Push-button keyboard assembly with EMI and RFI-shielded multiple individually-replaceable switch modules
US4814566A · kind A · utility
Inventor
Key dates
| Filing date | Oct 20, 1987 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Oct 20, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2239/008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A keyboard assembly includes a printed circuit board having conductive paths defining a plurality of switch sites. Contact terminals are connectable in electrical circuits with the conductive paths. The assembly also includes an electrically-groundable conductive panel overlying the board and having a plurality of apertures defined therein in registry with the switch site. A dielectric layer is disposed between the panel and board providing electrical isolation therebetween. A plurality of individually-replaceable EMI RFI-shielded switch modules are installed in registry with the apertures on the conductive panel, in overlying relation to the switch sites, and electrically connected to the conductive panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.