Stacked piezoelectric actuator

Details Stacked piezoelectric actuator Stacked piezoelectric actuator

1996-12-30

1998-11-10

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310330, H01L 4108

Patent

active

058348794

ABSTRACT:
Disclosed is a stacked piezoelectric actuator displaceable by bending comprising a plurality of piezoelectric ceramic layers stacked on one surface of a core material, and a plurality of piezoelectric ceramic layers stacked on the other surface thereof, said piezoelectric ceramic layers stacked on both surfaces being successively increased in piezoelectric constant d.sub.31 inner layers to outer layers. The piezoelectric coefficient d.sub.31 is derived from the following equation (2): ##EQU1## wherein k is the electromechanical coupling coefficient, the length vibration of a rectangular plate is taken as k.sub.31, and the unit of the piezoelectric coefficient d.sub.31 is C/N (m/V). The piezoelectric coefficient d.sub.33 in the longitudinal vibration of a column determined by the following equation (3) is a value for the whole stacked layers, and in the present invention, it is necessary that the piezoelectric coefficient d.sub.31 for each of the stacked piezoelectric ceramic layers satisfies the above-mentioned equation. ##EQU2## wherein k is the electromechanical coupling coefficient, and the longitudinal vibration of a column is taken as k.sub.33.

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