Apparatus for condensing light from multiple sources using Bragg gratings
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United States of America Patent
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Oct 11, 2016
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app pub date -
Dec 19, 2013
filing date -
Nov 11, 2005
priority date (Note) -
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Abstract
There is provided a color sequential illumination device comprising in series: first and second light sources; a condenser lens; and a grating device. The grating device comprises 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 of the invention the light sources are Light Emitting Diodes. Alternatively lasers may be used.
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