Dual silver layer Low-E glass coating system and insulating glass units made therefrom
First Claim
Patent Images
1. A sputter-coated glass article comprised of a glass substrate having thereon from the glass outwardly, a layer system including:
- a) a layer of Si3 N4 having a thickness of about 300 Å
-500 Å
;
b) a layer of nickel or nichrome having a thickness of about 7 Å
or less;
c) a layer of silver having a thickness of about 70 Å
-130 Å
;
d) a layer of nickel or nichrome having a thickness of about 7 Å
or less; and
e) a layer of Si3 N4 having a thickness of about 700 Å
-1,100 Å
;
f) a layer of nickel or nichrome having a thickness of about 7 Å
or less;
g) a layer of silver having a thickness of about 70 Å
-190 Å
, wherein said layer (g) is thicker than said layer (c);
h) a layer of nickel or nichrome having a thickness of about 7 Å
or less; and
i) a layer of Si3 N4 having a thickness of about 350 Å
-700 Å
;
whereinwhen said glass substrate has a thickness of about 2 mm-6 mm, said coated glass substrate has a visible transmittance of about 70% or greater, a normal emissivity (En) of about 0.02 -0.09, a hemispherical emissivity (Eh) of about 0.03-0.12, a sheet resistance (Rs) of about 2-10 ohms/sq. and having the following reflectance and color coordinates wherein the glass side characteristics are;
RG Y, less than about 10ah is about -3 to +5bh is about 0 to -10and wherein the film side characteristics are;
RF Y, less than about 10ah is about -3 to +5bh is about 0 to -10wherein RY is the reflectance and ah, bh are the color coordinates as measured in Hunter units, Ill., C, 10°
observer.
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Accused Products
Abstract
A sputter-coated glass layer system particularly useful in insulating glass units ("IGs"), which includes dual layers of silver separated by a layer of Si3 N4 having a thickness of about 700 Å-1,100 Å and further including an undercoat and an overcoat of Si3 N4 having thicknesses of about 300 Å-550 Å and about 350 Å-700 Å respectively, such that a glass so coated achieves normal emissivity values (En '"'"'s) of less than about 0.02-0.09 with good durability and very low reflectance.
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Citations
17 Claims
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1. A sputter-coated glass article comprised of a glass substrate having thereon from the glass outwardly, a layer system including:
-
a) a layer of Si3 N4 having a thickness of about 300 Å
-500 Å
;b) a layer of nickel or nichrome having a thickness of about 7 Å
or less;c) a layer of silver having a thickness of about 70 Å
-130 Å
;d) a layer of nickel or nichrome having a thickness of about 7 Å
or less; ande) a layer of Si3 N4 having a thickness of about 700 Å
-1,100 Å
;f) a layer of nickel or nichrome having a thickness of about 7 Å
or less;g) a layer of silver having a thickness of about 70 Å
-190 Å
, wherein said layer (g) is thicker than said layer (c);h) a layer of nickel or nichrome having a thickness of about 7 Å
or less; andi) a layer of Si3 N4 having a thickness of about 350 Å
-700 Å
;
whereinwhen said glass substrate has a thickness of about 2 mm-6 mm, said coated glass substrate has a visible transmittance of about 70% or greater, a normal emissivity (En) of about 0.02 -0.09, a hemispherical emissivity (Eh) of about 0.03-0.12, a sheet resistance (Rs) of about 2-10 ohms/sq. and having the following reflectance and color coordinates wherein the glass side characteristics are; RG Y, less than about 10 ah is about -3 to +5 bh is about 0 to -10 and wherein the film side characteristics are; RF Y, less than about 10 ah is about -3 to +5 bh is about 0 to -10 wherein RY is the reflectance and ah, bh are the color coordinates as measured in Hunter units, Ill., C, 10°
observer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification