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AssigneeInternational Telephone and Telegraph Corporation
InventorsJocelyn T. Barnes, Chester A. Hard, III, Billy L. Shelby, Charles H. Loch
Estimating the term…
A luminaire for roadway lighting using a one-piece reflector developing at least two collimated beams in each longitudinal direction. The collimated beams impinge on sloping faces of a refractor to diverge the beams into a regular pattern covering the street with a sharp cutoff at predetermined longitudinal distances from the luminaire. The refractor employs a compressed parabola comprised of radial sections of comparatively large focal length with steps and risers. The complex shape of the one-piece reflector may readily be produced by a reflector finish applied to a molded plastic matrix. In the luminaire, the prismatic surfaces of the inclined walls of the refractor diverge the formerly collimated beams in a carefully controlled manner to produce very uniform distribution of light.
A luminaire adapted for mounting above a roadway to illuminate the roadway, the luminaire comprising:
A luminaire for mounting above residential roadway for illuminating said roadway, said luminaire comprising a one-piece reflector comprised of a plurality of arcuate reflective surfaces offset from one another for producing a plurality of collimated beams in each direction longitudinal to the roadway and, at least one beam for each direction lateral to said roadway, and an essentially rectangular refractor having inclined flat sidewalls with patterns of repetitive identical prisms configured to spread and direct said beams in a pattern resulting in uniform light intensity on said roadway and subduing the beams asymmetrically lateral to the roadway.
A luminaire adapted to be mounted adjacent the side of a roadway at a position spaced above said roadway, said luminaire comprising a light source, a reflector and a refractor, said reflector positioned above the light source with reflector walls spaced from the light source on longitudinal and transverse sides of said light source, said reflector comprised of a plurality of arcuate reflective surfaces about a domed central portion for producing a plurality of high intensity collimated beams longitudinally of said light source, said reflector comprising a stepped parabola in its optical characteristics, said refractor positioned beneath the center of said light source and enclosing the volume formed by the reflector, said refractor comprising flat inclined walls including a series of repetitive prisms on the walls of said refractor to receive and distribute the beams from the light source and refractor into a uniform illuminating distribution.
Dependencies are inferred from the claim text.