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US 2004/0201331 A1Published application
Polymer film composite transducer
AssigneeSouthwest Research Institute
InventorThomas E. Owen
Life of this patent
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Abstract
A composite piezoelectric transducer, whose piezoeletric element is a “ribbon wound” film of piezolectric material. As the film is excited, it expands and contracts, which results in expansion and contraction of the diameter of the entire ribbon winding. This is accompanied by expansion and contraction of the thickness of the ribbon winding, such that the sound radiating plate may be placed on the side of the winding.
Claims10
A composite piezolectric transducer, comprising:
- a ribbon-wound piezoelectric element having a winding of piezolectric film ribbon wound against an electrically insulating material;
- wherein the piezoelectric film ribbon has three layers:
- two outer conductive layers and an inner piezoelectric polymer film layer;
- wherein the winding has a disk shape with a substantially circular top surface and bottom surface;
- a face plate covering the top surface or bottom surface, the face plate operable to couple acoustic activity between the piezoelectric element and the environment external to the transducer;
- and
- a pair of electrically conductive leads, one to each conductive layer.
4 more elements
A composite piezolectric transducer, comprising:
- a ribbon-wound piezoelectric element having a first winding of piezolectric film ribbon wound against a second winding of piezoelectric film ribbon;
- wherein each piezoelectric film ribbon has three layers:
- two outer conductive layers and an inner piezoelectric polymer film layer;
- wherein the winding has a disk shape with a substantially circular top surface and bottom surface;
- a face plate covering the top surface or bottom surface, the face plate operable to couple acoustic activity between the piezoelectric element and the environment external to the transducer;
- and
- a pair of electrically conductive leads, one lead to each conductive layer.
4 more elements
Dependencies are inferred from the claim text.