Integrating chamber cone light using LED sources
First Claim
1. An apparatus for emitting radiant energy, comprising:
- an integrating cavity, having a diffusely reflective interior surface and an aperture for allowing emission of combined radiant energy;
a plurality of sources of radiant energy coupled to supply radiant energy into the interior of the integrating cavity;
wherein each of the sources emits radiant energy of a different wavelength, and the combined radiant energy emitted through the aperture includes He radiant energy of the different wavelengths; and
control circuitry coupled to the sources for establishing output intensity of radiant energy of each of the sources to set a spectral characteristic of the combined radiant energy emitted through the aperture.
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Abstract
A system to provide radiant energy of selectable spectral characteristic (e.g. a selectable color combination) uses an integrating cavity to combine energy of different wavelengths from different sources. The cavity has a diffusely reflective interior surface and an aperture for allowing emission of combined radiant energy. Sources of radiant energy of different wavelengths, typically different-color LEDs, supply radiant energy into the interior of the integrating cavity. In the examples, the points of entry of the energy into the cavity typically are located so that they are not directly visible through the aperture. The cavity effectively integrates the energy of different wavelengths, so that the combined radiant energy emitted through the aperture includes the radiant energy of the various wavelengths. The apparatus also includes a control circuit coupled to the sources for establishing output intensity of radiant energy of each of the sources. 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.
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Citations
35 Claims
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1. An apparatus for emitting radiant energy, comprising:
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an integrating cavity, having a diffusely reflective interior surface and an aperture for allowing emission of combined radiant energy;
a plurality of sources of radiant energy coupled to supply radiant energy into the interior of the integrating cavity;
wherein each of the sources emits radiant energy of a different wavelength, and the combined radiant energy emitted through the aperture includes He radiant energy of the different wavelengths; and
control circuitry coupled to the sources for establishing output intensity of radiant energy of each of the sources to set a spectral characteristic of the combined radiant energy emitted through the aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus for emitting radiant energy of multiple wavelengths comprising:
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a plurality of first light emitting diodes (LEDs) for emitting radiant energy of a first wavelength, at least one of the first LEDs being initially active and at least one other of the first LEDs being initially inactive;
a plurality of second LEDs for emitting radiant energy of a second wavelength different from the first wavelength, at least one of the second LEDs being initially active and at least one of the second LEDs being initially inactive;
a controller coupled to control operation of the first and second LEDs; and
a sensor arranged to sense at least one condition relating to operation of the apparatus, wherein the controller selectively activates one or more of the inactive LEDs in response to the condition sensed by the sensor. - View Dependent Claims (33, 34, 35)
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Specification