Linear LED illumination device with improved color mixing
US9360174B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2013 |
| Grant date | Jun 7, 2016 |
| Priority date | — |
| Expiry date | Jul 6, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A linear multi-color LED illumination device that produces uniform color throughout the output light beam without the use of excessively large optics or optical losses is disclosed herein. Embodiments for improving color mixing in the linear illumination device include, but are not limited to, a shallow dome encapsulating a plurality of emission LEDs within an emitter module, a unique arrangement of a plurality of such emitter modules in a linear light form factor, and special reflectors designed to improve color mixing between the plurality of emitter modules. In addition to improved color mixing, the illumination device includes a light detector and optical feedback for maintaining precise and uniform color over time and/or with changes in temperature. The light detector is encapsulated within the shallow dome along with the emission LEDs and is positioned to capture the greatest amount of light reflected by the dome from the LED having the shortest emission wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.