Coated article with low-E coating having low visible transmission which may be used in IG window unit for grey appearance
AssigneeGuardian Europe S.A.R.L.
InventorsHartmut Knoll, Marcus Frank
Life of this patent
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Abstract
This invention relates to a coated article including a low-emissivity (low-E) coating. In certain example embodiments, the low-E coating is provided on a substrate (e.g., glass substrate) and includes at least first and second infrared (IR) reflecting layers (e.g., silver based layers) that are spaced apart by contact layers (e.g., NiCr based layers) and a dielectric layer of or including a material such as silicon nitride. In certain example embodiments, the coated article has a low visible transmission (e.g., no greater than 60%, more preferably no greater than about 55%, and most preferably no greater than about 50%).
Claims34
A coated article including a coating supported by a glass substrate, the coating comprising:
- first and second infrared (IR) reflecting layers comprising silver, the first IR reflecting layer being located closer to the glass substrate than is the second IR reflecting layer;
- a first contact layer comprising NiCr located over and directly contacting the first IR reflecting layer comprising silver;
- a dielectric layer comprising silicon nitride located over and directly contacting the first contact layer comprising NiCr;
- a second contact layer comprising NiCr located over and directly contacting the layer comprising silicon nitride;
- the second IR reflecting layer comprising silver located over and directly contacting the second contact layer comprising NiCr;
- a third contact layer comprising NiCr located over and directly contacting the second IR reflecting layer;
- another dielectric layer comprising silicon nitride located over and directly contacting the third contact layer comprising NiCr;
- wherein the second IR reflecting layer comprising silver is at least twice as thick as the first IR reflecting layer comprising silver;
- and
- wherein the coated article has a visible transmission, measured monolithically, of no greater than 55% and a glass side visible reflectance, measured monolithically, of no greater than 11%.
An insulating glass (IG) window unit comprising:
- a coated article including a coating supported by a first glass substrate;
- the first glass substrate with the coating thereon being coupled to a second glass substrate with a gap therebetween, and wherein the first glass substrate is adapted to be at an exterior/outside side of the IG window unit and the second glass substrate is adapted to be at an interior/inside side of the IG window unit adjacent an interior of a building on which the IG window unit is mounted or is to be mounted, and wherein the coating is on a major surface of the first glass substrate facing the gap between the substrates;
- wherein the coating supported by the first glass substrate comprises:
- first and second infrared (IR) reflecting layers comprising silver, the first IR reflecting layer being located closer to the glass substrate than is the second IR reflecting layer;
- a first contact layer comprising NiCr located over and directly contacting the first IR reflecting layer comprising silver;
- a dielectric layer comprising silicon nitride located over and directly contacting the first contact layer comprising NiCr;
- a second contact layer located over and directly contacting the layer comprising silicon nitride;
- the second IR reflecting layer comprising silver located over and directly contacting the second contact layer;
- a third contact layer comprising NiCr located over and directly contacting the second IR reflecting layer;
- another dielectric layer comprising silicon nitride located over and directly contacting the third contact layer comprising NiCr;
- wherein the second IR reflecting layer comprising silver is at least 30 angstroms thicker than is the first IR reflecting layer comprising silver;
- wherein the IG window unit has a visible transmission of no greater than 50% and an outside visible reflectance of no greater than 12%;
- and
- wherein the IG window unit is grey or dark grey in appearance as viewed from the outside, and wherein the first and second glass substrates of the IG window unit are clear, not grey, glass substrates.
Dependencies are inferred from the claim text.