| 摘要 |
A multi-layer piezoelectric element having high durability of which amount of displacement is suppressed from varying even when operated continuously over a long period of time with a higher electric field under a high pressure is provided.
The multi-layer piezoelectric element comprising a multi-layer structure in which a plurality of piezoelectric material layers and a plurality of metal layers are stacked alternately one on another, wherein the plurality of metal layers comprises internal electrodes and low-rigidity metal layer that has rigidity lower than those of the piezoelectric material layer and the internal electrode,
wherein the low-rigidity metal layer comprises a plurality of metal parts that are separated from each other, and wherein at least one of the metal parts is bonded with only one piezoelectric material layer among the two piezoelectric material layers that adjoin in the stacking direction. |
