Remote wavelength conversion in an illumination device
US7070300B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2004 |
| Grant date | Jul 4, 2006 |
| Priority date | — |
| Expiry date | Jul 20, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/856
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination device uses a wavelength converting element, such as a phosphor layer, that is physically separated from a light source, such as one or more light emitting diodes, a Xenon lamp or a Mercury lamp. The wavelength converting element is optically separated from the light source, so that the converted light emitted by the wavelength converting element is prevented from being incident on the light source. Accordingly, the temperature limitations of the wavelength converting element are removed, thereby permitting the light source to be driven with an increased current to produce a higher radiance. Moreover, by optically separating the wavelength converting element from the light source, the conversion and recycling efficiency of the device is improved, which also increases radiance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.