Optics for chip-on-board road and area lighting
AssigneeBridgelux, Inc.
InventorsXiaolu Chen, Wenhui Zhang, Scott West
Life of this patent
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Abstract
A lamp includes an extended planar light source, and an optical element arranged with the light source, wherein the optical element comprises an outer surface having an indented cusp substantially over the light source. A lamp includes an extended planar light source, and an optical element arranged with the light source, wherein the optical element comprises an outer surface having a portion at a peripheral edge comprising a curvature configured to redirect light emitted from the light source by total internal reflection.
Claims19
A lens for a light source comprising:
- an outer surface that is asymmetric in a first plane and that is symmetric relative to a second plane that is perpendicular to the first plane and comprises at least one of a refractive, diffractive, prismatic, or scattering feature which is asymmetric in the first plane and is symmetric relative to the second plane;
- and
- an indented cusp disposed at an intersection of the respective planes of the outer surface, with the indented cusp forming an indented cone and being symmetrical about a plane that runs through a single point of the indented cusp.
A lens for a light source comprising:
- a curved outer surface that is asymmetric with respect to a plane in a first direction and that is symmetric with respect to a plane in a second direction that intersects the first direction and comprises at least one of a refractive, diffractive, prismatic, or scattering feature which is asymmetric in the first plane and is symmetric relative to the second plane;
- and
- an indented cusp disposed in the outer surface where both planes intersect, with the indented cusp forming an indented cone with a circular outer boundary, wherein the indented cusp is symmetrical about a plane that runs through a single point of the indented cusp, and
- wherein the indented cusp is constructed as an origin from which a plurality of loci define a surface curvature of the curved outer surface that diverge outward.
A luminaire optical assembly emitting light in a directed beam pattern comprising:
- a pole;
- a boom extending from the pole;
- a lamp supported at an end of the boom comprising:
- a light source;
- and
- a lens including:
- a curved outer surface that is asymmetric with respect to a plane in a first direction and that is symmetric with respect to a plane in a second direction that intersects the first direction and comprises at least one of a refractive, diffractive, prismatic, or scattering feature which is asymmetric in the first plane and is symmetric relative to the second plane;
- and
- an indented cusp disposed in the outer surface where both planes intersect, with the indented cusp forming an indented cone with a circular outer boundary,
- wherein the indented cusp is symmetrical about a plane that runs through a single point of the indented cusp, and
- wherein the indented cusp is constructed as an origin from which a plurality of loci define a surface curvature of the curved outer surface that diverge outward.
Dependencies are inferred from the claim text.