Prestressed piezoelectric audio transducer
Abstract
Abstract A COMBINATION PIEZOELECTRIC TRANSDUCER AND DIAPHRAGM INCLUDING A THIN CIRCULAR DISC OF POLARIZED PIEZOELECTRIC CERAMIC MATERIAL STRESSED INTO A DISH-SHAPED CONFIGURATION AND CONFINED IN THAT CONFIGURATION BY A METAL RING ATTACHED TO THE EDGE OF THE DISC. A CONDUCTIVE METAL LAYER IS FORMED ON EACH OF THE MAJOR SURFACES OF THE DISC TO FORM A PAIR OF ELECTRODES FOR THE DISC, SO THAT THE APPLICATION OF ELECTRICAL SIGNALS TO THE ELECTRODES CAUSES THE DISC TO OPERATE INAN EXPANDER MODE, THEREBY PRODUCING MOVEMENT OF THE CENTER OF THE DISC IN A DIRECTION PERPENDICULAR TO THE MAJOR SURFACES THEREOF. MOVEMENT OF THE CENTER OF THE DISC IN A PERPENDICULAR DIRECTION TO THE MAJOR SURFACES THEREOF CAUSES A CORRESPONDING ELECTRICAL SIGNAL TO BE GENERATED ACROSS THE ELECTRODES.
Inventors
- 👤 Hugo W Schafft
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |