Transducer structure
First Claim
1. An electrical device consisting essentially of three layers of piezoelectric material and electrical means in association with said layers for conveying a signal from each of said layers wherein said layers are stacked on top of each other with two outer layers and one middle layer, said middle layer has twice the thickness of any one of said outer layers and al three layers have face surfaces that are defined by length and width dimensions of said layers.
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Accused Products
Abstract
A flexible three-layer transducer wherein the layers are vertically stackednd are coextensive with each other, the middle layer having twice the thickness of any one of the outer layers, and electrodes between and on the outside surface of the layers for conveying signals from the layers, said layers are made from PVDF or flexible piezoceramic sheets.
60 Citations
17 Claims
- 1. An electrical device consisting essentially of three layers of piezoelectric material and electrical means in association with said layers for conveying a signal from each of said layers wherein said layers are stacked on top of each other with two outer layers and one middle layer, said middle layer has twice the thickness of any one of said outer layers and al three layers have face surfaces that are defined by length and width dimensions of said layers.
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11. Transducer consisting essentially of two outer and one middle vertically stacked coextensive layers of piezoelectric materials, and electrodes associated with said layers for conveying signals from each of said layers, said middle layer having twice the thickness of any one of said outer layers.
- 16. An electrical device comprising a stack of piezoelectric layers containing a middle layer and two outer layers on either side of said middle layer and an electrically conductive surface disposed between each of said layers for providing electrical contact between adjoining layers, said middle layer having the same dimensions as said outer layers except its thickness is twice that of one of said outer layers, said middle and outer layers being in the form of sheets, said two outer layers having about the same thickness and having dimensions of about 1-20 inches by about 0.1-5 inches by about 0.1-10 mils in thickness, said outer layers being polarized in the same direction, and said middle layer being polarized in a direction opposite from the direction in which said outer layers are polarized.
Specification