Keyboard switch assemblies
US4085306A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1977 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Jun 9, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2227/026
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A keyboard assembly includes an insulative substrate upon which are carried a plurality of conductive paths. Respective portions of the paths are selectively bridged upon depression of a dome shaped conductive resilient contact element. Each contact element has a single foot disposed along a marginal portion thereof to allow the dome shaped element to be deformed downwardly upon depression at its apex. The foot of each contact element is in physical and electrical contact with selected ones of the conductive paths and the dome shaped element is adapted to simultaneously engage a plurality of such paths upon depression at the apex. An indentation is provided in the substrate immediately beneath the apex of each contact element to better assure simultaneous contact of the plurality of conductive paths immediately beneath the dome shaped contact element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.