Multiple cavity low-emissivity coatings
First Claim
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1. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outward:
- a) a first transparent dielectric film region;
b) a first infrared-reflection film region;
c) a second transparent dielectric film region;
d) a second infrared-reflection film region;
e) a third transparent dielectric film region;
f) a third infrared-reflection film region;
g) a fourth transparent dielectric film region;
wherein the transparent substrate is part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glazing unit, wherein the coating has a metal/dielectric ratio of at least 0.22 and yet the insulating glazing unit has a visible transmittance of 0.65 or more, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, the coating having a primary dielectric-region ratio of less than 0.75, the primary dielectric-region ratio being defined as the thickness of the first transparent dielectric film region divided by the thickness of the fourth transparent dielectric film region.
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Abstract
Multiple cavity low-emissivity coatings. The coating includes three infrared-reflection film regions, which may each include silver.
134 Citations
22 Claims
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1. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outward:
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a) a first transparent dielectric film region; b) a first infrared-reflection film region; c) a second transparent dielectric film region; d) a second infrared-reflection film region; e) a third transparent dielectric film region; f) a third infrared-reflection film region; g) a fourth transparent dielectric film region; wherein the transparent substrate is part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glazing unit, wherein the coating has a metal/dielectric ratio of at least 0.22 and yet the insulating glazing unit has a visible transmittance of 0.65 or more, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, the coating having a primary dielectric-region ratio of less than 0.75, the primary dielectric-region ratio being defined as the thickness of the first transparent dielectric film region divided by the thickness of the fourth transparent dielectric film region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outward:
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a) a first transparent dielectric film region; b) a first infrared-reflection film region; c) a second transparent dielectric film region; d) a second infrared-reflection film region; e) a third transparent dielectric film region; f) a third infrared-reflection film region; g) a fourth transparent dielectric film region; wherein the coating has a metal/dielectric ratio of at least 0.25, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, wherein the transparent substrate is part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glazing unit, the insulating glazing unit having an exterior reflected color characterized by an ah color coordinate of between about +1.5 and about −
2 and a bh color coordinate of between about 0 and about −
3, wherein the second infrared-reflection film region is thicker than the first infrared-reflection film region by at least 30 angstroms, and wherein between the first infrared-reflection film region and said major surface of the substrate there is a desired total thickness of transparent dielectric film having a refractive index of 1.7 or greater, said desired total thickness being less than 195 angstroms, wherein the three infrared-reflection film regions have a combined thickness of greater than 470 angstroms, and wherein the insulating glazing unit has a visible transmittance of 0.65 or more.- View Dependent Claims (13, 14, 15)
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16. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outward:
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a) a first transparent dielectric film region; b) a first infrared-reflection film region; c) a second transparent dielectric film region; d) a second infrared-reflection film region; e) a third transparent dielectric film region; f) a third infrared-reflection film region; g) a fourth transparent dielectric film region; wherein the coating has a metal/dielectric ratio of at least 0.25, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, wherein the transparent substrate is part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glazing unit, wherein the coating has a sheet resistance of less than 1.4 ohms/square and yet the insulating glazing unit has a visible transmittance of 0.65 or more, wherein the second infrared-reflection film region is thicker than the first infrared-reflection film region by at least 30 angstroms, and wherein between the first infrared-reflection film region and said major surface of the substrate there is a desired total thickness of transparent dielectric film having a refractive index of 1.7 or greater, said desired total thickness being less than 195 angstroms. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification