Isolation membrane switch
US4237358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1979 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | May 7, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2239/044
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A membrane switch includes a substrate having a plurality of first conductors formed thereon and a flexible membrane having a plurality of second conductors formed thereon. A spacer is positioned between the substrate and membrane and there are openings in the spacer in register with aligned first and second conductors. To isolate the switch membrane, there is a pressure reduction membrane overlying and in contact with the exterior of the switch membrane and an isolation membrane positioned on top of the pressure reduction membrane. Areas of the pressure reduction membrane in register with the spacer openings are formed to reduce the required force thereupon to effect movement of the switch membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.