LED device for wide beam generation
DCFirst Claim
1. An illumination system comprising:
- a light emitting diode having an optical axis disposed in a plane; and
an optic comprising a first lobe and a second lobe,wherein the optic is oriented with respect to the light emitting diode such that the first lobe is on a first side of the plane and the second lobe is on the second side of the plane,wherein the optic is operable to receive light emitted by the light emitting diode and is operable to form the received light into a three-dimensional distribution of light that the plane intersects, andwherein intensity of the three-dimensional distribution of light at the plane intersection comprises;
a first peak in intensity disposed on a first side of the optical axis; and
a second peak in intensity disposed on a second side of the optical axis.
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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.
156 Citations
20 Claims
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1. An illumination system comprising:
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a light emitting diode having an optical axis disposed in a plane; and an optic comprising a first lobe and a second lobe, wherein the optic is oriented with respect to the light emitting diode such that the first lobe is on a first side of the plane and the second lobe is on the second side of the plane, wherein the optic is operable to receive light emitted by the light emitting diode and is operable to form the received light into a three-dimensional distribution of light that the plane intersects, and wherein intensity of the three-dimensional distribution of light at the plane intersection comprises; a first peak in intensity disposed on a first side of the optical axis; and a second peak in intensity disposed on a second side of the optical axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An illumination system comprising:
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an optic comprising; a centerline; a first lobe on a first side of the centerline; and a second lobe on a second side of the centerline; and an LED mounted between the optic and a substrate, wherein an axis of the LED is oriented substantially normal to the substrate, the axis projecting through the optic, wherein the substrate defines a plane, and wherein the optic is operable to convert light from the LED into a three-dimensional energy distribution comprising a peak in candela at an angle that is between the axis and the plane. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An illumination system comprising:
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an LED having an axis, wherein a first plane comprises the axis, wherein a second plane comprises the axis, and wherein the first plane is perpendicular to the second plane; and an optic that is configured to receive light from the LED and to produce from the received light a three-dimensional intensity distribution, wherein a polar iso-candela plot of the three-dimensional intensity distribution for the first plane comprises; a first quadrant; a second quadrant adjacent and clockwise the first quadrant; a third quadrant adjacent and clockwise the second quadrant; a fourth quadrant adjacent and clockwise the third quadrant, wherein the axis extends between the second and third quadrants; a first peak in the second quadrant; and a second peak in the third quadrant, wherein a polar iso-candela plot of the three-dimensional intensity distribution for the second plane comprises; a fifth quadrant; a sixth quadrant adjacent and clockwise the fifth quadrant; a seventh quadrant adjacent and clockwise the sixth quadrant; an eighth quadrant adjacent and clockwise the seventh quadrant, wherein the axis extends between the sixth and seventh quadrants; a third peak in the sixth quadrant; and a fourth peak in the seventh quadrant. - View Dependent Claims (18, 19, 20)
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Specification