Keyboard switch assembly with multiple isolated electrical engagement regions
US4164634A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1977 |
| Grant date | Aug 14, 1979 |
| Priority date | — |
| Expiry date | Jun 10, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2221/064
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch assembly includes an array of switches arranged on a substrate having a conductive pattern on a surface thereof defining a plurality of switch contacts. An apertured spacer is disposed adjacent the surface with an aperture being positioned in opposed relationship to each switch contact. A multi-conductive contact material is disposed to provide switch closure when forced through an aperture in the separator into engagement with a switch contact at a large number of separate conductive engagement regions. In one arrangement the multi-conductive contact material is a fine mesh woven wire screen stretched taut adjacent the separator while in another arrangement it is a uniaxially conducting material having a high density of parallel, spaced conductors extending perpendicular to the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.