Luminaire with improved lateral illuminance control

Illumination – Light source and modifier

Reexamination Certificate

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Details

C362S092000, C362S560000, C362S624000, C362S626000

Reexamination Certificate

active

11366711

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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US 6,419,383, 07/2002, Lundin (withdrawn)
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.

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