Piezo-electric actuator operable in an electrolytic fluid
First Claim
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1. A piezo-electric actuator operable in a fluid, the actuator comprising:
- a piezoelectric element having a plurality of groups of interior electrodes and at least one exterior electrode, each exterior electrode being at a constant electrical potential;
electrical circuitry for switching an electrical potential of at least one interior electrode; and
a seal surrounding the piezoelectric element, the seal being substantially impermeable to the fluid.
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Abstract
A piezo-electric actuator operable in a fluid. The actuator has a piezo-electric element having one or more layers of piezo-electric material and electrodes adjacent to the piezo-electric material, the electrodes being coupled to electrical leads. A conductive layer surrounds the piezo-electric element, serving as a Faraday cage for shielding the fluid from effects due to electric fields within the conductive layer. A seal substantially impermeable to the fluid surrounds the piezo-electric element.
74 Citations
3 Claims
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1. A piezo-electric actuator operable in a fluid, the actuator comprising:
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a piezoelectric element having a plurality of groups of interior electrodes and at least one exterior electrode, each exterior electrode being at a constant electrical potential;
electrical circuitry for switching an electrical potential of at least one interior electrode; and
a seal surrounding the piezoelectric element, the seal being substantially impermeable to the fluid. - View Dependent Claims (2)
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3. A method for activating a piezo-electric actuator for operation in a fluid, the piezo-electric actuator having an interior electrode and a plurality of exterior electrodes, the method comprising:
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sealing the actuator from the fluid by means of a seal substantially impermeable to the fluid;
maintaining constant the electrical potential of each exterior electrode; and
applying an electrical potential to the interior electrode with respect to the exterior electrodes.
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Specification
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Current AssigneeDeka Products Limited Partnership
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Original AssigneeDeka Products Limited Partnership
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InventorsOrmerod, William
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Primary Examiner(s)Ramirez, Nestor
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Assistant Examiner(s)MEDLEY, PETER M
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Application NumberUS09/605,927Time in Patent Office503 DaysField of Search310/328, 310/330, 310/331, 310/332, 310/340US Class Current310/328CPC Class CodesH10N 30/2042 Cantilevers, i.e. having on...H10N 30/883 Further insulation means ag...
