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:
Oct. 16, 2007
Filed:
Oct. 19, 2005
Kazuo Mochizuki, Akita, JP;
Syuuzi Itoh, Akita, JP;
Hiroshi Hatanaka, Akita, JP;
TDK Corporation, Tokyo, JP;
Abstract
Provided is a multilayer piezoelectric device high in reliability and easy in formation of a unit when incorporated into various devices. In a multilayer piezoelectric device, each second external electrode is integrally formed including a main body part electrically and physically connected to a first external electrode, and an extending part having an upper end projecting with respect to an upper face of laminate in a stack direction. This permits the extending part of the second external electrode to be used as a terminal, and, because the second external electrode is integrally formed, the second external electrode can be prevented from breaking. Therefore, it results in improving the reliability of piezoelectric device. Furthermore, between second external electrodes facing each other, a distance between extending parts is larger than a distance between main body parts, and thus it becomes easy to form a unit of the piezoelectric device when incorporated in various devices; e.g., a plate for application of a preload is placed on the upper face of the laminate.