High efficiency optical devices
First Claim
1. An optical device comprising a body having at least two opposing optical surfaces, at least a portion of each of the optical surfaces comprising a reflective film that reflects incident light of at least one polarization orientation over an intended bandwidth,wherein the reflective film of each of the optical surfaces comprises a plurality of layers, wherein a refractive index difference between at least two adjacent layers in a first in-plane direction is greater than or equal to a refractive index difference between the at least two adjacent layers in a second in-plane direction for the reflective film, and further wherein the refractive index difference in the first in-plane direction is greater than a refractive index difference between the at least two adjacent layers in a third out-of-plane direction for the reflective film.
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Accused Products
Abstract
Optical devices such as light pipes which incorporate multilayer optical films in which the refractive indices of two adjacent layers in the thickness direction are substantially matched or are small relative to the difference in refractive indices of said two adjacent layers in an given in-plane direction which is at least 0.05. The multilayer optical film exhibits low absorptivity and can reflect light approaching at shallow angles as well as normal to the film.
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Citations
18 Claims
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1. An optical device comprising a body having at least two opposing optical surfaces, at least a portion of each of the optical surfaces comprising a reflective film that reflects incident light of at least one polarization orientation over an intended bandwidth,
wherein the reflective film of each of the optical surfaces comprises a plurality of layers, wherein a refractive index difference between at least two adjacent layers in a first in-plane direction is greater than or equal to a refractive index difference between the at least two adjacent layers in a second in-plane direction for the reflective film, and further wherein the refractive index difference in the first in-plane direction is greater than a refractive index difference between the at least two adjacent layers in a third out-of-plane direction for the reflective film.
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11. An optical device comprising:
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a plurality of diverging wedges, each diverging wedge of the plurality of diverging wedges comprising two opposing optical surfaces, wherein each of the optical surfaces comprise a multilayer optical film, wherein the multilayer optical film comprises a plurality of layers, wherein a refractive index difference between at least two adjacent layers in a first in-plane direction is greater than or equal to a refractive index difference between the at least two adjacent layers in a second in-plane direction, and further wherein the refractive index difference in the first in-plane direction is greater than a refractive index difference between the at least two adjacent layers in a third out-of-plane direction. - View Dependent Claims (12, 13)
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14. A decorative article comprising:
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a plurality of diverging wedges, each diverging wedge of the plurality of diverging wedges comprising two opposing optical surfaces, wherein each of the optical surfaces comprise a multilayer optical film, wherein the multilayer optical film comprises a plurality of layers, wherein a refractive index difference between at least two adjacent layers in a first in-plane direction is greater than or equal to a refractive index difference between the at least two adjacent layers in a second in-plane direction, and further wherein the refractive index difference in the first in-plane direction is greater than a refractive index difference between the at least two adjacent layers in a third out-of-plane direction. - View Dependent Claims (15, 16, 17, 18)
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Specification