Glass substrate provided with a low emissivity film
First Claim
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1. A product, comprising:
- a glass substrate;
a conducting, low-emissivity transparent functional film on a first face of said glass substrate, having a refractive index of about 2 and a physical thickness of 200 to 400 nm, said functional film consisting of at least one doped metal oxide selected from the group consisting of indium oxide doped with tin, zinc oxide doped with indium, zinc oxide doped with fluorine, zinc oxide doped with aluminum, zinc oxide doped with tin, and tin oxide doped with fluorine;
an outer coating on said functional film having a refractive index less than that of the functional film, the optical thickness of the outer coating being about one-quarter of the mean wavelength centered on 550 nm; and
an intermediate coating disposed between the functional film and the glass substrate which has a refractive index less than that of the functional film and an optical thickness of between 50 and 100 nm.
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Abstract
The invention has as its subject a glass substrate provided with a conducting, low-emissivity transparent functional film, based upon metal oxide or oxides, on which is deposited an "outer" coating, the optical thickness of which is approximately one-quarter of the mean wavelength of the visible range, and preferably centered on 550 nm. In addition, an intermediate coating is provided between functional film and substrate, said coating having an optical thickness of from 50 to 100 nm, and preferably from 50 to 75 nm.
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Citations
14 Claims
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1. A product, comprising:
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a glass substrate; a conducting, low-emissivity transparent functional film on a first face of said glass substrate, having a refractive index of about 2 and a physical thickness of 200 to 400 nm, said functional film consisting of at least one doped metal oxide selected from the group consisting of indium oxide doped with tin, zinc oxide doped with indium, zinc oxide doped with fluorine, zinc oxide doped with aluminum, zinc oxide doped with tin, and tin oxide doped with fluorine; an outer coating on said functional film having a refractive index less than that of the functional film, the optical thickness of the outer coating being about one-quarter of the mean wavelength centered on 550 nm; and an intermediate coating disposed between the functional film and the glass substrate which has a refractive index less than that of the functional film and an optical thickness of between 50 and 100 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification