Low color purity, anti-reflection coatings for transparent glazings oriented at high angles of incidence
First Claim
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1. A low color purity, anti-reflection coating comprising:
- A) a first layer of dielectric material, having a refractive index from about 1.60 to about 1.75 and a thickness from about 750 Angstroms to about 950 Angstroms;
B) a second layer of dielectric material, having a refractive index from about 1.95 to about 2.35 and a thickness from about 1,050 Angstroms to about 1,350 Angstroms, adhered to the first layer; and
C) a third layer of dielectric material, having a refractive index from about 1.38 to about 1.44 and a thickness from about 1,100 Angstroms to about 1,200 Angstroms, adhered to the second layer opposite the first layer.
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Abstract
Three-layer, low color purity, anti-reflection coatings reduce the reflection of visible light rays and display a low color purity when glazings carrying such coatings are oriented at high angles of incidence with respect to a source of visible light. The reflectances are comparable and the color purity values are lower for such glazings, when compared with conventional glazings coated with 1/4-178 -174 wavelength anti-reflection coatings.
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Citations
11 Claims
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1. A low color purity, anti-reflection coating comprising:
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A) a first layer of dielectric material, having a refractive index from about 1.60 to about 1.75 and a thickness from about 750 Angstroms to about 950 Angstroms; B) a second layer of dielectric material, having a refractive index from about 1.95 to about 2.35 and a thickness from about 1,050 Angstroms to about 1,350 Angstroms, adhered to the first layer; and C) a third layer of dielectric material, having a refractive index from about 1.38 to about 1.44 and a thickness from about 1,100 Angstroms to about 1,200 Angstroms, adhered to the second layer opposite the first layer. - View Dependent Claims (2, 3)
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4. A motor vehicle, comprising a vehicle body and a vision glazing positioned at a high installation angle in an opening within the vehicle body, wherein the vision glazing has adhered to a surface thereof a low color purity, anti-reflection coating, comprising:
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A) a first layer of dielectric material, having a refractive index from about 1.60 to about 1.75 and a thickness from about 750 Angstroms to about 950 Angstroms; B) a second layer of dielectric material, having a refractive index from about 1.95 to about 2.35 and a thickness from about 1,050 Angstroms to about 1,350 Angstroms, adhered to the first layer; and C) a third layer of dielectric material, having a refractive index from about 1.38 to about 1.44 and a thickness from about 1,100 Angstroms to about 1,200 Angstroms, adhered to the second layer opposite the first layer. - View Dependent Claims (5, 6)
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7. A coated glazing, having a color purity of about 0.2 and reflectance of about 15.9% for visible light directed toward the glazing at an angle of incidence of about 65°
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8. A process for preparing a low color purity, anti-reflection coated transparent glazing, comprising the steps of:
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A) providing a transparent substrate, having a surface; B) adhering to the surface of the transparent substrate a first layer of dielectric material, having a refractive index from about 1.60 to about 1.75 and a thickness from about 750 Angstroms to about 950 Angstroms; C) adhering to the first layer, opposite the transparent substrate, a second layer of dielectric material, having a refractive index from about 1.95 to about 2.35 and a thickness from about 1,050 Angstroms to about 1,350 Angstroms; and D) adhering to the second layer, opposite the first layer, a third layer of dielectric material, having a refractive index from about 1.38 to about 1.44 and a thickness from about 1,100 Angstroms to about 1,200 Angstroms. - View Dependent Claims (9, 10, 11)
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Specification