Piezoelectric bimorph element

Abstract

Abstract PURPOSE:To obtain the bimorph of a small depolarization of polarization by laminating a plurality of piezoelectric elements to which voltage is applied in the direction reverse to the direction of a polarization axis and piezoelectric elements to which voltage is applied in the direction of polarization and making the values of coercive electric fields of the elements, to which voltage is applied in the reverse direction, higher than those of the elements to which voltage is applied in the forward direction. CONSTITUTION:The piezoelectric element 1 to which voltage is applied in the direction of the polarization axis and the piezoelectric element 2 with higher breakdown electric field to which voltage is applied in the direction reverse to the direction of the polarization axis are pasted together by using adhesives 4, 4' consisting of an epoxy group resin, etc. while holding an intermediate electrode plate 6. The element 3 of the same characteristics as the element 2 is pasted together on the element 2 side by using rubber group adhesives 5, and followed to mechanical deformation among these elements. Negative potential is applied to the intermediate electrode plate 6 constituted in this manner and positive potential to the element 3, the element 1 is shrunk, and the elements 2 and 3 are extended. Accordingly, the bimorph element of small quantity of displacement and degradation is obtained even under the state in which voltage is applied for a long time in a high-temperature atmosphere at a Curie temperature or less.

Inventors

• 👤 Masatoshi Oba
• 👤 正利 大場
• 👤 Ryuichi Sato
• 👤 隆一 佐藤
• 👤 Tsutomu Taniguchi
• 👤 勉 谷口
• 👤 Yutaka Nozaki
• 👤 豊 野崎

Bibliographic Details