Apparatus for condensing light from multiple sources using Bragg gratings
US8634120B2 · kind B2 · utility
97Cited by
8References
25Claims
0Family size
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Key dates
| Filing date | Oct 27, 2006 |
| Grant date | Jan 21, 2014 |
| Priority date | — |
| Expiry date | Sep 16, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/62
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color sequential illumination device including in series: first and second light sources; a condenser lens; and a grating device. The grating device includes at least one Bragg grating. The condenser lens directs light from the first and second sources into the grating device at first and second incidence angles respectively. The grating device diffracts light from the first and second sources into a common direction. Desirably, the Bragg gratings are Electrically Switchable Bragg Gratings. In one embodiment the light sources are Light Emitting Diodes. Alternatively lasers may be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.