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US 5,334,903 AGranted
Composite piezoelectrics utilizing a negative Poisson ratio polymer
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorWallace A. Smith
Life of this patent
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Abstract
A piezoelectric composite which can be used as a transducer is constructed of parallel piezoelectric ceramic rods set in a passive polymer matrix which has a negative Poisson ratio whereby the electromechanical coupling of the transducer is greatly increased.
Claims7
A piezoelectric ceramic-polymer composite material comprising:
- a matrix of a polymer which has a negative Poisson ratio, a plurality of piezoelectric ceramic rods embedded in said matrix each of which rods has its longitudinal axis aligned in the same direction;
- and means for polarizing the composite with an electric field parallel to the axis of said rods.
A piezoelectric ceramic-polymer composite material of 1-3 connectivity for use as a transducer comprising:
- a passive polymer matrix which exhibits a negative Poisson ratio, a plurality of PZT piezoelectric rods embedded in said matrix, each of said rods having its longitudinal axis aligned in the same direction;
- and means for polarizing the composite with an electric field parallel to the axis of said rods.
Dependencies are inferred from the claim text.