Optical film
First Claim
1. A film, comprising:
- a first layer comprising a first polymeric material; and
a second layer, contiguous to said first layer, comprising a second polymeric material;
wherein the absolute value of the difference in indices of refraction between said first and second layers is Δ
x, Δ
y, and Δ
z, respectively, for light polarized along first, second, and third mutually orthogonal axes, wherein said third axis is orthogonal to the plane of said film, wherein Δ
x is greater than about 0.05, and wherein Δ
z is less than about 0.05.
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Accused Products
Abstract
Birefringent multilayer optical films in which the refractive indices in the thickness direction of two adjacent layers are substantially matched have a Brewster angle (the angle at which reflectance of p-polarized light goes to zero) which is very large or is nonexistant. This allows for the construction of multilayer mirrors and polarizers whose reflectivity for p-polarized light decreases slowly with angle of incidence, are independent of angle of incidence, or increase with angle of incidence away from the normal. As a result, multilayer films having high reflectivity (for both planes of polarization for any incident direction in the case of mirrors, and for the selected direction in the case of polarizers) over a wide bandwidth, can be achieved.
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Citations
45 Claims
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1. A film, comprising:
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a first layer comprising a first polymeric material; and a second layer, contiguous to said first layer, comprising a second polymeric material; wherein the absolute value of the difference in indices of refraction between said first and second layers is Δ
x, Δ
y, and Δ
z, respectively, for light polarized along first, second, and third mutually orthogonal axes, wherein said third axis is orthogonal to the plane of said film, wherein Δ
x is greater than about 0.05, and wherein Δ
z is less than about 0.05. - 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)
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27. A film, comprising:
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a first layer comprising a first polymeric material; and a second layer, contiguous to said first layer, comprising a second polymeric material; wherein the absolute value of the difference in index of refraction between said first and second polymeric material is Δ
x, Δ
y, and Δ
z, respectively, for light polarized along first, second, and third mutually orthogonal axes, wherein said third axis is orthogonal to the plane of said film, wherein Δ
z is less than 0.5 k, where k is the larger of Δ
x and Δ
y, and wherein k is at least about 0.05. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification