Automatic momentary secondary light source assembly
US7253570B2 · kind B2 · utility
3Cited by
12References
18Claims
0Family size
Inventor
Key dates
| Filing date | Sep 8, 2004 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | May 2, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A secondary light assembly emits light into an area lit by a primary light source. The secondary light assembly includes a light sensor for sensing light emitted from the primary light source. A secondary light source is operatively connected to the light sensor. A controller is electrically connected to the light sensor and the secondary light source. The controller calculates a rate of change of light emission from the primary light source such that the controller turns the secondary light source on when the rate of change of light emission from the primary light source is above a predetermined rate threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.