SOLID STATE LIGHTING WITH SELECTIVE MATCHING OF INDEX OF REFRACTION
First Claim
1. A solid state lighting device, comprising:
- a plurality of solid state light emitters, each configured for emitting light in a predetermined spectrum;
an optic for combining light received from the plurality of solid state light emitters to form output light of the device,wherein at least a portion of the optic for receiving light from the plurality of solid state light emitters is formed of a light transmissive solid having an index of refraction; and
an index matching material for matching the index of refraction of the light transmissive solid, in an optical path between a light emission output of at least one first solid state light emitter and each surface of the light transmissive solid arranged to receive light from the at least one first solid state light emitter,wherein at least one second solid state light emitter is coupled to supply light to the light transmissive solid without any index matching material in an optical path between a light emission output of the at least one second solid state light emitter and each surface of the light transmissive solid arranged to receive light from the at least one second solid state light emitter.
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Accused Products
Abstract
Where a lighting device uses solid state emitters and an optic processes light from the emitters, it may improve efficiency in light extraction from the emitters to have an index of refraction matching material in between emitter output and a surface of solid of the optic that receives emitted light. However, such improved out-coupling or extraction efficiency may cause an overall color shift in the output of the overall lighting device, for example, if improved emitter output reduces internal reflection and associated internal phosphor excitation. To reduce the color shift in the output of the lighting device, the device may have index matching material used in association with one or some of the solid state light emitters but not all of the emitters, so that the combined light output of the device exhibits a desired spectral characteristics, e.g. remains a desirable color of white light.
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Citations
26 Claims
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1. A solid state lighting device, comprising:
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a plurality of solid state light emitters, each configured for emitting light in a predetermined spectrum; an optic for combining light received from the plurality of solid state light emitters to form output light of the device, wherein at least a portion of the optic for receiving light from the plurality of solid state light emitters is formed of a light transmissive solid having an index of refraction; and an index matching material for matching the index of refraction of the light transmissive solid, in an optical path between a light emission output of at least one first solid state light emitter and each surface of the light transmissive solid arranged to receive light from the at least one first solid state light emitter, wherein at least one second solid state light emitter is coupled to supply light to the light transmissive solid without any index matching material in an optical path between a light emission output of the at least one second solid state light emitter and each surface of the light transmissive solid arranged to receive light from the at least one second solid state light emitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A lighting arrangement comprising:
a plurality of solid state light emitters on a circuit board, the plurality of solid state emitters comprising; at least one first solid state light emitter comprising a first light source, a first cover portion through which light emitted from the light source is transmitted, and an index matching material in an optical path between the first light source and the first cover portion; and at least one second solid state light emitter comprising a second light source, a second cover portion through which light emitted from the second light source is transmitted, and without the index matching material in the optical path between the second light source and the second cover portion. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
Specification