LED device for wide beam generation
First Claim
1. A luminaire comprising:
- a substrate; and
an array of a number of light sources mounted to the substrate such that each light source is pointing in a same direction, each light source comprising;
a light emitting diode that has an axis; and
an optic that receives light from the light emitting diode and directs the received light to produce an illumination pattern that has a first intensity, wherein the optic comprises an inner hemispherical surface, the optic is symmetric with respect to a first reference plane passing through the axis, and the optic comprises a reflecting feature on a first side of a second reference plane, the second reference plane perpendicular to the first reference plane, wherein the reflecting feature reflects a portion of the light toward a second side of the second reference plane that is opposite the first side of the second reference plane,wherein the array of the number of light sources produces a scaled version of the illumination pattern with a second intensity that substantially equals to the first 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.
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Citations
20 Claims
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1. A luminaire comprising:
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a substrate; and an array of a number of light sources mounted to the substrate such that each light source is pointing in a same direction, each light source comprising; a light emitting diode that has an axis; and an optic that receives light from the light emitting diode and directs the received light to produce an illumination pattern that has a first intensity, wherein the optic comprises an inner hemispherical surface, the optic is symmetric with respect to a first reference plane passing through the axis, and the optic comprises a reflecting feature on a first side of a second reference plane, the second reference plane perpendicular to the first reference plane, wherein the reflecting feature reflects a portion of the light toward a second side of the second reference plane that is opposite the first side of the second reference plane, wherein the array of the number of light sources produces a scaled version of the illumination pattern with a second intensity that substantially equals to the first intensity multiplied by the number. - View Dependent Claims (2, 3, 4, 5)
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6. A luminaire comprising:
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a substrate configured for mounting above an area to be illuminated; and a plurality of light sources that are mounted to the substrate such that each light source is disposed at a same angle with respect to the substrate, each light source comprising; a light emitting diode; and an optic that receives light from the light emitting diode and directs the received light to produce an illumination pattern, wherein the optic comprises an inner hemispherical surface, the optic is symmetric with respect to a first reference plane, and the optic comprises a light redirecting feature on a first side of a second reference plane, the second reference plane perpendicular to the first reference plane, wherein the light redirecting feature redirects a portion of the light toward a second side of the second reference plane that is opposite the first side of the second reference plane. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A luminaire comprising:
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a substrate configured for mounting above an area to be illuminated; and a plurality of light sources that are mounted to the substrate at the same angle to the substrate and that collectively provide a collective beam pattern for illuminating the area, each of the light sources comprising; a light emitting diode; and an optic disposed adjacent the light emitting diode to form an individual beam pattern from light emitted by the light emitting diode, the optic comprising; a first surface defining a hemispherical cavity disposed to receive the light emitted by the light emitting diode; and a second surface that is disposed opposite the first surface and that is configured for creating asymmetry in the individual beam pattern. - View Dependent Claims (17, 18, 19, 20)
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Specification