FLUORESCENT LIGHT SOURCE HAVING LIGHT RECYCLING MEANS
First Claim
1. A light guide comprising:
- a material capable of emitting light of a second wavelength when illuminated with light of a first wavelength different from the second wavelength; and
an exit face having a first portion reflective at the second wavelength and a second portion transmissive at the second wavelength,such that when the light guide is illuminated with light of the first wavelength, the material converts at least a portion of the light of the first wavelength into light of the second wavelength, wherein the majority of the light of the second wavelength that exits the second portion of the exit face is totally internally reflected by the light guide.
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Accused Products
Abstract
A light guide and a projection system incorporating same are disclosed. The light guide includes a material that is capable of emitting light of a second wavelength when illuminated with light of a first wavelength where the first wavelength is different from the second wavelength. The light guide further includes an exit face that has a first portion that is reflective at the second wavelength and a second portion that is transmissive at the second wavelength. When the light guide is illuminated with light of the first wavelength, the material converts at least a portion of the light of the first wavelength into light of the second wavelength. The majority of the light of the second wavelength that exits the second portion of the exit face is totally internally reflected by the light guide.
98 Citations
19 Claims
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1. A light guide comprising:
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a material capable of emitting light of a second wavelength when illuminated with light of a first wavelength different from the second wavelength; and an exit face having a first portion reflective at the second wavelength and a second portion transmissive at the second wavelength, such that when the light guide is illuminated with light of the first wavelength, the material converts at least a portion of the light of the first wavelength into light of the second wavelength, wherein the majority of the light of the second wavelength that exits the second portion of the exit face is totally internally reflected by the light guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A light guide comprising:
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a material capable of emitting light of a second wavelength when illuminated by light of a first wavelength different from the second wavelength; and an exterior surface that includes an exit face, the exit face having a first portion reflective at the second wavelength and a second portion transmissive at the second wavelength, the exterior surface having an optically transmissive portion having a first area and an optically reflective portion having a second area, the first area being substantially larger than the second area, wherein illumination of the transmissive portion of the exterior surface with light of the first wavelength causes the material to convert at least a portion of the light of the first wavelength into light of the second wavelength, at least a portion of the light of the second wavelength exiting the transmissive portion of the exit face. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification