inner electrodes led out alternately at a surface of said actuator, wherein, for parallel connection, said inner electrodes of identical polarity of said active region are connected to respective outer electrodes, said outer electrodes being disposed on opposite sides of said actuator; electrode-free piezoelectrically inactive regions further comprising a head region and a foot region; and a transitional region having shrinkage and expansion properties lying between the shrinkage and the expansion properties of said active and inactive regions, said transitional regions interposed between said active region and said respective inactive head and foot regions, wherein in said transitional regions, the electrode-to-electrode spacing between the inner electrodes increases in proximity to said inactive regions and wherein said increase in the spacing of said inner electrodes in said transitional region through said head region or the foot region starts from the spacing of said inner electrodes in said active region and is effected stepwise according to a logarithmic scale.