Capacitive keyboard operable through a thick dielectric wall
US4924222A · kind A · utility
64Cited by
8References
12Claims
0Family size
Inventors
Key dates
| Filing date | Oct 16, 1985 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Oct 16, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/9606
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A keyboard with capacitive keys is operable through a thick dielectric wall which may be integral therewith. The keyboard may be installed inside an agency or store and coupled to a micro-informatic system providing audiovisual information selected at the request of a passer-by on the street operating the keyboard through a thick shop window. The keyboard includes a base panel (1) made of insulating material provided with Cnm electrodes integrated into the panel. with a free running oscillator being associated with each electrode key. A method of scanning the keyboard is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.