Illumination – Light source and modifier
Reexamination Certificate
2008-05-20
2008-05-20
Payne, Sharon E (Department: 2875)
Illumination
Light source and modifier
C362S092000, C362S560000, C362S624000, C362S626000
Reexamination Certificate
active
07374313
ABSTRACT:
A luminaire with improved lateral illuminance control comprising a light pipe with a longitudinal center is disclosed. A light-extraction means applied to a radial swath of the light pipe has a longitudinal portion having dimension along its length, centered about a slice on the light pipe longitudinally; said slice being orthogonal to the longitudinal center and located in a propagation plane through which light propagates to a virtual target area intersecting the propagation plane. The light pipe intervenes between the radial swath and the target area. A first average efficiency point of the light-extraction means corresponds to the minimum distance to the target area being at least approximately 20% less than a respective, second average efficiency point corresponding to a respective maximum distance to such area. The light-extraction means efficiency varies from the first average efficiency point to the second average efficiency point though more than one non-zero value.
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Photograph of light pipe shown at the following two exhibitions: (1) Defense Advanced Research Projects Agency (DARPA), attended by military—and military contractors, Mar. 9-11, 2004 (DARPA) (2) Light Fair, Las Vegas, Nevada, attended by the public, Mar. 31-Apr. 2, 2004.
4 pages entitled “Uniglo Backlighting” from http://www.poly-optical.com/uniglo.html webpage—(viewed on May 2, 2004) showing uniform extraction of light from a light guide—admitted as prior art.
2 pages entitled “Design of Luxaura Light Guide” from http://www.luxaura.com/tech.shtml website—(viewed on May 2, 2004) showing emitting light in a radial swath—admitted as prior art.
Cassarly William J.
Davenport John M.
Davenport Thomas L. R.
Jenson Chris H.
Bruzga Charles E.
Bruzga & Associates
Energy Focus, Inc.
Optical Research Associates
Payne Sharon E
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