LED device for wide beam generation
First Claim
1. A street luminaire comprising:
- a fixture operable to position a plurality of light modules overhead relative to a street to be illuminated; and
the plurality of light modules, each light module comprising;
a planar substrate; and
a number of light sources arranged in a two-dimensional array and mounted to the planar substrate, each light source comprising;
at least one light emitting diode; and
a lens mounted to accept light from the at least one light emitting diode,wherein the lens exhibits symmetry with respect to a first reference plane that extends through the lens and the planar substrate,wherein a second reference plane extends through the planar substrate and the lens and is perpendicular to the first reference plane,wherein the lens comprises a feature that is disposed on a first side of the second reference plane, andwherein the feature is operative to receive light propagating on the first side of the second reference plane and to redirect said received light through the second reference plane for propagation on a second side of the second reference plane so that the each light source outputs a respective pattern of light that is biased street side relative to curbside and that has a respective intensity,wherein each light module is operative to produce a pattern of light substantially matching said respective pattern of light with an intensity that is substantially equal to said respective intensity multiplied by the number.
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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.
192 Citations
20 Claims
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1. A street luminaire comprising:
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a fixture operable to position a plurality of light modules overhead relative to a street to be illuminated; and the plurality of light modules, each light module comprising; a planar substrate; and a number of light sources arranged in a two-dimensional array and mounted to the planar substrate, each light source comprising; at least one light emitting diode; and a lens mounted to accept light from the at least one light emitting diode, wherein the lens exhibits symmetry with respect to a first reference plane that extends through the lens and the planar substrate, wherein a second reference plane extends through the planar substrate and the lens and is perpendicular to the first reference plane, wherein the lens comprises a feature that is disposed on a first side of the second reference plane, and wherein the feature is operative to receive light propagating on the first side of the second reference plane and to redirect said received light through the second reference plane for propagation on a second side of the second reference plane so that the each light source outputs a respective pattern of light that is biased street side relative to curbside and that has a respective intensity, wherein each light module is operative to produce a pattern of light substantially matching said respective pattern of light with an intensity that is substantially equal to said respective intensity multiplied by the number. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A street luminaire comprising:
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a plurality of light modules; and a fixture that is operable to position the plurality of light modules for illuminating a street that extends in a direction, wherein each light module comprises; a substrate; and a number of light sources disposed along the substrate to form an array of light sources having a substantially planar format, each light source comprising; a respective lens; and at least one respective light emitting diode coupled to the respective lens, wherein the respective lens is intersected by a plane that extends in the direction, the plane having a street side and a curbside, and wherein a jutting portion of the respective lens is disposed on a curbside of the plane and is operative to receive light from the at least one respective light emitting diode that is headed curbside and to reflect said received light to pass through the plane, so that the respective lens produces an illumination pattern of an intensity, the illumination pattern biased street side relative to curbside, and wherein each light module produces the illumination pattern of a second intensity that is approximately equal to the intensity multiplied by the number. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A street luminaire comprising:
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a first number of light modules, each operable to produce an illumination pattern of a first intensity; and a fixture that is operable to mount and power the first number of light modules to produce the illumination pattern of a second intensity for illuminating a street, the second intensity substantially equaling the first intensity multiplied by the first number, wherein each light module comprises; a substantially flat substrate; and a second number of light sources arranged upon the substantially flat substrate, each light source comprising; at least one respective LED; and a respective lens comprising a first side that the fixture orients curbside and a second side that the fixture orients street side, wherein the first side of the respective lens and the second of the respective lens are optically different from one another, wherein the respective lens is mounted with the at least one respective LED such that the first side of the respective lens receives light from the at least one respective LED and the second side of the respective lens receives light from the at least one respective LED, wherein the first side of the respective lens is operable to send street side a substantial amount of the light that the first side of the respective lens receives, resulting in biasing the illumination pattern street side relative to curbside, and wherein the respective lens is operable to produce the illumination pattern of a third intensity, and the first intensity substantially equals the third intensity multiplied by the second number. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification