Piezoelectric actuator, e.g. for fuel injection system, has inactive region without internal electrodes, whose mechanical and thermal characteristics correspond to those of active region with piezoelectric layers

摘要

The piezo-actuator has a multilayer structure with internal electrodes (3,4) between layers in a piezoelectrically active region (A). An inactive region (B,C) without internal electrodes is formed from a material whose mechanical and thermal characteristics correspond to the characteristics of the active region (A), including the combination and interaction of the material of the piezo layers (2) and the internal electrodes (3,4).