The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2013
Filed:
Oct. 20, 2006
Takami Sakamoto, Kirishima, JP;
Masahiro Inagaki, Kirishima, JP;
Harald-johannes Kastl, Fichtelberg, DE;
Carsten Schuh, Baldham, DE;
Bernhard Doellgast, Flurweg, AT;
Atsushi Ochi, Yokohama, JP;
Takami Sakamoto, Kirishima, JP;
Masahiro Inagaki, Kirishima, JP;
Harald-Johannes Kastl, Fichtelberg, DE;
Carsten Schuh, Baldham, DE;
Bernhard Doellgast, Flurweg, AT;
Atsushi Ochi, Yokohama, JP;
Kyocera Corporation, Kyoto, JP;
Continental Automotive GmbH, Hanover, DE;
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.