Composite conformable sheet electrodes
First Claim
1. A composite sheet electrode, comprising a conductive polymer sheet or film and a slit-and-expanded screen formed from a sheet of a selected metal, said conductive polymer in said polymer sheet being ethylene/propylene/diene elastomer (EPR) and said metal sheet being embedded into said polymer sheet and having exposed portions to which electrical leads can be soldered.
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Accused Products
Abstract
A method is described for making an electroconductive composite sheet electrode which is conformable and in which a slit-and-expanded or perforated nickel screen is embedded by heat and pressure, so that electrical leads can be easily and strongly attached to the nickel screen before or after integrally bonding a electroconductive sheet electrode to each side of at least one adjacent piezoelectric ceramic/polymer composite sheet electrode which is non-conductive. After poling, the resultant transducer has an increased combined transverse stiffness which increases the hydrostatic voltage coefficient, gh, as well as the overall hydrophone Figure of Merit. Because the nickel screen is formed from a continuous metal sheet by slitting and traction or by perforation, it possesses internal electrical continuity and is much more electroconductive than a conventional woven metal wire screen of the same dimensions, thereby enabling the conductive composite electrode to show higher electrical conductivity than a similar woven wire-reinforced one and also lowering the thermally generated electrical noise of the piezoelectric composite transducer formed therefrom.
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Citations
20 Claims
- 1. A composite sheet electrode, comprising a conductive polymer sheet or film and a slit-and-expanded screen formed from a sheet of a selected metal, said conductive polymer in said polymer sheet being ethylene/propylene/diene elastomer (EPR) and said metal sheet being embedded into said polymer sheet and having exposed portions to which electrical leads can be soldered.
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10. A piezoelectric transducer, having a substantially increased hydrostatic piezoelectric voltage coefficient and lowered thermally generated electrical noise, comprising:
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A. A piezoelectric composite sheeet comprising a thermoplastic polymer and a piezo-ceramic powder having a particle size in the 1-20 μ
m range;B. a conductive composite sheet electrode, containing a thermoplastic polymer and a continuous slit-and-expanded metal screen, said screen being embedded in said polymer and one of said composite sheet electrodes being bonded to each side of said piezoelectric composite sheet; and C. electrical leads attached to exposed portions of said metal screen. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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11. A piezoelectric transducer, having a substantially increased hydrostatic piezoelectric voltage coefficient and lowered thermally generated electrical noise, comprising:
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A. a piezoelectric composite sheet comprising a thermoplastic polymer and a piezo-ceramic powder having a particle size in the 1-20 μ
m range;B. a conductive composite sheet electrode, containing a thermoplastic polymer and a continuous metal screen, which is bonded to each side of said piezoelectric composite sheet; and C. electrical leads attached to exposed portions of said metal screen, wherein said polymer, in both said piezoelectric composite sheet and in said composite sheet electrode, is an ethylene/propylene/diene elastomer (EPR).
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Specification