Non-iridescent glass structures
First Claim
1. A process for making a non-iridescent, transparent, structure of the type comprising(A) a transparent substrate,(B) an infra-red reflective coating thereon and(C) an iridescence-suppressing interlayer between said substrate and infra-red-reflective coating, said process comprising the steps of forming, between said infra-red-reflective coating and said transparent substrate, an interlayer formed of two coatings(1) a coating nearer to said substrate a first interlayer component of relatively high refractive index material;
- (2) a coating over said relatively high refractive index material, a second interlayer component of relatively low refractive index material, and(3) terminating each interlayer component at such a thickness that the combined interlayer components form said iridescence-suppressing means and the total optical thickness of said interlayer components is about 1/6th of a 500 nanometer design wavelength.
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Abstract
This disclosure describes transparent glass window structures of the type bearing a coating of infra-red reflective material which is advantageously less than about 0.85 microns in thickness and wherein the observance of iridescence resulting from such a reflective coating is markedly reduced by provision of a very thin coating system beneath said infra-red reflective coating. The thin coating system forms means to reflect and refract light to interfere with the observation of iridescence. A particular advantage of the invention is the ability of the thin coating system to be coated in a fraction of time presently required to coat anti-iridescent interlayers of the prior art.
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Citations
12 Claims
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1. A process for making a non-iridescent, transparent, structure of the type comprising
(A) a transparent substrate, (B) an infra-red reflective coating thereon and (C) an iridescence-suppressing interlayer between said substrate and infra-red-reflective coating, said process comprising the steps of forming, between said infra-red-reflective coating and said transparent substrate, an interlayer formed of two coatings (1) a coating nearer to said substrate a first interlayer component of relatively high refractive index material; -
(2) a coating over said relatively high refractive index material, a second interlayer component of relatively low refractive index material, and (3) terminating each interlayer component at such a thickness that the combined interlayer components form said iridescence-suppressing means and the total optical thickness of said interlayer components is about 1/6th of a 500 nanometer design wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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10. A process as defined in any of claims 1, 2, 3, 6, 7, 8, or 9 wherein said refractive indices and optical thicknesses of said substrate, said interlayer components and said infra-red reflective coating are selected to provide a color saturation value below about 12.
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11. A process as defined in any of claims 1, 2, 3, 6, 7, 8, or 9 wherein said refractive indices and optical thicknesses of said substrate said interlayer components and said infra-red reflective coating are selected to provide a color saturation value below about 8.
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12. A process for making a non-iridescent, transparent, structure of the type comprising
(A) a transparent substrate, (B) an electrically conductive coating thereon and (C) an iridescence-suppressing interlayer between said substrate and said conductive coating, said process comprising the steps of forming, between said conductive coating and said transparent substrate, an interlayer by (1) coating nearer to said substrate a first interlayer component of relatively high refractive index material; -
(2) coating over said relatively high refractive index material, a second interlayer component of relatively low refractive index material, and (3) terminating each interlayer component at such a thickness that the combined interlayer components for said iridescence-suppressing means and with the total optical thickness of said interlayer components are about 1/6th of a 500 nanometer design wavelength.
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Specification