MULTILAYER PIEZOELECTRIC DEVICE STRUCTURE AND MULTILAYER PIEZOELECTRIC DEVICE STRUCTURE COMPRISING MAGNETOSTRICTIVE MATERIAL

摘要

The present invention relates to a multilayer piezoelectric device structure. The present invention also relates to such a multilayer piezoelectric device structure including a magnetostrictive material. A piezoelectric device of the present invention can be used in various fields such as a speaker, an actuator, a sensor, and an energy harvester. The multilayer piezoelectric device structure according to an embodiment of the present invention comprises: at least two piezoelectric material sheets stacked on top of one another; and electrode patterns disposed on the top and bottom surfaces of the piezoelectric material sheets, wherein the electrode patterns include a first electrode pattern and a second electrode pattern, the first electrode pattern and the second electrode pattern are electrically insulated, each of the first and second electrode patterns includes a plurality of electrodes forming an interdigitated electrode pattern, and the electrode patterns are arranged to be projected in the same shape in a vertical direction.