Optical integrating chamber lighting using multiple color sources
First Claim
1. A lighting system, comprising:
- a dome having a reflective surface; and
a plate having a substantially flat reflective surface facing the reflective surface of the dome, coupled to the dome so as to form a reflective chamber between the reflective surfaces of the dome and plate,at least a portion of one of the reflective surfaces of the dome and plate being diffusely reflective;
an aperture for emission of light from the chamber;
a plurality of light emitting diodes (LEDs), each respective one of the LEDs being coupled to emit light into the chamber in a direction toward a reflective surface of the dome or plate so that light emissions from the respective LED reflect at least once within the chamber before emission through the aperture,wherein reflections of light from the LEDs within the chamber combines light from the LEDs for the emission through the aperture toward a region intended for humanly perceptible lighting by emitted combined light.
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Accused Products
Abstract
A system to provide radiant energy of selectable spectral characteristic (e.g. a selectable color combination of light) uses an optical integrating cavity to combine energy of different wavelengths from different sources. Sources of radiant energy of different wavelengths, typically different-color LEDs, supply radiant energy into the interior of the cavity. The cavity has a diffusely reflective interior surface and an aperture for allowing emission of combined radiant energy. Control of the intensity of emission of the sources sets the amount of each wavelength of energy in the combined output and thus determines a spectral characteristic of the radiant energy output through the aperture. A variety of different elements may optically process the combined light output, such a deflector, a variable iris, a lens, a variable focusing lens system, a collimator, a holographic diffuser and combinations thereof. Such systems are useful in various luminous applications as well as various illumination applications.
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Citations
32 Claims
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1. A lighting system, comprising:
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a dome having a reflective surface; and a plate having a substantially flat reflective surface facing the reflective surface of the dome, coupled to the dome so as to form a reflective chamber between the reflective surfaces of the dome and plate, at least a portion of one of the reflective surfaces of the dome and plate being diffusely reflective; an aperture for emission of light from the chamber; a plurality of light emitting diodes (LEDs), each respective one of the LEDs being coupled to emit light into the chamber in a direction toward a reflective surface of the dome or plate so that light emissions from the respective LED reflect at least once within the chamber before emission through the aperture, wherein reflections of light from the LEDs within the chamber combines light from the LEDs for the emission through the aperture toward a region intended for humanly perceptible lighting by emitted combined light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A down light, comprising:
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a dome having a reflective surface facing downward; a plate extending across an open area of the surface of the dome and having a substantially flat reflective surface facing toward the reflective surface of the dome; wherein the reflective surfaces of the dome and plate form a chamber therebetween; an aperture extending downward through the plate; a plurality of light emitting diodes coupled to emit light from points on the reflective surface of the plate toward the reflective surface of the dome; wherein at least a portion of one of the reflective surfaces has a diffuse reflectively such that reflections within the chamber combine light from the LEDs for combined light emission downward through the aperture. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system providing down lighting, comprising:
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a dome having a diffusely reflective surface facing downward, the diffusely reflective surface of the dome having a shape corresponding to a substantial segment of a sphere; a plate extending across an circular open area of the surface of the dome and having a substantially flat diffusely reflective circular surface facing toward the reflective surface of the dome; wherein the reflective surfaces of the dome and plate form a chamber therebetween; an aperture extending downward through the plate; a plurality of light emitting diodes coupled to emit light from points on the circular reflective surface of the plate upward into the chamber toward the reflective surface of the dome; wherein reflections within the chamber combine light from the LEDs for combined light emission downward through the aperture; control circuitry coupled to first and second ones of the LEDs emitting lights of different colors for establishing respective amounts of light outputs from the first and second LEDs, so as to set a color characteristic of the combined light emitted through the aperture; and a white light source supplying white light to the chamber, the white light source being arranged so that at least a substantial portion of the white light from the white light source passes directly through the aperture.
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Specification