Ambient light sensor
US6396040B1 · kind B1 · utility
93Cited by
46References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 4, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Aug 4, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved ambient light sensor 20 is provided. Light 105 passes to at least two photosensors 30, 35 with different peak response frequencies. A controller 80 accepts output signals from the photosensors 30, 35 and operates vehicle systems (e.g., headlights 70 or environmental controls 75) accordingly. The controller 80 may distinguish between natural and artificial light, so that headlights 70 are illuminated while a vehicle passes through a well lit tunnel, or is exposed to lights from another vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.