SOLID STATE LIGHT FIXTURE WITH A TUNABLE ANGULAR DISTRIBUTION
First Claim
1. A light fixture, comprising:
- a lens having a lateral area divided into a plurality of zones, each zone having a respective focal length;
a plurality of selectively electrically controllable light emitting diodes (LEDs) disposed longitudinally adjacent to the lens, the plurality of LEDs emitting light in essentially the same direction toward the lens with essentially the same spectral profile, each LED in the plurality emitting light that strikes one of the zones, each LED belonging to a subset of LEDs corresponding to the zone struck by its emitted light, each zone producing a transmitted beam having a respective angular beam width, the transmitted beams from the plurality of zones forming exiting light;
wherein at least two of the zones produce transmitted beams having different respective angular beam widths;
wherein each subset of LEDs is electrically controllable independent of the other subsets; and
wherein a variation in electrical power to one subset of LEDs relative to the other subsets of LEDs produces a change in the angular profile of the exiting light.
2 Assignments
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Accused Products
Abstract
A light fixture may include LEDs that each emits light into a particular zone on a lens, where each zone has its own focal properties. Each LED may be grouped into one (or more) subset(s) that corresponds to the zone(s) struck by its emitted light. The LEDs may be selectively electrically controllable, so that the amount of light transmitted through each zone may be controllable by the electrical control system of the fixture. Because light transmitted through different zones emerges from the fixture having different widths, the electrical control system can directly control the amount of light emerging at each width. By mixing relatively narrow light with relatively wide light in the proper proportions, the electrical control system of the fixture may produce light having any desired angular profile between “narrow” and “wide”. One may think of the fixture having a controller that features both a dimmer, which can control the optical power or brightness of the fixture 1, and a “width” controller, which can dial in values between “narrow” and “wide” light. By varying the relative contributions of the different beam widths, the angular profile of the total output may be varied, and may advantageously be varied electronically, without any moving parts.
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Citations
20 Claims
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1. A light fixture, comprising:
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a lens having a lateral area divided into a plurality of zones, each zone having a respective focal length; a plurality of selectively electrically controllable light emitting diodes (LEDs) disposed longitudinally adjacent to the lens, the plurality of LEDs emitting light in essentially the same direction toward the lens with essentially the same spectral profile, each LED in the plurality emitting light that strikes one of the zones, each LED belonging to a subset of LEDs corresponding to the zone struck by its emitted light, each zone producing a transmitted beam having a respective angular beam width, the transmitted beams from the plurality of zones forming exiting light; wherein at least two of the zones produce transmitted beams having different respective angular beam widths; wherein each subset of LEDs is electrically controllable independent of the other subsets; and wherein a variation in electrical power to one subset of LEDs relative to the other subsets of LEDs produces a change in the angular profile of the exiting light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light fixture, comprising:
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a plurality of selectively electrically controllable light emitting diodes (LEDs), the plurality of LEDs emitting light in essentially the same direction with essentially the same spectral profile; and a plurality of lenses corresponding to at least some of the plurality of LEDs; wherein each lens that receives emitted light from a corresponding LED produces a transmitted beam having one of a predetermined number of angular beam widths; wherein each LED that does not have a corresponding lens produces a transmitted beam having one of the predetermined number of angular beam widths; wherein the LEDs are grouped into mutually exclusive subsets by the respective angular beam width; wherein the transmitted beams form exiting light; wherein at least two of the transmitted beams have different angular beam widths; wherein each subset of LEDs is electrically controllable independent of the other subsets; and wherein a variation in electrical power to one subset of LEDs relative to the other subsets of LEDs produces a change in the angular profile of the exiting light. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for varying an angular distribution from a light fixture, comprising:
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providing a localized plurality of selectively electrically powered light emitting diodes (LEDs), the plurality of LEDs emitting light in essentially the same direction with essentially the same spectral profile, the light from each LED having one of a predetermined number of angular beam widths, the light from the plurality of LEDs forming exiting light; providing electrical power to a first subset of the plurality of LEDs, the first subset producing light having a first angular beam width; and varying the electrical power provided to a second subset of the plurality of LEDs, the second subset producing light having a second angular beam width different from the first angular beam width. - View Dependent Claims (19, 20)
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Specification