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:
Feb. 19, 2013
Filed:
Oct. 26, 2006
Shigenobu Nakamura, Kirishima, JP;
Susumu Ono, Kirishima, JP;
Takeshi Kato, Kirishima, JP;
Koichi Nagasaki, Kirishima, JP;
Shigenobu Nakamura, Kirishima, JP;
Susumu Ono, Kirishima, JP;
Takeshi Kato, Kirishima, JP;
Koichi Nagasaki, Kirishima, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A multi-layer piezoelectric element of high durability wherein external electrodes do not peel off the surface of a stack even when operated continuously over a long period of time under a high electric field and a high pressure, a method for manufacturing the same and an injection apparatus using the same are provided. The multi-layer piezoelectric element comprises a stackconsisting of a plurality of piezoelectric layersand a plurality of metal layerswhich are stacked alternately one on another and external electrodes (covering member)that cover at least a part of the side faces of the stack, wherein at least one metal layeramong the plurality of metal layersis a porous metal layerwhich has more voids than the metal layersthat adjoin the metal layeron both sides thereof in the stacking direction, and a part of the external electrodesinfiltrates between two piezoelectric layerswhich adjoin the porous metal layerin the stacking direction.