Anti-iridescence coatings
First Claim
1. A substantially transparent glazing article comprising a substantially transparent substrate bearing a coating on a surface thereof, said coating comprising an optically functional layer having a refractive index higher than the substrate, and an anti-iridescence layer which is less thick than the optically functional layer and positioned mediate the substrate surface and the optically functional layer, the anti-iridescence layer comprising a first high refractive index zone directly on the substrate surface, having a refractive index at least 0.1 higher than the substrate, a first low refractive index zone over the first high refractive index zone, having a refractive index at least 0.1 lower than the first high refractive index zone, a second high refractive index zone over the first low refractive index zone, having a refractive index at least 0.1 higher than the first low refractive index zone, and a second low refractive index zone over the second high refractive index zone, having a refractive index at least 0.1 lower than the second high refractive index zone.
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Accused Products
Abstract
A glazing article comprises a substrate bearing a substantially transparent coating comprising an optically functional topcoat and a thinner anti-iridescence layer undercoat mediate the topcoat and the substrate. The anti-iridescence layer eliminates or substantially reduces iridescence and, in addition, is readily designed to make the overall coating either colorless or to provide a substantially uniform muted color. The anti-iridescence layer comprises a first thickness zone in which the refractive index is higher than that of the substrate. A low refractive index zone is positioned directly on the high refractive index zone. A second high refractive index zone is positioned on the low refractive index zone, such that the low refractive index zone is directly sandwiched between the two high refractive index zones. A fourth zone, a low refractive index zone, follows the second high refractive index zone. Anti-iridescence is provided for a wide variety of optically functional topcoats without significant impairment of the optical performance thereof. Certain preferred embodiments are particularly well adapted for low emissivity glazing for architectural applications.
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Citations
15 Claims
- 1. A substantially transparent glazing article comprising a substantially transparent substrate bearing a coating on a surface thereof, said coating comprising an optically functional layer having a refractive index higher than the substrate, and an anti-iridescence layer which is less thick than the optically functional layer and positioned mediate the substrate surface and the optically functional layer, the anti-iridescence layer comprising a first high refractive index zone directly on the substrate surface, having a refractive index at least 0.1 higher than the substrate, a first low refractive index zone over the first high refractive index zone, having a refractive index at least 0.1 lower than the first high refractive index zone, a second high refractive index zone over the first low refractive index zone, having a refractive index at least 0.1 higher than the first low refractive index zone, and a second low refractive index zone over the second high refractive index zone, having a refractive index at least 0.1 lower than the second high refractive index zone.
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13. A substantially transparent, low emissivity glazing article comprising a substantially transparent glass substrate having a substantially transparent coating on a surface thereof, the coating comprising an optically functional layer having a refractive index of approximately 1.9 and a substantially uniform thickness of about 2,000 to 5,000 Angstroms, consisting essentially of SnO2, and an anti-iridescence layer mediate the substrate surface and the optically functional layer, consisting essentially of:
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a first high refractive index zone directly on the substrate surface, consisting essentially of SnO2 and having a refractive index of approximately 1.9 and a substantially uniform thickness of about 100 to 300 Angstroms; a first low refractive index zone directly on the first high refractive index zone, consisting essentially of SiO2 and having a refractive index of approximately 1.44 and a substantially uniform thickness of about 100 to 300 Angstroms; a second high refractive index zone directly on the first low refractive index zone, consisting essentially of SnO2 and having a refractive index of approximately 1.9 and a substantially uniform thickness of about 100 to 300 Angstroms; and a second low refractive index zone directly on the second high refractive index zone and directly under the optically functional layer, consisting essentially of SiO2 and having a refractive index of approximately 1.44 and a substantially uniform thickness of about 100 to 300 Angstroms.
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14. A method of making a substantially transparent glazing article comprising the steps of:
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depositing a first high refractive index zone directly on a surface of a substantially transparent substrate, the first high refractive index zone having a refractive index at least 0.1 higher than said substrate; then depositing a first low refractive index zone over the first high refractive index zone, the first low refractive index zone having a refractive index at least 0.1 lower than the first high refractive index zone; then depositing a second high refractive index zone over the first low refractive index zone, the second high refractive index zone having a refractive index at least 0.1 higher than the first low refractive index zone; then depositing a second low refractive index zone over the second high refractive index zone, the second low refractive index zone having a lower refractive index at least 0.1 lower than the second high refractive index zone; and then depositing an optically functional layer thicker than the anti-iridescence layer over the second low refractive index zone. - View Dependent Claims (15)
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Specification