Patent ID: 6602587
Filing Date: 2003-08-05
Classification: B32B,C03C,G02B,Y10T

Abstract:
A transparent substrate, comprising a stack of thin layers having at least one layer with properties in the infra-red range, which comprises on a carrier substrate in order:a) a first undercoating comprising a dielectric material; b) optionally, a primer metallic coating, the metal thereof being selected from the group consisting of Nb, Ta, Ti, and an alloy of at least two of these metals; c) at least one layer having properties in the infra-red range; and d) a second overcoating, comprising dielectric material; wherein in order to prevent modification of properties of the stack when a carrier substrate thereof is submitted to a thermal treatment of bending or tempering; i) the first underlying coating comprising dielectric material has at least a first barrier layer for the diffusion of alkaline ions and oxygen; and ii) the second overcoating comprising dielectric material has at least a second barrier layer for the diffusion of oxygen; and further wherein iii) an oxide layer is intercalated between the first underlying coating and the layer having properties in the infrared range, and an oxide layer is also intercalated between the layer having properties in the infrared range and the second overcoating; the first underlying coating and second overcoating being selected from the group consisting of silicon nitride, silicon oxide, aluminum nitride, and silicon oxynitride.