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:
Jun. 14, 2011
Filed:
Oct. 27, 2006
Shuichi Fukuoka, Kagoshima, JP;
Tomonori Eguchi, Kagoshima, JP;
Hitoshi Nakakubo, Kagoshima, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A piezoelectric ceramic composition including potassium-sodium-lithium niobate, bismuth-sodium titanate and bismuth ferrate is provided. A piezoelectric ceramic obtained by firing the piezoelectric ceramic composition, wherein the electromechanical coupling factor is high, the piezoelectric gconstant, in particular, is large, the second phase transformation does not exist in the temperature range of −40 to 150° C. in at least one of a temperature-dependent variation of a resonance frequency, a temperature-dependent variation of an anti-resonance frequency and a temperature-dependent variation of piezoelectric gconstant, and a good heat-resistant property is obtained, is provided.