Piezoelectric effect device

Details Piezoelectric effect device Piezoelectric effect device

1991-06-24

1993-10-05

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310346, H01L 4108

Patent

active

052508684

ABSTRACT:
A piezoelectric effect device has a piezoelectric body comprised of a sintered multilayer pillar composed of alternately laminated piezoelectric ceramic sheets and internal electrodes such that edges of the internal electrodes are alternately insulated every one another layers along opposite side faces of the sintered multilayer pillar, and a pair of external electrodes provided on the opposite side faces to electrically connect to noninsulated edges of the internal electrodes. There is provided a metal stem having a pair of hermetically sealed external terminals electrically coupled to the pair of external electrodes. A metal case having flexibility in a displacement direction of the piezoelectric body is seal-welded to the metal stem at their contacts to hermetically enclose the piezoelectric body. A pair of metal pads having a linear thermal expansion coefficient less than ten times as that of the piezoelectric body are provided to substantially cover opposite end faces of the piezoelectric body. One metal pad is centrally spot-welded to an inner face of the metal stem in opposed relation to one end face of the piezoelectric body and is secured thereto by an adhesive, and the other metal pad is centrally spot-welded to an inner face of the metal case in opposed relation to the other end face of the piezoelectric body and is secured thereto by an adhesive.

REFERENCES:
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patent: 4374472 (1983-02-01), Nishimura
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patent: 5038069 (1991-08-01), Lokasiewicz et al.
patent: 5059850 (1991-10-01), Yoshimura et al.

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