Piezoelectric/electrostrictive film-type element and method for

Details Piezoelectric/electrostrictive film-type element and method for Piezoelectric/electrostrictive film-type element and method for

1996-12-23

1998-09-29

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, 310324, H01L 4108

Patent

active

058149201

ABSTRACT:
A piezoelectric and/or electrostrictive film-type element comprises a zirconia substrate with a thin-walled diaphragm section provided integrally to cover and close a window to serve as a hollow space, and a film-shaped piezoelectric and/or electrostrictive operating section composed of a lower electrode, a piezoelectric and/or electrostrictive layer, and an upper electrode which are successively provided in a layered configuration on an outer surface of the diaphragm section in accordance with a film-forming method, wherein at least a part of a peripheral edge portion of the piezoelectric and/or electrostrictive layer extends laterally beyond a corresponding peripheral edge portion of the lower electrode to construct an overhang section located opposingly over the diaphragm section, and the overhang section is in a state of incomplete connection with respect to a partial region of the diaphragm section located just under by the aid of particles of an alumina-magnesia compound such as spinel particles allowed to intervene therebetween. Thus, it is possible to effectively improve, for example, the piezoelectric and/or electrostrictive characteristics such as the displacement amount, and the resonance frequency characteristics.

REFERENCES:
patent: 5089455 (1992-02-01), Ketcham et al.
patent: 5210455 (1993-05-01), Takeuchi et al.
patent: 5376857 (1994-12-01), Takeuchi et al.

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