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. 23, 1982
Filed:
Feb. 18, 1981
Applicant:
Inventors:
Youhachi Yamashita, Kawasaki, JP;
Katsunori Yokoyama, Ebina, JP;
Tadashi Ido, Yokohama, JP;
Seiichi Yoshida, Higashitateishi, JP;
Assignee:
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
252 629 ;
Abstract
A piezoelectric oxide material suitable for an ultrasonic probe is provided. The piezoelectric material has the general formula ##EQU1## wherein 0.01.ltoreq.X.ltoreq.0.10 and 0.20.gtoreq.a.ltoreq.0.35, to which is added, as an additive, 0.05 to 2.0% by weight of at least one of MnO, NiO and Fe.sub.2 O.sub.3 based on the total content of the basic composition; the thickness coupling factor (Kt) is 50% or more; the ratio (Kt/Kp) of the thickness coupling factor (Kt) to the planar coupling factor (Kp) is 10 or more.