LED Device for Wide Beam Generation
First Claim
1. An apparatus for illuminating a selected surface comprising:
- a light source having at least one centerline; and
a lens optically coupled to the light source, wherein the lens primarily refracts light collected from the light source into an azimuthally asymmetric illumination pattern having more than one director of principal candela off the centerline so that the maximum candela is off the centerline.
1 Assignment
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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.
33 Citations
20 Claims
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1. An apparatus for illuminating a selected surface comprising:
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a light source having at least one centerline; and a lens optically coupled to the light source, wherein the lens primarily refracts light collected from the light source into an azimuthally asymmetric illumination pattern having more than one director of principal candela off the centerline so that the maximum candela is off the centerline. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a light source with a radiation pattern having a centerline; and an azimuthally asymmetric lens optically coupled to the light source; having an outer surface with more than one azimuthally asymmetric refracting lobe contiguous with the outer surface of the lens; and having a concave outer surface shape on the centerline. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for illuminating a selected surface comprising:
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a light source with a radiation pattern having at least one centerline; and a lens optically coupled to the light source, wherein the lens primarily refracts light collected from the light source into an azimuthally asymmetric illumination pattern having at least one director of principal candela at least 15 degrees off the centerline on the selected surface so that the maximum candela is at least 15 degrees off the centerline.
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Specification