Illumination – Light source and modifier – Including reflector
Patent
1978-03-23
1980-10-28
Nelson, Peter A.
Illumination
Light source and modifier
Including reflector
362346, 362349, A47B 1900
Patent
active
042310806
ABSTRACT:
An optical louver luminaire having at least three stacked reflector members each of which is at least in part a surface of revolution, all centered on a common vertical axis. Each reflector has a central opening to receive a light source. The light source has a region of major luminance with an upper end and a lower end. The lower one of the reflector members cuts off light from the upper end of the region to determine the lower-most vertical angle of direct illumination, and others of the reflector members determine the cut-off angle of the greatest vertical angle. The optical luminaire casts a combination of doubly reflected and directly transmitted light to produce a light distribution on the ground with intensities that increase as the vertical angle increases to a pre-determined angle. If desired, parts of the reflector members may be replaced by asymmetrical reflector members to provide for asymmetrical light distribution.
REFERENCES:
patent: Re29017 (1976-10-01), Hildenbrandt
patent: 1876667 (1932-09-01), Gunnison
patent: 1881525 (1932-10-01), Halpern
patent: 2327219 (1943-08-01), Rowland
patent: 3215829 (1965-11-01), Collins et al.
patent: 3359415 (1967-12-01), Lasker
patent: 3593014 (1971-07-01), Vesely
patent: 3836767 (1974-09-01), Lasker
patent: 4096555 (1978-06-01), Lasker
Kim Lighting Inc.
Mon Donald D.
Nelson Peter A.
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