LED DEVICE FOR WIDE BEAM GENERATION
4 Assignments
0 Petitions
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.
149 Citations
52 Claims
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1-39. -39. (canceled)
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40. An array for providing illumination comprising:
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a plurality of light emitting devices for providing a predetermined illuminated surface pattern, each device having an substantially identical energy distribution pattern which produces the predetermined illuminated surface pattern; a circuit driver coupled to each of the devices; and a planar carrier in which the plurality of light emitting devices are arranged to provide a spatially organization of the array to collectively produce a linearly additive illumination pattern matching the predetermined illuminated surface pattern. - View Dependent Claims (41, 42, 43, 44, 45)
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46. A luminaire for a street light comprising:
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a lighting fixture; and a plurality of arrays of light emitting devices disposed in the lighting fixture, each array for providing an illumination pattern on the street surface, each device having an identical energy distribution pattern which produces the illuminated surface pattern; a circuit driver coupled to each of the devices; and a planar carrier in which the plurality of light emitting devices are arranged to provide a spatially organization of the array to collectively produce a linearly additive illumination pattern matching the illuminated surface pattern.
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47. A luminaire for a street light to provide a predetermined illumination pattern, the predetermined illumination pattern having a defined horizon, comprising:
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a lighting fixture; and a plurality of planar arrays of light emitting devices disposed in the lighting fixture, each array for providing the predetermined illumination pattern with substantial reduction of light directed from the luminaire to the horizon or above.
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48. An array for providing illumination comprising:
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a plurality of light emitting devices for providing a predetermined illuminated surface pattern, each device having an corresponding energy distribution pattern which produces the corresponding predetermined illuminated surface pattern; a circuit driver coupled to each of the devices; and a planar carrier in which the plurality of light emitting devices are arranged to provide a spatial organization of the array, the planar array being oriented substantially parallel to the illuminated plane. - View Dependent Claims (49, 50)
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51. A method of providing an integral array for producing a predetermined illumination on a surface from a plurality of light sources, each light source having a predetermined radiation pattern, comprising:
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providing a shaped lens for each of the light sources having a shape defined by a reiteratively determined transfer function which generates an energy distribution pattern from the predetermined radiation pattern of the light source resulting in the predetermined illuminated pattern on the surface; and assembling the plurality of light sources optically each combined with the shaped lens into a modular light bar. - View Dependent Claims (52)
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Specification