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US 4,359,726 AGranted
Composite sheets constituting electromechanical transducers and transducers equipped with such sheets
OwnerJacques Lewiner, Claude Hennioninventors
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OwnerJacques Lewiner, Claude Hennioninventors
Estimating the term…
The invention relates to a flexible composite sheet designed to constitute an undersheet behaving as an electromechanical transducer in order to detect the apnea of subjects lying on it. This sheet comprises, in addition to a foil sensitive to pressure in the sense of electromechanical transduction (an electret or polarized piezo-electric foil), two film electrodes and two protective foils. Spacing shims are glued to the two foils against which they are juxtaposed. When the sensitive foil is an electret, the shims are directly interposed between the sensitive foil and one of the two electrodes. When the sensitive foil is a polarized piezo-electric foil, the shims are directly interposed between one of the electrodes and the correspoding external protective foil.
Relatively flexible and extended composite sheet, constituting an electromechanical transducer and comprising a foil sensitive to pressure in the sense of electromechanical transduction, said pressure sensitive foil being interposed between two conductive foils or electrodes themselves covered externally with protective foils, said composite sheet also comprising, between the pressure sensitive foil and one of the protective foils, spacing shims of which the two opposite surfaces are glued respectively to the two opposite adjacent areas.
Dependencies are inferred from the claim text.