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:
Dec. 18, 2007
Filed:
Feb. 01, 2005
Akio Iwase, Nishio, JP;
Tetsuji Ito, Kariya, JP;
Toshio Ooshima, Oobu, JP;
Shige Kadotani, Chita-gun, JP;
Akio Iwase, Nishio, JP;
Tetsuji Ito, Kariya, JP;
Toshio Ooshima, Oobu, JP;
Shige Kadotani, Chita-gun, JP;
Denso Corporation, Kariya, Aichi-pref., JP;
Abstract
The invention provides a laminate-type piezoelectric element comprising a ceramic laminatewith ceramic layersand internal electrode layersrespectively stacked alternately, and a pair of external electrodes respectively connecting with a pair of connecting areasformed at an outer peripheral area of the ceramic laminate. The internal electrode layer comprises an internal electrode partwith electric conductivity, and a non-pole partwhere the internal electrode partdoes not exist at the inside near an outer peripheral area. The ceramic laminatecomprises stress relaxation partsable to modify more easily their shapes than the ceramic layers, along at least a part of said internal electrode layers. This stress relaxation partis placed so as to overlap with the non-pole partof either of the internal electrode layers, in a stacking direction of the ceramic laminate