Polymeric piezoelectric key actuated device
US3940637A · kind A · utility
97Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Apr 24, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/80
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A key input device which forms a key switch with high reliability or an integrated keyboard with small dimensions which can produce coded signals with high reliability and a S/N ratio of high value without any encoder circuits, comprising a piezoelectric polymer film, applied as a pressure sensor, having layer electrodes on both surfaces thereof and at least one device for straining the film, the straining device defining a key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.