Keyboard with concave and convex domes
US4128744A · kind A · utility
43Cited by
15References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1977 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | Feb 22, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2229/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Keyboard device having a top flexible plastic contactor sheet with a first circuit pattern thereon, said first pattern comprising contactors and circuit lines, a bottom sheet having a second circuit pattern comprising contacts and circuit lines, an insulator spacer having openings in register with said contactors, said sheet having formed therein one or a plurality of protrusions or domes which support a portion of the first circuit pattern, and means for continuously urging the one or plurality of protrusions or domes supporting a portion of said first circuit pattern against a portion of said second circuit pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.