Laminated piezoelectric keyboard
US4857887A · kind A · utility
57Cited by
9References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Oct 5, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/9643
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The keyboard comprises piezoelectric crystal elements arranged between laminates provided with conducting strips. A voltage is generated when pressure is applied to the elements. The keyboard is tensionless in its rest state and contains no unwanted air spaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.