The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2008
Filed:
Mar. 02, 2006
William J. Cassarly, Wooster, OH (US);
Thomas L. R. Davenport, Tucson, AZ (US);
John M. Davenport, Middleburg Heights, OH (US);
Chris H. Jenson, Twinsburg, OH (US);
William J. Cassarly, Wooster, OH (US);
Thomas L. R. Davenport, Tucson, AZ (US);
John M. Davenport, Middleburg Heights, OH (US);
Chris H. Jenson, Twinsburg, OH (US);
Energy Focus, Inc., Solon, OH (US);
Optical Research Associates, Pasadena, CA (US);
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.