Variable-distance proximity detector
US11722137B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2021 |
| Grant date | Aug 8, 2023 |
| Priority date | — |
| Expiry date | Oct 2, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960745
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosed apparatus may include a capacitive proximity sensor that increases capacitance in response to proximity of an object; a reference capacitor in parallel with the capacitive proximity sensor; a switch that connects and disconnects the capacitive proximity sensor and the reference capacitor; and a capacitance sensing block that generates a capacitance signal based on a capacitance of the reference capacitor when the switch is in a disconnecting state and based on the capacitance of the reference capacitor and a capacitance of the capacitive proximity sensor when the switch is in a connecting state. Various other methods and systems are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.