Elongated LED Lighting Arrangement
First Claim
1. An elongated LED lighting arrangement, comprising:
- a) an elongated light pipe extending between first and second ends;
the light pipe having a sidewall between said ends facing outwardly of the light pipe;
the light pipe comprising homogeneous optical material between said ends,b) a first LED light source comprising at least one LED tuned to efficiently provide to the light pipe, via said first end, light within a first wavelength band;
c) a first dichroic mirror interposed between the first LED light source and said first end;
the mirror tuned to pass more than 90 percent of light within said first wavelength band from said first LED light source into the light pipe via said first end;
d) down-converting means on said sidewall tuned to efficiently absorb light rays from said first LED light source within a wavelength range that includes at least 80 percent of said first wavelength range and to emit lower-energy light rays outside of the light pipe at respectively higher wavelengths;
e) light-extracting means on said sidewall for extracting from the light pipe some light rays within said first wavelength band without changing the wavelengths of the foregoing light;
f) the down-converting means and the light-extracting means being arranged so that the light emitted by the down-converting means and the light extracted from the light pipe by the light-extracting means intermix to produce light, the majority of which has a composite color determined by the foregoing light emitted and the foregoing light extracted; and
g) the first dichroic mirror receiving some light emitted by the down-converting means and reflecting back into the light pipe more than 80 percent of the light received by the mirror, so that the reflected light can be extracted from the side of the light pipe by the light-extracting means.
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Accused Products
Abstract
An elongated LED lighting arrangement comprises an elongated light pipe with homogeneous optical material between first and second ends. In an exemplary embodiment, an LED provides blue light to the light pipe via a first dichroic mirror tuned to pass blue light. Down-converting means on sidewall of the light pipe, tuned to receive blue light, absorbs blue light from the LED and to emit lower-energy light outside of the light pipe at respectively higher wavelengths. Light-extracting means on the sidewall extract from the light pipe some blue light without changing the wavelengths of the foregoing light. Light from the down-converting means and the light-extracting means are combined to provide a composite color. The first dichroic mirror receives some light emitted by the down-converting means and reflects back into the light pipe more than 80 percent of the light received by the mirror.
165 Citations
19 Claims
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1. An elongated LED lighting arrangement, comprising:
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a) an elongated light pipe extending between first and second ends;
the light pipe having a sidewall between said ends facing outwardly of the light pipe;
the light pipe comprising homogeneous optical material between said ends,b) a first LED light source comprising at least one LED tuned to efficiently provide to the light pipe, via said first end, light within a first wavelength band; c) a first dichroic mirror interposed between the first LED light source and said first end;
the mirror tuned to pass more than 90 percent of light within said first wavelength band from said first LED light source into the light pipe via said first end;d) down-converting means on said sidewall tuned to efficiently absorb light rays from said first LED light source within a wavelength range that includes at least 80 percent of said first wavelength range and to emit lower-energy light rays outside of the light pipe at respectively higher wavelengths; e) light-extracting means on said sidewall for extracting from the light pipe some light rays within said first wavelength band without changing the wavelengths of the foregoing light; f) the down-converting means and the light-extracting means being arranged so that the light emitted by the down-converting means and the light extracted from the light pipe by the light-extracting means intermix to produce light, the majority of which has a composite color determined by the foregoing light emitted and the foregoing light extracted; and g) the first dichroic mirror receiving some light emitted by the down-converting means and reflecting back into the light pipe more than 80 percent of the light received by the mirror, so that the reflected light can be extracted from the side of the light pipe by the light-extracting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An elongated LED lighting arrangement, comprising:
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a) an elongated light pipe extending between first and second ends;
the light pipe having a sidewall between said ends facing outwardly of the light pipe;
the light pipe comprising homogeneous optical material between said ends,b) a first LED light source comprising at least one LED tuned to efficiently provide to the light pipe, via said first end, light within a first wavelength band; c) a first dichroic mirror interposed between the first LED light source and said first end;
the mirror tuned to pass more than 90 percent of light within said first wavelength band from said first LED light source into the light pipe via said first end;d) a second LED light source comprising at least one LED tuned to efficiently provide to the light pipe, via said second end, light within a second wavelength band; e) a second dichroic mirror interposed between the second LED light source and said second end;
the mirror tuned to pass more than 90 percent of light within said second wavelength band from said second LED light source into the light pipe via said second end;f) the first and second wavelength bands overlapping each other less than 10 percent; and g) light-extracting means on said sidewall for extracting from the light pipe light within said first and second wavelength bands without changing the wavelengths of the foregoing light. - View Dependent Claims (18, 19)
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Specification