Lighting device
US9374860B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2014 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Sep 26, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device includes a first light source composed of first LEDs each configured to emit light with a first color temperature, a second light source composed of second LEDs each configured to emit light with a second color temperature lower than the first color temperature, a lighting circuit, and a control circuit. The number of second LEDs is less than that of the first LEDs. The lighting circuit is configured to cause the first and second light sources to light on by supplying first and second drive currents to the first and second light sources, respectively. The control circuit is configured to control lighting conditions of the first and second light sources so that: total light intensity of the first light source varies in response to a dimming signal; and total light intensity of the second light source is kept constant independently of the dimming signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.