Capacitive control interface device and method adapted to the implementation of highly resistive measurement electrodes
US9983746B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 2014 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Aug 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04107
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interface device for detecting at least one object of interest is disclosed. The interface device has a detection surface provided with a plurality of capacitive-measurement electrodes. The measurement electrodes are driven at an alternating electrical excitation potential, and the capacitive coupling between the measurement electrodes and the object of interest can be measured. Guard elements can be driven at an alternating electrical potential substantially identical to the alternating electrical excitation potential of the measurement electrodes. The alternating electrical excitation potential has an excitation frequency low enough such that the measurement electrodes and linking tracks capacitively coupled to the object of interest have an electrical impedance at the excitation frequency whose resistive part is much lower than the modulus of the reactive part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.