LED Device for Wide Beam Generation
First Claim
1. An improvement in a lens for use in an apparatus for providing a predetermined illuminated surface pattern from a predetermined energy distribution pattern of a light source, the improvement comprising an undercut surface defined on the lens, the lens having a base adjacent to the light source, having a lens axis and having a surface between the base and lens axis, the undercut surface extending from the base of the lens at least partially along the surface of the lens toward the lens axis, the undercut surface defining an energy distribution pattern using the predetermined energy distribution pattern of the light source and projecting the energy distribution pattern onto the illuminated surface, which projection acceptably matches the predetermined illuminated surface pattern.
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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.
98 Citations
8 Claims
- 1. An improvement in a lens for use in an apparatus for providing a predetermined illuminated surface pattern from a predetermined energy distribution pattern of a light source, the improvement comprising an undercut surface defined on the lens, the lens having a base adjacent to the light source, having a lens axis and having a surface between the base and lens axis, the undercut surface extending from the base of the lens at least partially along the surface of the lens toward the lens axis, the undercut surface defining an energy distribution pattern using the predetermined energy distribution pattern of the light source and projecting the energy distribution pattern onto the illuminated surface, which projection acceptably matches the predetermined illuminated surface pattern.
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4. An improvement in an apparatus for providing an optical transfer function between a predetermined illuminated surface pattern and a predetermined energy distribution pattern of a light source comprising an undercut surface of a lens having a shape defined by the optical transfer function which shape is derived by generating an energy distribution pattern using the predetermined energy distribution pattern of the light source and then generating a projection of the energy distribution pattern onto the illuminated surface from the energy distribution pattern, which projection acceptably matches the predetermined illuminated surface pattern.
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5. An apparatus comprising:
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a light source having a near field and at least a portion of light from the light source being transmitted into a peripheral forward solid angle; and a lens having an undercut surface and a lobed surface which includes at least one lobe contiguous with the lens, the undercut surface positioned to intercept light in the near field of the light source in the peripheral forward solid angle of light from the light source to direct the intercepted light. - View Dependent Claims (6, 7, 8)
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Specification