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Abstract

A method of producing mirrors comprising depositing onto a ribbon of hot glass during the production process a coating comprising a reflecting layer and at least two reflection enhancing layers whereby the mirrors have a visible light reflection of at least 70%. There is also provided a mirror having such a coating. In a preferred embodiment the coating comprises: an inner layer having a refractive index of at least 1.6; an intermediate layer of relatively low refractive index and; an outer layer having a refractive index of at least 1.6; the intermediate layer having a refractive index less than the refractive index of either said inner layer or said outer layer and less than 3, provided that at least one of said inner and outer layers is of silicon, the aggregate refractive index of the inner and outer layers is at least 5.5, and the thicknesses of the layers are such that the mirror has a visible light reflection of at least 70%. In an alternative embodiment, one of the inner and outer layers may instead be composed of a low refractive index reflective metal.

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First Claim