Illumination – Light modifier – Reflector
Patent
1980-06-16
1982-11-23
Nelson, Peter A.
Illumination
Light modifier
Reflector
362217, 362297, 362348, 362375, F21V 709
Patent
active
043608639
ABSTRACT:
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.
REFERENCES:
patent: 2686255 (1954-08-01), Pascucci
patent: 3896302 (1973-10-01), Whitney
patent: 4210841 (1980-07-01), Vodicka et al.
Barnes Jocelyn T.
Hard, III Chester A.
Loch Charles H.
Shelby Billy L.
Chaban Marvin M.
International Telephone and Telegraph Corporation
Nelson Peter A.
Raden James B.
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