Touch switch
US4123631A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1977 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Feb 16, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/962
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved touch actuated capacitance switch. A series of conductive touch pads are formed on one face of a dielectric material substrate plate. The touch pads are deposited by techniques which result in metallic films that are quite sensitive to damage by abrasion. To protect these pads, a protective overcoat is put over each touch pad, the overcoat obscuring no more than about seventy-percent of the total area of the touch pad. On the other face of the substrate plate are adhered a series of conductive sites, each site being in alignment across the thickness of the substrate plate with one of the touch pads. The conductive sites are then interconnected by a conductor network to give a predefined logic pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.