Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating inorganic material – not as pigments,...
Patent
1994-12-28
1996-08-06
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Producing or treating inorganic material, not as pigments,...
264 401, B28B 1100
Patent
active
055431062
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.
REFERENCES:
patent: 5310511 (1994-05-01), Marcus
patent: 5444326 (1995-08-01), Yoshida
Fiorilla Christopher A.
Murata Manufacturing Co. Ltd.
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