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:
Aug. 12, 2008
Filed:
Dec. 05, 2005
Akio Iwase, Nishio, JP;
Shige Kadotani, Chita-gun, JP;
Tetsuji Itou, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
A hollow laminated piezoelectric element having excellent durability and reliability and capable of obtaining a high output, and a method of manufacturing the hollow laminated piezoelectric element are provided. A hollow laminated piezoelectric elementcomprises a ceramic laminatethat is formed by having alternately laminated piezoelectric layersmade of a piezoelectric material and internal electrode layersandhaving conductivity and by having a center through holeformed to pass through the ceramic laminatealong a lamination direction. The ceramic laminatehas an internally terminated structure in the inside periphery having at least a portion of inside peripheral ends of the internal electrode layersandterminated within the ceramic laminateso that at least a portion of the inside peripheral ends of the internal electrode layersandis not exposed to the inside peripheral surfaceof the ceramic laminate. The inside peripheral surfaceof the ceramic laminatehas inside peripheral slitshaving trenches provided in the peripheral direction toward the inside of the piezoelectric layersfrom the inside peripheral surface