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US 7,342,716 B2Granted
Multiple cavity low-emissivity coatings
AssigneeCardinal CG Company
InventorKlaus Hartig
Life of this patent
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Abstract
Multiple cavity low-emissivity coatings. The coating includes three infrared-reflection film regions, which may each include silver.
Claims22
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.
5 more elements
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 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.
5 more elements
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 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.
5 more elements
Dependencies are inferred from the claim text.