Stacked type piezoelectric actuator

Details Stacked type piezoelectric actuator Stacked type piezoelectric actuator

1986-06-18

1989-12-05

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310359, 310366, 310346, H01L 4108

Patent

active

048854980

ABSTRACT:
A stacked type piezoelectric actuator comprises a main stack of a plurality of electrostrictive strain elements stacked one on another. Each strain element comprises a first piezoelectric element plate having a first direction of polarization and a second piezoelectric element plate having a second direction of polarization. An end electrostrictive strain element is mounted on an end of the stack and has a lower shear strain component during widthwise expansion and contraction of the actuator. The end element includes either a stack of two or more of the first piezoelectric element plates or a pair of first and second piezoelectric element plates when the first piezoelectric element plate has a piezoelectric strain constant d.sub.33 that is less than the strain constant d.sub.33 of the first and second piezoelectric element plates in the main stack.

REFERENCES:
patent: 2998535 (1961-08-01), Church et al.
patent: 3349259 (1967-10-01), Kistler
patent: 3390287 (1968-06-01), Sonderegger
patent: 3441754 (1969-04-01), Heny
patent: 3569749 (1971-03-01), Zeiringer
patent: 3673442 (1972-06-01), Sonderegger
patent: 4471256 (1984-09-01), Igashira et al.
patent: 4570098 (1986-02-01), Tomita et al.

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