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US 7,841,748 B2Granted
Diffractor-diffuser system for a fluorescent lumen package
AssigneeRLR Industries, Inc.
InventorsDavid D. Rodstein, Stewart B. Lewis
Life of this patent
Estimating the term…
Abstract
The diffractor has a profile defined by first, second and third parabolic segments, and continuously tapering facets for improved lighting performance. Different diffuser geometries are provided to generate differing light distribution patterns, including a conical diffuser, and a diffuser having a fresnel lens portion and an angled flange portion. Equal numbers of facets and/or facets of similar geometrical profile may be provided on the diffuser and on the diffractor.
Claims53
A lighting diffractor-diffuser system comprising:
- a lighting diffractor comprising a light-transmissive shell having an inner surface and an outer surface, the shell having a cross-sectional profile comprising a first parabolic segment positioned toward a top portion of the diffractor, a second parabolic segment positioned at an intermediate portion of the diffractor, and a third parabolic segment positioned toward a lower rim portion of the diffractor;
- and
- a diffuser comprising a fresnel lens portion and an angled flange surrounding the fresnel lens portion, the angled flange of the diffuser being attached to the lower rim portion of the diffractor;
- wherein the angled flange comprises a plurality of longitudinal facets, each of said longitudinal facets having an included angle of between 70°-90°.
1 more element
A lighting diffractor-diffuser system comprising:
- a lighting diffractor comprising a light-transmissive shell having an inner surface and an outer surface, the shell having a cross-sectional profile comprising a first parabolic segment positioned toward a top portion of the diffractor, a second parabolic segment positioned at an intermediate portion of the diffractor, and a third parabolic segment positioned toward a lower rim portion of the diffractor;
- and
- a diffuser comprising a fresnel lens portion and an angled flange surrounding the fresnel lens portion, the angled flange of the diffuser being attached to the lower rim portion of the diffractor;
- wherein the angled flange comprises a plurality of longitudinal facets, each of said longitudinal facets having an included angle of about 81°.
1 more element
A lighting diffractor-diffuser system comprising:
- a lighting diffractor comprising a light-transmissive shell having an inner surface and an outer surface, the shell having a cross-sectional profile comprising a first parabolic segment positioned toward a top portion of the diffractor, a second parabolic segment positioned at an intermediate portion of the diffractor, and a third parabolic segment positioned toward a lower rim portion of the diffractor;
- and
- a diffuser comprising a fresnel lens portion and an angled flange surrounding the fresnel lens portion, the angled flange of the diffuser being attached to the lower rim portion of the diffractor;
- wherein the outer surface of the shell comprises a number of facets, and wherein the outer surface of the angled flange comprises an equal number of facets.
1 more element
A lighting diffractor-diffuser system comprising:
- a lighting diffractor comprising a light-transmissive shell having an inner surface and an outer surface, the shell having a cross-sectional profile comprising a first parabolic segment positioned toward a top portion of the diffractor, a second parabolic segment positioned at an intermediate portion of the diffractor, and a third parabolic segment positioned toward a lower rim portion of the diffractor;
- and
- a cone-shaped diffuser attached to the lower rim portion of the diffractor;
- wherein the cone-shaped diffuser comprises a plurality of concentric ring prismatic facets, each of said plurality of concentric ring prismatic facets having an included angle of between 120° to 150°.
1 more element
A lighting diffractor-diffuser system comprising:
- a lighting diffractor comprising a light-transmissive shell having an inner surface and an outer surface, the shell having a cross-sectional profile comprising a first parabolic segment positioned toward a top portion of the diffractor, a second parabolic segment positioned at an intermediate portion of the diffractor, and a third parabolic segment positioned toward a lower rim portion of the diffractor;
- and
- a cone-shaped diffuser attached to the lower rim portion of the diffractor;
- wherein the cone-shaped diffuser comprises a plurality of concentric ring prismatic facets, each of said plurality of concentric ring prismatic facets having an included angle of about 135°.
1 more element
Dependencies are inferred from the claim text.