Neutral, low emissivity coated glass articles and method for making
First Claim
1. A neutral, low emissivity coated article comprising:
- a. transparent substrate having a refractive index in the range of about 1.5 to 1.6;
b. a first transparent coating layer having a refractive index in the range of about 1.66 to 1.73 and a thickness in the range of about 400 to 600 Angstroms;
c. a second transparent coating layer having a refractive index in the range of about 1.76 to 1.83 and a thickness in the range of about 350 to 550 Angstroms; and
d. a metal oxide coating layer having a refractive index of at least 1.86 and a thickness sufficient to lower the emissivity of the coated substrate below the emissivity of the uncoated substrate.
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Abstract
A coated article and method of producing it are disclosed wherein the iridescence caused by the difference between the refractive index of a transparent substrate and the refractive index of a metal oxide coating is reduced by means of two intermediate layers, the first of which, closest to the substrate, has a refractive index higher than the refractive index of the substrate but lower than the refractive index of the second, and the second has a refractive index higher than the refractive index of the first but lower than the refractive index of the metal oxide coating. The thicknesses of the two intermediate layers for optimizing a neutral appearance are determined by the thickness and refractive index of the metal oxide coating.
48 Citations
14 Claims
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1. A neutral, low emissivity coated article comprising:
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a. transparent substrate having a refractive index in the range of about 1.5 to 1.6; b. a first transparent coating layer having a refractive index in the range of about 1.66 to 1.73 and a thickness in the range of about 400 to 600 Angstroms; c. a second transparent coating layer having a refractive index in the range of about 1.76 to 1.83 and a thickness in the range of about 350 to 550 Angstroms; and d. a metal oxide coating layer having a refractive index of at least 1.86 and a thickness sufficient to lower the emissivity of the coated substrate below the emissivity of the uncoated substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification