LED device for wide beam generation
First Claim
1. An apparatus comprising a two-dimensional array of light sources, each light source comprising:
- a respective LED comprising a substrate; and
a respective lens coupled to the respective LED and operative to transform a substantially Lambertian output into a light distribution that spreads about an axis,wherein the axis is substantially perpendicular to the substrate,wherein a polar candela plot of the light distribution comprises a first peak and a second peak that are disposed at substantially opposing angles relative to a line on the polar candela plot that corresponds substantially to the axis, andwherein the respective lens comprises an indentation that is disposed entirely on one side of the axis and that divides an outer surface of the respective lens into two subsurfaces.
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Accused Products
Abstract
An apparatus and method is characterized by providing an optical transfer function between a predetermined illuminated surface pattern, such as a street light pattern, and a predetermined energy distribution pattern of a light source, such as that from an LED. A lens is formed having a shape defined by the optical transfer function. The optical transfer function is derived by generating an energy distribution pattern using the predetermined energy distribution pattern of the light source. Then the projection of the energy distribution pattern onto the illuminated surface is generated. The projection is then compared to the predetermined illuminated surface pattern to determine if it acceptably matches. The process continues reiteratively until an acceptable match is achieved. Alternatively, the lens shape is numerically or analytically determined by a functional relationship between the shape and the predetermined illuminated surface pattern and predetermined energy distribution pattern of a light source as inputs.
134 Citations
20 Claims
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1. An apparatus comprising a two-dimensional array of light sources, each light source comprising:
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a respective LED comprising a substrate; and a respective lens coupled to the respective LED and operative to transform a substantially Lambertian output into a light distribution that spreads about an axis, wherein the axis is substantially perpendicular to the substrate, wherein a polar candela plot of the light distribution comprises a first peak and a second peak that are disposed at substantially opposing angles relative to a line on the polar candela plot that corresponds substantially to the axis, and wherein the respective lens comprises an indentation that is disposed entirely on one side of the axis and that divides an outer surface of the respective lens into two subsurfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light module comprising a plurality of light sources arranged on a substrate, each light source comprising:
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at least one light emitting diode comprising a substrate; and a lens coupled to the at least one light emitting diode and operative to distribute light along an axis that is orthogonal to the substrate, wherein the axis lies in a plane that extends between two subsurfaces of the lens, wherein the lens comprises an indentation that extends between the two subsurfaces and that is offset from the axis, wherein a polar candela plot of the distributed light comprises two polar regions of elevated intensity exhibiting substantial mirror image symmetry with respect to one another, and wherein approximately zero degrees on the polar candela plot represents the axis. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A light module comprising a plurality of light sources arranged on a substrate, each light source comprising:
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at least one light emitting diode; and a lens coupled to the at least one light emitting diode and operative to distribute light along an axis that is perpendicular to the substrate, wherein the lens comprises; a plane of symmetry that comprises the axis, wherein a second plane is perpendicular to the plane of symmetry, is perpendicular to the substrate, and comprises the axis; and a surface region disposed at a location that is offset from the second plane, the surface region comprising an indentation disposed at an intersection between the plane of symmetry and the surface region, wherein a polar candela plot of the distributed light comprises two polar regions of elevated intensity exhibiting substantial mirror image symmetry with respect to one another, and wherein approximately zero degrees on the polar candela plot represents the axis. - View Dependent Claims (20)
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Specification