Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-12-18
2007-12-18
San Martin, J. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S364000, C310S365000
Reexamination Certificate
active
11046699
ABSTRACT:
The invention provides a laminate-type piezoelectric element comprising a ceramic laminate10with ceramic layers11and internal electrode layers12respectively stacked alternately, and a pair of external electrodes respectively connecting with a pair of connecting areas15formed at an outer peripheral area of the ceramic laminate10. The internal electrode layer comprises an internal electrode part120with electric conductivity, and a non-pole part120where the internal electrode part120does not exist at the inside near an outer peripheral area. The ceramic laminate10comprises stress relaxation parts13able to modify more easily their shapes than the ceramic layers11, along at least a part of said internal electrode layers. This stress relaxation part13is placed so as to overlap with the non-pole part129of either of the internal electrode layers12, in a stacking direction of the ceramic laminate10.
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Ito Tetsuji
Iwase Akio
Kadotani Shige
Ooshima Toshio
Aguirrechea J.
Denso Corporation
Martin J. San
Nixon & Vanderhye P.C.
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