Composite sheets constituting electromechanical transducers and transducers equipped with such sheets
US4359726A · kind A · utility
Inventors
Key dates
| Filing date | Jan 27, 1981 |
| Grant date | Nov 16, 1982 |
| Priority date | — |
| Expiry date | Jan 27, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/80
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.