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High infrared reflection coatings and thin film coating deposition methods

  • US 7,572,509 B2
  • Filed: 10/10/2006
  • Issued: 08/11/2009
  • Est. Priority Date: 10/11/2005
  • Status: Active Grant
First Claim
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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.

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