Capacitive switch
US4047241A · kind A · utility
4Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1976 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Apr 12, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A capacitive switch includes: an electrical circuit formed by two spaced pads of conductive material on an insulative substrate; and a capacitive coupling member on the end of a keystem wherein the end of the keystem has a looped ribbon formed by two layers of insulating material sandwiching a layer of conductive material. As the keystem is urged toward the substrate a monotonically increasing area of the ribbon mechanically contacts the pads so that a monotonically increasing capacitive coupling is made between the two spaced pads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.