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. 06, 1996
Filed:
Dec. 28, 1994
Applicant:
Inventor:
Mikio Nakashima, Nagaokakyo, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B / ;
U.S. Cl.
CPC ...
264430 ; 264 401 ;
Abstract
A plurality of polarization electrodes are provided oppositely on front and back surfaces of a piezoelectric ceramic substrate, while the polarization electrodes on the front surface and the polarization electrodes on the back surface are connected respectively by connecting electrodes which are formed on positions not opposed to each other. A dc voltage is applied across the polarization electrodes on the front and back surfaces for polarizing the substrate to form a plurality of polarized portions in the substrate. Thus, it is possible to reduce stress concentration in polarizing process, thereby inhibiting the substrate from cracking.