Light fixture having a multilayer polymeric film
First Claim
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1. A light fixture comprising:
- (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 alternating layers of at least a first layer type comprising a first polymeric material and a second layer type comprising a second polymeric material, wherein a difference in indices of refraction between the two layer types is Δ
x along a first in-plane axis, Δ
y along a second in-plane axis perpendicular to the first in-plane axis, and Δ
z along a third axis mutually orthogonal to the first and second axes, and wherein |Δ
z| is less than about 0.5k, where k is the larger of |Δ
x| and |Δ
y|.
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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.
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Citations
9 Claims
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1. 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 alternating layers of at least a first layer type comprising a first polymeric material and a second layer type comprising a second polymeric material, wherein a difference in indices of refraction between the two layer types is Δ
x along a first in-plane axis, Δ
y along a second in-plane axis perpendicular to the first in-plane axis, and Δ
z along a third axis mutually orthogonal to the first and second axes, and wherein |Δ
z| is less than about 0.5k, where k is the larger of |Δ
x| and |Δ
y|.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification