Electro-mechanical energy conversion means and a this electro-mechanical energy conversion means using the vibration shafts drive

摘要

A stack type energy conversion element includes a first electro- mechanical energy conversion element having a plurality of driving electrodes as a first group, all of which are polarized in a first direction, and a second electro-mechanical energy conversion element having a plurality of driving electrodes as a second group, all of which are polarized in a second direction in which an inverse characteristic to that in the first direction is obtained, wherein the first and second energy conversion elements are stacked on each other such that phases of the electrodes of the first group are shifted from those of the electrodes of the second group.