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:
Mar. 27, 2012
Filed:
Jun. 22, 2009
Masato Yamazaki, Komaki, JP;
Takayuki Matsuoka, Nishikasugai-gun, JP;
Katsuya Yamagiwa, Komaki, JP;
Takeshi Mitsuoka, Konan, JP;
Masato Yamazaki, Komaki, JP;
Takayuki Matsuoka, Nishikasugai-gun, JP;
Katsuya Yamagiwa, Komaki, JP;
Takeshi Mitsuoka, Konan, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
The present invention provides a piezoelectric ceramic composition having a high thermal resistance and a high piezoelectric distortion constant and a piezoelectric element using the piezoelectric ceramic composition. The piezoelectric ceramic composition of the present invention contains Na, Bi, Ti, Cr and O, wherein the content ratio of Na, Bi, Ti and Cr in terms of oxides thereof falls within the following composition range: aNaO-bBiO-cTiO-dCrOwhere a, b, c and d are mole fractions; 0.030≦a≦0.042; 0.330≦b≦0.370; 0.580≦c≦0.620; 0<d≦0.017; and a+b+c+d=1. The piezoelectric ceramic composition preferably has a main crystal phase of bismuth layer-structured ferroelectric, more preferably NaBiTiOcrystal. The piezoelectric element of the present invention includes a piezoelectric body formed of the piezoelectric ceramic composition and at least a pair of electrodes held in contact with the piezoelectric body.