Piezoelectric actuator unit having a stress relieving layer and method for manufacturing the same

US8410663B2 · kind B2 · utility

Assignees

• KYOCERA Corporation · JP
• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Takami Sakamoto · Kirishima, JP
• Masahiro Inagaki · Kariya, JP
• Harald Kastl · Wolfsberg, AT
• Carsten Schuh · Baldham, DE
• Bernhard Doellgast · Wolfsberg, AT
• Atsushi Ochi · Otsu, JP

Key dates

• Filing date: Oct 20, 2006
• Grant date: Apr 2, 2013
• Expiry date: Feb 23, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/42

Abstract

A piezoelectric actuator unit which undergoes less change in the amount of displacement and shows high durability in continuous operation under a high voltage and a high pressure over a long period of time is provided.The piezoelectric actuator unit including a multi-layer piezoelectric element having piezoelectric layers and metal layers with the piezoelectric layers and the metal layers being stacked one on another, and a case which houses the multi-layer piezoelectric element, wherein at least one of the plurality of metal layers is stress relieving layer which consists of a plurality of partial metal layers that are scattered throughout the entire region between two piezoelectric layers which adjoin the partial metal layers in the direction of stacking, and voids, and a peel-off section is formed at least in a part of the interface between the stress relieving layer and the piezoelectric layer that adjoins therewith.