STACKED PIEZOELECTRIC ELEMENT, AND JET DEVICE AND FUEL JET SYSTEM EQUIPPED WITH THE SAME

摘要

Provided is a stacked piezoelectric element in which change in displacement is suppressed even when being continuously driven for a long time under a high electric field and a high pressure and an excellent endurance is obtained. The stacked piezoelectric element has a stacked structure in which a plurality of piezoelectric layers and a plurality of metal layers are alternately stacked. The piezoelectric layers comprise a plurality of piezoelectric crystal grains. The metal layers include an internal electrode and a low-rigidity metal layer having a low rigidity in comparison with the piezoelectric layers and the internal electrode. The low stiffness metal layer has a plurality of mutually isolated metal portions and the ends of the metal portions are interposed between the piezoelectric crystal grains.