Non-iridescent glass structures
First Claim
1. In a non-iridescent, transparent, sheet structure of the type comprising(A) a transparent substrate,(B) an infra-red reflective coating and(C) an iridescence-suppressing interlayer means betweensaid substrate and infra-red-reflective coating, the improvement whereby said structure comprises, between said infra-red-reflective coating and said transparent substrate, an interlayer comprising(1) a first interlayer component of relatively high refractive index material, nearer to said substrate;
- (2) over said relatively high refractive index material, a second interlayer component of relatively low refractive index material, and(3) the combined interlayer components for said iridescence-suppressing means having a total optical thickness of 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
11 Claims
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1. In a non-iridescent, transparent, sheet structure of the type comprising
(A) a transparent substrate, (B) an infra-red reflective coating and (C) an iridescence-suppressing interlayer means between said substrate and infra-red-reflective coating, the improvement whereby said structure comprises, between said infra-red-reflective coating and said transparent substrate, an interlayer comprising (1) a first interlayer component of relatively high refractive index material, nearer to said substrate; -
(2) over said relatively high refractive index material, a second interlayer component of relatively low refractive index material, and (3) the combined interlayer components for said iridescence-suppressing means having a total optical thickness of about 1/6th of a 500 nanometer design wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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8. A structure as defined in any of claims 1, 2, 3, 4, 5, 6 or 7 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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9. A structure as defined in any of claims 1, 2, 3, 4, 5, 6 or 7 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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10. A structure as defined in claims 1, 2, 3, 4, 5, 6 or 7 which is free from any metallic component or colored component which functions primarily to absorb visible light.
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11. In a non-iridescent, transparent, sheet structure of the type comprising
(A) a transparent substrate; -
(B) an electrically conductive coating and (C) an iridescence-suppressing interlayer means between said substrate and electrically conductive coating, the improvement whereby said structure comprises, between said conductive coating and said transparent substrate, an interlayer comprising (1) a first interlayer component of relatively high refractive index material, nearer to said substrate; (2) over said relatively high refractive index material, a second interlayer component of relatively low refractive index material, and (3) the combined interlayer components for said iridescence-suppressing means having a total optical thickness of about 1/6th of a 500 nanometer design wavelength.
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Specification