Apparatus, method to change light source color temperature with reduced optical filtering losses
US8378563B2 · kind B2 · utility
34Cited by
0References
35Claims
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Assignee
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Key dates
| Filing date | Jan 14, 2011 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Aug 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/851
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The efficiency and color temperature of a lighting device may be improved by using wavelength shifting material, such as a phosphor, to absorb less desired wavelengths and transmit more desired wavelengths. A reflective filter (e.g., dichroic or dielectric mirror material) may pass desired wavelengths while returning or reflecting less desired wavelengths away from an optical exit back toward wavelength shifting material which may either be disposed in the optical path or on the periphery of the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.