Operation setting device having stationary touch-sensitive control elements
US4334219A · kind A · utility
71Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1980 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Feb 19, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/9613
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The operation setting device includes a keyboard having stationary control keys arranged on a transparent support plate of insulating material, each key of the keyboard being formed of a pair of transparent electrically conductive material secured to the outer face of the support plate and being connectable to a switching device sensitive to a change of resistance between the contacts in each pair. A visual identification card is located behind the support plate and having its indentification signs in register with respective keys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.