Membrane switch with series resistor
US5120912A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Jul 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/0213
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A membrane switch is formed of an upper layer of electrically insulating material, a lower layer of electrically insulating material, and an intermediate layer of electrically insulating material interposed between the upper layer of electrically insulating material and the lower layer of electrically insulating material. A first electrically conductive layer is printed upon the lower surface of the upper layer of electrically insulating material. A second electrically conductive layer is printed upon the upper surface of the lower layer of electrically insulating material. A resistive component is printed upon an end portion of the second electrically conductive layer. The intermediate layer of electrically insulating material is provided with an opening so as to enable the first electrically conducting layer to initially engage with the resistive component when the upper layer of electrically insulating material is moved downwardly by means of an actuating member so as to produce an electrical connection between first and second switch terminals of the first and second electrically conductive layers which exhibits low current flow corresponding to a first slidable position of the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.