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AssigneeSaint-Gobain Vitrage
InventorsOlivier Guiselin, Philippe Macquart, Veronique Rondeau
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The subject of the invention is a transparent substrate (1), in particular one made of glass, coated with a stack (7) of thin layers comprising at least one layer (4) having reflection properties in the infrared and/or in the solar radiation range, this layer (4) being interposed between a first and a second coating (3, 6) comprising a dielectric material. An interlayer (2) made of a material having a refractive index less than that of the substrate (1) is interposed between the substrate (1) and the stack (7) such that the difference in refractive indices between the substrate (1) and the layer (2) is at least 0.07 and preferably at least 0.12.
A transparent substrate provided with a stack of thin layers, having an emissivity of at most 0.044, a light transmission of at least 78% and a color saturation value C* of at most approximately 4 in reflection, comprising at least one layer having reflection properties in the infra-red or solar radiation range or both, interposed between a first and second coating comprising a dielectric material, wherein an interlayer comprising material having a refractive index less than that of the substrate is interposed between the substrate and the stack such that the difference in a refractive indices between the substrate and the interlayer is at least 0.07.
Dependencies are inferred from the claim text.