Low-emissivity coatings that are highly reflective to infrared-radiation. The coating includes three infrared-reflection film regions, which may each include silver.
대표청구항▼
1. A first pane having opposed first and second major surfaces, the first pane being 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, wherein at least one of the first and second panes has an interio
1. A first pane having opposed first and second major surfaces, the first pane being 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, wherein at least one of the first and second panes has an interior surface that is exposed to a between-pane space of the insulating glazing unit and bears a temperable low-emissivity coating comprising, moving outwardly from said interior surface, a first transparent dielectric film region, a first infrared-reflection film region comprising silver, a first blocker film region over and contiguous to the first infrared-reflection film region comprising silver, a second transparent dielectric film region, a second infrared-reflection film region comprising silver, a second blocker film region over and contiguous to the second infrared-reflection film region comprising silver, a third transparent dielectric film region, a third infrared-reflection film region comprising silver, a third blocker film region over and contiguous to the second infrared-reflection film region comprising silver, and a fourth transparent dielectric film region, the first blocker film region comprising a first metal film and a first dielectric blocker film region, the first metal film being directly over the first infrared-reflection film region and the first dielectric blocker film region being directly over the first metal film, the second blocker film region comprising a second metal film and a second dielectric blocker film region, the second metal film being directly over the second infrared-reflection film region and the second dielectric blocker film region being directly over the second metal film, the third blocker film region comprising a third metal film and a third dielectric blocker film region, the third metal film being directly over the third infrared-reflection film region and the third dielectric blocker film region being directly over the third metal film, each of the first, second, and third metal films being deposited as a metallic film comprising aluminum, wherein each of the first, second, and third transparent dielectric film regions comprises an uppermost zinc tin oxide layer in contact with one of said infrared-reflection film regions comprising silver, each such zinc tin oxide layer having a metal-only weight ratio of tin weight divided by total zinc and tin weight of greater than zero and less than 0.30 and is deposited as zinc tin oxide sputtered from a compound of zinc and tin in an oxidizing atmosphere, wherein each of the first, second, and third metal films has a thickness of less than 25 angstroms, and wherein each of the first, second, and third dielectric blocker film regions has a thickness of less than 50 angstroms. 2. The first pane of claim 1 wherein at least one of the first blocker film region, the second blocker film region, and the third blocker film region comprises a combination including aluminum together with one or more other metallic materials. 3. The first pane of claim 2 wherein each of the first blocker film region, the second blocker film region, and the third blocker film region comprises a combination including aluminum together with one or more other metallic materials. 4. The first pane of claim 1 wherein the temperable low-emissivity coating includes at least two optical cavities, each having a thickness of between about 400 angstroms and about 750 angstroms. 5. The first pane of claim 1 wherein the first transparent dielectric film region comprises a graded thickness of film having a composition that changes with increasing distance from said interior surface. 6. The first pane of claim 1 wherein the temperable low-emissivity coating has a total physical thickness of greater than 1,750 angstroms. 7. The first pane of claim 6 wherein the total physical thickness of the temperable low-emissivity coating is greater than 2,000 angstroms. 8. The first pane of claim 1 wherein each of the first, second, and third dielectric blocker film regions has a thickness of less than 40 angstroms. 9. The first pane of claim 8 wherein each of the first, second, and third dielectric blocker film regions has a thickness of less than 30 angstroms. 10. The first pane of claim 9 wherein each of the first, second, and third dielectric blocker film regions has a thickness of less than 15 angstroms. 11. The first pane of claim 1 wherein the thickness of each of the first, second, and third metal films is less than 15 angstroms. 12. The first pane of claim 11 wherein the thickness of each of the first, second, and third metal films is less than 10 angstroms. 13. The first pane of claim 1 wherein at least one of the first, second, and third infrared-reflection film regions consists essentially of silver or silver with no more than about 5% of another metal. 14. The first pane of claim 13 wherein each of the first, second, and third infrared-reflection film regions consists essentially of silver or silver with no more than about 5% of said another metal. 15. The first pane of claim 14 wherein said another metal is selected from the group consisting of nickel, molybdenum, tantalum, platinum, and palladium. 16. The first pane of claim 13 wherein said another metal is selected from the group consisting of nickel, molybdenum, tantalum, platinum, and palladium. 17. The first pane of claim 1 wherein at least one of the first, second, third, and fourth transparent dielectric film regions includes one or more absorbing dielectric films. 18. The first pane of claim 17 wherein the one or more absorbing dielectric films comprise titanium nitride or titanium oxynitride. 19. The first pane of claim 1 wherein each of the first, second, third, and fourth transparent dielectric film regions includes one or more absorbing dielectric films. 20. The first pane of claim 19 wherein the one or more absorbing dielectric films comprise titanium nitride or titanium oxynitride.
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