Dual titanium nitride layers for solar control
First Claim
1. A method of fabricating a solar control member comprising steps of:
- sputtering a first titanium nitride layer on a first transparent substrate such that said first titanium nitride layer maintains a transmission of at least thirty percent with respect to visible light;
sputtering a second titanium nitride layer on a second transparent substrate such that said second titanium nitride layer maintains a transmissivity of at least thirty percent with respect to visible light; and
bonding said first titanium nitride layer to said second titanium nitride layer, including spacing said first titanium nitride layer from said second titanium nitride layer by a distance that is sufficient to promote optical decoupling therebetween.
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Accused Products
Abstract
A solar control member utilizes a combination of layers that include spaced apart titanium nitride layers to selectively transmit a higher percentage of visible light than near infrared energy, with a low visible light reflection. The titanium nitride layers are spaced apart by a distance that promotes optical decoupling with respect to occurrence of constructive and destructive interference of visible light propagating between the two titanium nitride layers. In one embodiment, the titanium nitride layers are spaced apart by a laminating adhesive layer. In another embodiment, the titanium nitride layers are formed on opposite sides of a substrate. The ratio of transmission at the wavelength of 550 nm to transmission at the wavelength of 1500 is at least 1.25. Each titanium nitride layer is sputter deposited. Care is taken to ensure that each layer does not become too metallic and to ensure that excessive oxygen is not incorporated into the layer. Thus, the nitrogen flow rate and the linespeed are controlled. Sputtering occurs at a fast rate using high powers and a minimum acceptable nitrogen flow, while minimizing background contamination.
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Citations
18 Claims
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1. A method of fabricating a solar control member comprising steps of:
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sputtering a first titanium nitride layer on a first transparent substrate such that said first titanium nitride layer maintains a transmission of at least thirty percent with respect to visible light;
sputtering a second titanium nitride layer on a second transparent substrate such that said second titanium nitride layer maintains a transmissivity of at least thirty percent with respect to visible light; and
bonding said first titanium nitride layer to said second titanium nitride layer, including spacing said first titanium nitride layer from said second titanium nitride layer by a distance that is sufficient to promote optical decoupling therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of fabricating a solar control member comprising steps of:
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providing a substantially transparent substrate;
forming a first titanium nitride layer at a fixed position relative to a first surface of said transparent substrate; and
forming a second titanium nitride layer at a fixed position from said first titanium nitride layer, said first and second titanium nitride layers being on a same side of said transparent substrate and being spaced apart by a distance of at least 700 nm to provide optical decoupling with respect to constructive and destructive interference of visible light propagating between said first and second titanium nitride layers, wherein said first and second titanium nitride layers cooperate to provide a higher transmission of visible light than infrared light. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification