Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1979-01-31
1980-11-11
Brown, Thomas W.
Electrical generator or motor structure
Dynamoelectric
Rotary
310334, 310369, H01L 4110, H04R 1700
Patent
active
042334772
ABSTRACT:
A flexible, composite, acoustical energy transducer made from ferroelectric, piezoelectric, and/or electrostrictive materials in combination with a polymer, such as silicone or polyvinylidene fluoride (PVF.sub.2), preferably having electroelastic properties. The materials are formed into platelets or wafers which have electrodes on their facial surfaces and are arranged within the polymer with each wafer in the same x-y plane such that their polarizations are in the same direction and perpendicular to the x-y plane. The wafers are aligned in directed rows, spaced from each other and are totally encased within the polymer. Thin conductive sheet or foil electrodes are secured to the upper and lower faces of the polymer and a conductive material between each wafer and the foil electrically connects the wafers to the foil electrodes. To protect the electrodes and prevent electrical shorting, a rubber coating or any other suitable insulator may be applied to the outside of the electrodes. The polymer is flexible and therefore the transducer can be formed into most any desired shape or placed on a flat or curved surface.
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patent: 2911484 (1959-11-01), Spitzer et al.
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patent: 3423543 (1969-01-01), Kompanek
patent: 3924259 (1975-12-01), Butler et al.
patent: 3992693 (1976-11-01), Martin et al.
patent: 4118649 (1978-10-01), Shwartzman et al.
"Real-time Imaging of Internal Body Structures," ULTRASONICS, Nov., 1974, 235.
Pohanka Robert C.
Rice Roy W.
Brown Thomas W.
Crane Melvin L.
Schneider Philip
Sciascia R. S.
The United States of America as represented by the Secretary of
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