Illumination – Light modifier – Reflector
Patent
1989-10-17
1991-05-07
Husar, Stephen F.
Illumination
Light modifier
Reflector
362297, 362350, F21V 704
Patent
active
050141759
ABSTRACT:
In this luminaire, there is a dome-shaped reflector having a top, a bottom, and a central axis on which a light source is adapted to be positioned. A metal wall of the reflector has an inner surface extending about the central axis and defining a bottom opening through which the inner surface reflects light received from the source. The angular distribution about the central axis of the light reflected from the inner surface through the bottom opening is controlled by many elongated facets on the inner surface extending in a top-to-bottom direction with respect to the reflector. The facets are arranged about the central axis in side-by-side relationship, with juxtaposed facets being at an angle with respect to each other so as to form alternating ridges and grooves between juxtaposed facets. The individual ridges, when viewed in transverse cross-section, each include two of the facets intersecting at an apex that is located on a reference line for each ridge extending radially outward from said central axis. The individual ridges that are located in predetermined sectors of the inner surface each have one of its two facets disposed at a much smaller angle with respect to its reference line than the other of the two facets so that this ridge is highly bilaterally asymmetrical with respect to said reference line.
REFERENCES:
patent: 1851916 (1932-03-01), MacDonald
patent: 3662165 (1972-05-01), Osteen et al.
patent: 4303971 (1981-12-01), Hogue et al.
patent: 4358816 (1982-11-01), Soileau
patent: 4864476 (1984-09-01), Lemons et al.
American Society of Metals Handbook, Article Entitled "Spinning", pp. 201-208, vol. 4, published by American Society of Metals, Cleveland, Ohio in 1967.
Drawing of reflector delivered by General Electric Co. to a purchaser prior to 1988.
Baldwin Samuel L.
Osteen Mitchell M.
Corwin Stanley C.
General Electric Company
Husar Stephen F.
Jacob Fred
McMahon John P.
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