Stack-type piezoelectric device

Details Stack-type piezoelectric device Stack-type piezoelectric device

2006-07-04

2006-07-04

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07071600

ABSTRACT:
Provided is a stack-type piezoelectric device capable of preventing cracks from being made in a portion between adjacent individual electrodes and a relay common electrode in a piezoelectric layer with individual electrodes formed therein, because of a polarization process or the like.In a stack-type piezoelectric device1, each piezoelectric layer3with individual electrodes2formed therein also has relay common electrodes6formed so as to be electrically connected to each of common electrodes4, 4adjacent in a stack direction. For this reason, for example, where a voltage is applied between individual electrodes2and common electrodes4to effect a polarization process, electric fields are generated not only in the thickness direction of the piezoelectric layer3, but also between adjacent individual electrodes2and relay common electrode6. At this time, since an end2bof each individual electrode2adjacent to the relay common electrode6has a semicircular contour on the relay common electrode6side, it is feasible to prevent cracks from being made in a portion between adjacent individual electrodes2and relay common electrode6in the piezoelectric layer3.

REFERENCES:
patent: 6800988 (2004-10-01), Ribak
patent: A 2001-260340 (2001-09-01), None
patent: A 2002-019102 (2002-01-01), None
patent: A 2002-254634 (2002-09-01), None
patent: A-2002-254634 (2002-09-01), None

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