Capacitive sensor
US7541816B1 · kind B1 · utility
19Cited by
13References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2008 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Aug 27, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960725
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a capacitive sensor, a sensing electrode is positively charged, the sensing electrode and a sensing capacitor are charge-balanced, the sensing electrode is negatively charged, and then the sensing electrode and the sensing capacitor are again charge-balanced. The sensing electrode is positively and negatively charged in the same period when the capacitive sensor is sensed. So, the invention can not only effectively improve the high-frequency external interference but also effectively resist the interference when an external direct current electrical field approaches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.