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. 28, 2001
Filed:
Apr. 06, 2000
Tomoyuki Ogawa, Shiga-ken, JP;
Katsuhiro Horikawa, Shiga-ken, JP;
Abstract
A piezoelectric buzzer formed by using a piezoelectric ceramic having both a higher heat resistance and a higher piezoelectric characteristics than those of a conventional product. The piezoelectric buzzer,of the present invention has a metal plate,Formed on the metal plate,is a piezoelectric ceramic,Further, formed on the piezoelectric ceramic,is an electrode,The piezoelectric composition forming the piezoelectric ceramic is a piezoelectric ceramic composition characterized in that about 0.2 to 2 mol % of the Pb atoms of a lead zirconate titanate (PZT) represented by the composition formula Pb,[(Ti,Zr,),(Sn,Cr,),Sb,]O,has been displaced by La, wherein 0.94≦A≦1.02, 0.46≦x≦0.51, 0.01≦y≦0.5, 0.01≦b≦0.03, 0.01≦c≦0.04,a+b+c=1.