Illumination – Elongated source light unit or support – With or including transparent or translucent member
Patent
1990-01-30
1991-05-21
Okonsky, David A.
Illumination
Elongated source light unit or support
With or including transparent or translucent member
362309, 362337, F21S 300
Patent
active
RE0335932
ABSTRACT:
A luminaire includes a source of light in an opaque housing which extends beneath the source and upwardly about the sides of the source to hide the source from direct view from a horizontal line of sight even with the source. A lens is mounted to the housing above the source and extending around to join with the upper edge of the housing. The lens includes an upper light-dispersing portion which diverges one portion and only displaces another portion of the light from the source to provide an even distribution of luminance to a ceiling above the source. The lens also includes a lateral light-bending portion which receives light from the source and fans it out laterally over the side of the housing to continue the uniform illumination pattern of the ceiling and to illuminate vertical surfaces in the vicinity of the luminaire. A reflector beneath the source directs light onto the lateral light-bending portion of the lens to at least partly compensate for the fact that the light passing through the lateral portion of the lens normally travels farther to the surface it is illuminating and also strikes any horizontal surface at an increased angle of incidence. The lens and housing cooperate to enclose the source of light to prevent dust from entering, and the lateral portion of the lens provides a visible source of light to a person in the room being illuminated.
REFERENCES:
patent: 2474341 (1949-06-01), Wince
patent: 3398273 (1968-08-01), Rex et al.
patent: 4001575 (1977-01-01), Sullivan et al.
patent: 4065667 (1977-12-01), Ruud et al.
patent: 4097918 (1978-06-01), Anderson et al.
patent: 4390930 (1983-06-01), Herst et al.
Peerless Electric Company, Photometric and Technical Information, Longlites by Peerless, 1977, pp. 82-95.
Electro-Systems, Inc., Power-Lume 800/1500, 1965, p. 5.
Holophane Company, Inc., Outdoor Substation Unit With Lens Top, D4252, 1966.
Holophane Company, Inc., Holophane 780, Expresslite.TM., (date unknown).
Herst Douglas J.
Ngai Peter Y. Y.
Beeson Donald L.
Okonsky David A.
Peerless Lighting Corporation
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