Piezoelectric actuator and liquid discharge head using the same

Details Piezoelectric actuator and liquid discharge head using the same Piezoelectric actuator and liquid discharge head using the same

2011-08-16

2011-08-16

Rosenau, Derek J (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S330000

Reexamination Certificate

active

07999441

ABSTRACT:
The piezoelectric actuator includes a piezoelectric film between two electrode layers and a diaphragm. Assuming that: each elastic coefficient of all materials is isotropic and a distortion amount of the piezoelectric film by an electric field is isotropic in all in-plane directions; a point located on a diaphragm surface and having a maximum displacement when a predetermined electric field is applied to distort the piezoelectric film, is expressed by PδMAX; and a point located on a circumference of a reference-circle having PδMAXas a center and having a minimum difference in displacement from PδMAXis expressed by PδA, the diaphragm has a shape capable of determining an axis A1set in a straight-line joining PδMAXand PδA, the diaphragm comprises a single-crystalline-material in which a plane orthogonal to A1and perpendicular to an axis A2on the diaphragm surface, is a {110}-plane, and the piezoelectric film is a {100}-single-orientation film.

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