Light fixture having a multilayer polymeric film
First Claim
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1. A light fixture, comprising:
- a light source; and
a multilayer polymeric film reflective polarizer positioned to transmit light of a desired polarization and to reflect light of another polarization back into the light source;
wherein at least one of the layers in said film comprises a first polymeric material and at least one of the layers in said film comprises a second polymeric material, wherein the difference in refractive indices between the first and second polymeric materials is less than about 0.05 along a first of three mutually perpendicular axes, wherein the difference in refractive indices between said first and second polymeric materials is at least about 0.05 along a second of said three mutually perpendicular axes, and wherein said first of said three mutually perpendicular axes is orthogonal to the surface of said film.
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Abstract
A polarized light source includes a diffuse light source and a reflective polarizing element placed proximate thereto. The reflective polarizing element transmits light of a desired polarization and reflects light of another polarization back into the diffuse source where it is randomized. Some of the initially rejected light is thus converted into the desired polarization and is transmitted through the reflective polarizing element. This process continues, and the repeated reflections and subsequent randomization of light of the undesired polarization increases the amount of light of the desired polarization that is emitted by the polarized light source.
241 Citations
45 Claims
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1. A light fixture, comprising:
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a light source; and a multilayer polymeric film reflective polarizer positioned to transmit light of a desired polarization and to reflect light of another polarization back into the light source; wherein at least one of the layers in said film comprises a first polymeric material and at least one of the layers in said film comprises a second polymeric material, wherein the difference in refractive indices between the first and second polymeric materials is less than about 0.05 along a first of three mutually perpendicular axes, wherein the difference in refractive indices between said first and second polymeric materials is at least about 0.05 along a second of said three mutually perpendicular axes, and wherein said first of said three mutually perpendicular axes is orthogonal to the surface of said film. - 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, 32, 33, 34, 35, 36, 37, 38)
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39. A light fixture comprising:
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(a) a light source (b) a multilayer mirror positioned to reflect light emitted by the light source toward an output side of the light fixture and (c) a reflective polarizer positioned to transmit light of a desired polarization, and to reflect light of another polarization back into the light source and the mirror, wherein the multilayer mirror comprises a polymeric film comprising a plurality of layers, wherein at least one of the layers comprises a first polymeric material and at least one of the layers comprises a second polymeric material, wherein a difference in refractive indices between the first and the second polymeric materials is less than about 0.05 along a first of three mutually perpendicular axes, wherein a difference in refractive indices between the first and second polymeric materials is at least about 0.05 along a second of the three mutually perpendicular axes, and wherein the first of the three mutually perpendicular axes is orthogonal to a plane of the film. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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Specification