Light emitting diode-light guide coupling apparatus

Details Light emitting diode-light guide coupling apparatus Light emitting diode-light guide coupling apparatus

2009-08-28

2011-11-29

Husar, Stephen F (Department: 2875)

Illumination

Light fiber, rod, or pipe

Light emitting diode

C362S228000, C362S294000, C362S560000, C362S580000, C362S581000, C385S088000, C385S092000

Reexamination Certificate

active

08066417

ABSTRACT:
Different arrangements for improving the coupling-in efficiency between an LED assembly and a light guide are disclosed. In a first arrangement, a substantially planar end of a light guide is seated on a perimeter wall of a support that encloses a LED assembly, and a reflecting surface enhances coupling efficiency of a light guide. Alternative arrangements use a separate coupler disposed between the LED assembly and the light guide, which coupler has a paraboloid or aspheroid conformation to develop substantially collimated light that is directed into the light guide. The cavity around the LED assembly and within the coupler, may be air or a material having an index of refraction that closely matches the index of refraction of the light guide material.

REFERENCES:
patent: 4767172 (1988-08-01), Nichols et al.
patent: 5732176 (1998-03-01), Savage, Jr.
patent: 6832861 (2004-12-01), Kragl
patent: 7276737 (2007-10-01), Camras et al.
patent: 7279345 (2007-10-01), Camras et al.
patent: 7360924 (2008-04-01), Henson et al.
patent: 7543957 (2009-06-01), Balazs et al.
patent: 2004/0114880 (2004-06-01), Ebbecke

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