Multiple cavity low-emissivity coatings. The coating includes three infrared-reflection film regions, which may each include silver.
대표청구항▼
What is claimed is: 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 dielec
What is claimed is: 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. 2. The transparent substrate of claim 1 wherein the metal/dielectric ratio is at least 0.25. 3. The transparent substrate of claim 2 wherein the metal/dielectric ratio is at least at least 0.27. 4. The transparent substrate of claim 1 where the three infrared-reflection film regions have a combined thickness of greater than 470 angstroms. 5. The transparent substrate of claim 1 wherein the visible transmittance is 0.66 or more. 6. The transparent substrate of claim 1 wherein the-multiple-pane insulating glazing unit has 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. 7. The transparent substrate of claim 1 wherein the multiple-pane insulating glazing unit has a solar heat gain coefficient of less than 0.29. 8. The transparent substrate of claim 7 wherein the solar heat gain coefficient is less than 0.28. 9. The transparent substrate of claim 8 wherein the solar heat gain coefficient is 0.27 or less. 10. The transparent substrate of claim 7 wherein the insulating glazing unit has 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. 11. The transparent substrate of claim 10 wherein the solar heat gain coefficient is 0.27 or less. 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: 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. 13. The transparent substrate of claim 12 wherein the visible transmittance is 0.66 or more. 14. The transparent substrate of claim 12 wherein the exterior reflected color of the insulating glazing unit is characterized by an ah color coordinate of between about +1 and about-1 and a bh color coordinate of between about-0.5 and about-2.5. 15. The transparent substrate of claim 12 wherein the combined thickness of the three infrared-reflection film regions is greater than 485 angstroms. 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: 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. 17. The transparent substrate of claim 16 wherein the three infrared-reflection film regions have a combined thickness of greater than 470 angstroms, the third infrared-reflection film region has a thickness that is greater than a thickness of the second infrared-reflection film region, and the second infrared-reflection film region has a thickness that is greater than a thickness of the first infrared-reflection film region. 18. The transparent substrate of claim 17 wherein the combined thickness of the three infrared-reflection film regions is greater than 485 angstroms. 19. The transparent substrate of claim 18 wherein the visible transmittance is 0.66 or more. 20. The transparent substrate of claim 18 wherein the insulating glazing unit has 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. 21. The transparent substrate of claim 16 wherein the coating has a base/outer ratio of greater than about 0.45, the base/outer ratio being defined as a combined thickness of the first and fourth transparent dielectric film regions divided by a combined thickness of the second and third transparent dielectric film regions. 22. The transparent substrate of claim 21 wherein the base/outer ratio is greater than about 0.475.
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