초록

The invention provides low-emissivity coatings that are highly reflective of infrared radiation. The coating includes three infrared-reflection film regions, which may each comprise silver.

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What is claimed is: 1. A coated transparent pane having opposed first and second major surfaces, said coated pane being part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has a between-pane space to which the second major surface of said

What is claimed is: 1. A coated transparent pane having opposed first and second major surfaces, said coated pane being part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has a between-pane space to which the second major surface of said coated pane is exposed, said second major surface bearing a low-emissivity coating that has both a sheet resistance of less than 3.0 Ω/square and an emissivity of less than 0.025, said low-emissivity coating comprising three infrared-reflection film regions defined as first, second, and third infrared-reflection film regions, the first infrared-reflection film region being closer to said second major surface than is the second infrared-reflection film region, the third infrared-reflection film region being further from said second major surface than is the second infrared-reflection film region, wherein the three infrared-reflection film regions have a combined thickness of between 420 Å and 575 Å and yet the glazing unit has a visible transmittance of greater than 0.60, the coating having a first reflection-region ratio defined as the thickness of the first infrared-reflection film region divided by the thickness of the second infrared-reflection film region, the coating having a second reflection-region ratio defined as the thickness of the second infrared-reflection film region divided by the thickness of the third infrared-reflection film region, both the first and second reflection-region ratios being less than 0.83, and at least one of the first and second reflection-region ratios being less than 0.80, such that the glazing unit has a visible-thermal efficiency ratio of greater than 2.3, the visible-thermal efficiency ratio being defined as the visible transmittance of the glazing unit divided by a solar heat gain coefficient of the glazing unit, the low-emissivity coating including transparent dielectric film between said second major surface and the first infrared-reflection film region, and wherein between the first infrared-reflection film region and said second major surface the coating has transparent dielectric film having a refractive index of 1.7 or greater. 2. The coated pane of claim 1 wherein between the first infrared-reflection film region and said second major surface the coating has less than 190 angstroms of transparent dielectric film having a refractive index of 1.7 or greater. 3. The coated pane of claim 1 wherein the low-emissivity coating has a total thickness of greater than 1,800 angstroms. 4. The coated pane of claim 1 wherein the low-emissivity coating has a total thickness of greater than 1,900 angstroms. 5. The coated pane of claim 1 wherein said emissivity is less than 0.02. 6. The coated pane of claim 1 wherein said emissivity is less than 0.015. 7. The coated pane of claim 1 wherein said sheet resistance is less than 2.5 Ω/square. 8. The coated pane of claim 1 wherein said sheet resistance is less than 2.0 Ω/square. 9. The coated pane of claim 1 wherein the visible transmittance is greater than 0.65. 10. The coated pane of claim 1 wherein the low-emissivity coating includes at least one nitride or oxynitride film having a thickness of less than 150 angstroms, and wherein the coating further includes at least one nitride or oxynitride film having a thickness of greater than 50 angstroms. 11. The coated pane of claim 1 wherein the coated pane has a major dimension of at least one meter. 12. The coated pane of claim 1 wherein said second major surface is a #2 surface of the multiple-pane insulating glazing unit. 13. The coated pane of claim 1 wherein both panes of the multiple-pane insulating glazing unit are clear glass. 14. The coated pane of claim 1 wherein the sheet resistance is less than 1.4 Ω/square. 15. The coated pane of claim 1 wherein the emissivity is less than 0.023. 16. The coated pane of claim 1 wherein the solar heat gain coefficient is between 0.25 and 0.29. 17. The coated pane of claim 1 wherein the coated pane has a transmission at 740 nm of less than 0.15. 18. The coated pane of claim 17 wherein the transmission at 740 nm is less than 0.05. 19. The coated pane of claim 1 wherein the thickness of at least one of the infrared-reflection film regions is greater than 175 Å.