Proximity sensor
US11923841B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2023 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Mar 24, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/94108
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A proximity sensor includes a light source, an optical sensing element, and an integration circuit. The light source is turned on and off several times during a measurement time interval. When the light source is turned on and off, the optical sensing element senses the surrounding light to generate a first current and a second current, respectively. The integration circuit integrates the first current and the second current to generate a first integration signal and a second integration signal respectively for determining whether an object is approaching. When the light source is turned on, the present second integration signal is stored, and a stored first integration signal is used as a starting value to integrate the first current. When the light source is turned off, the present first integration signal is stored, and the stored second integration signal is used as a starting value to integrate the second current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.