Capacitive switch and panel
US4379287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1980 |
| Grant date | Apr 5, 1983 |
| Priority date | — |
| Expiry date | Jan 23, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/96023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A user, touch actuable switch panel of the capacitive type that includes one or more touch actuable capacitive switches, each switch including at least two capacitive plate elements formed on a dielectric panel. Conductive paths formed on the dielectric panel interconnect the capacitive plate elements to a source for applying signals to the capacitive plate elements forming said capacitive switches and sensing a resulting change in signal level when a selected switch is actuated by the user. Trim tabs formed on the dielectric panel are provided to balance the effect of stray capacitance between the conductive paths and the capacitive plate elements to maintain the level of change of signal at a determined value upon the actuation of each of said one or more capacitive switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.