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US 4,379,322 AGranted
Compound reflector for luminaire
AssigneeMcGraw-Edison Company
InventorJames P. Kelly
Life of this patent
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AssigneeMcGraw-Edison Company
InventorJames P. Kelly
Estimating the term…
An outdoor luminaire having a reflector adapted to provide uniform illumination of a relatively large, generally level surface. The reflector is comprised of a pair of side segments and contiguous concave top and bottom segments surrounding a light center. The top segment includes three cylindrical portions which are circular in section, the portion adjacent the top edge having its circular center well in front of the light center, while the other two circular cylindrical portions have their centers behind the light center. The bottom segment includes a transient portion and a cylindrical portion which is parabolic in section. The parabolic cylindrical portion is adjacent the bottom edge and has its foci at the light center. The side segments are tilted to reflect light from the light center directly out of the luminaire. The light pattern produced by the reflector is generally rectangular in shape with relatively sharp, straight, uniform light cut-off at both the front and sides with square corners at the forward edges.
A luminaire adapted to illuminate a generally planar surface with substantially constant light magnitude with a light pattern having relatively sharp bottom and top cut-offs comprising:
Dependencies are inferred from the claim text.