Illumination – Light source and modifier – Including reflector
Patent
1996-11-22
1998-09-08
Cariaso, Alan
Illumination
Light source and modifier
Including reflector
362 84, 362303, 362307, 362350, F21V 1310
Patent
active
058035923
ABSTRACT:
A Lambertian light source assembly has high uniformity, large size, and high brightness, typically having a non-uniformity about 10% or less (e.g. about 5%), and a surface brightness of at least about 2000 footlamberts. The assembly includes a light emitting element (such as a single arc lamp, e.g. a metal halide lamp), a first reflector having an interior diffuse reflective surface comprising a portion of a surface of revolution and a center axis, a second reflector, and a diffuser. The diffuser is connected to the first reflector. The light emitting element is substantially centrally located on the center axis, and the second reflector is located between the diffuser and the light emitting element and reduces the apparent surface brightness at the center of the first reflector and blocks the majority (e.g. all, or almost all except adjacent the first reflector) of direct illumination of the diffuser by the light emitting element. The surface of revolution has a radius R and the light emitting element is positioned on the center axis approximately 0.1 R from the first reflector interior surface, the second reflector is positioned approximately 0.2 R from the first reflector interior surface along the center axis, and the second reflector has a diameter, substantially perpendicular to the center axis, of approximately 0.3 R-0.4 R (e.g. 0.35 R). The first reflector interior surface may comprise integrating sphere paint, which may have pigments or phosphors for color correction.
REFERENCES:
patent: 1219583 (1917-03-01), Perry
patent: 1249133 (1917-12-01), Lebby
patent: 1279096 (1918-09-01), Fitz Gerald
patent: 1302492 (1919-05-01), Arenberg
patent: 1515221 (1924-11-01), Roberts et al.
patent: 1811782 (1931-06-01), Duncan, Jr.
patent: 4288844 (1981-09-01), Fisher et al.
patent: 4463410 (1984-07-01), Mori
patent: 4584631 (1986-04-01), Cody et al.
patent: 4706173 (1987-11-01), Hamada et al.
patent: 4731713 (1988-03-01), Perthus
patent: 5128848 (1992-07-01), Enders et al.
patent: 5479328 (1995-12-01), Lee et al.
patent: 5515255 (1996-05-01), Nielson et al.
patent: 5523930 (1996-06-01), Fritts
Austin Air Systems Limited
Cariaso Alan
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