US 7,572,509 B2
	High infrared reflection coatings and thin film coating deposition methods
Klaus Hartig, Avoca, Wis. (US)
Assigned to Cardinal CG Company, Eden Prairie, Minn. (US)
Filed on Oct. 10, 2006, as Appl. No. 11/545,212.
Claims priority of provisional application 60/725891, filed on Oct. 11, 2005.
Prior Publication US 2007/0082168 A1, Apr. 12, 2007
Int. Cl. B32B 15/04 (2006.01); B32B 17/06 (2006.01)

U.S. Cl. 428—432  [428/428; 428/434]

19 Claims

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.