Piezoelectric actuator

Details Piezoelectric actuator Piezoelectric actuator

2004-11-18

2008-09-30

Dougherty, Thomas M (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S366000

Reexamination Certificate

active

07429813

ABSTRACT:
Piezoelectric actuators having ceramic layers and electrode layers, and being provided with an outer cover layer on each end face of the piezoelectric actuator. The ceramic layers and the outer cover layers each have a predetermined dielectric constant. Rapid switching of the actuator results in considerable electromagnetic interference, which must be reduced through complex measures involving the control unit or electric lines. The device reduces electromagnetic interference by decreasing the interfering capacitance between the actuator and the actuator housing connected to ground electrically. The outer cover layers have a lower relative dielectric constant than the ceramic layers between the outer cover layers.

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