Patent ID: 8377578

Claim:
Infrared radiation reflecting transparent layer system on a transparent substrate, comprising an infrared radiation reflecting layer sequence consisting of, as seen from the substrate upward, a. a first transparent dielectric layer of an oxynitride of a metal, a semiconductor or a semiconductor alloy having a low to moderate refractive index; b. a second transparent dielectric layer having a high refractive index; c. a blocking layer; d. a first interface layer; e. a selective function layer; f. an optionally present second interface layer; g. a second blocking layer; h. an optionally present third interface layer; i. a third transparent dielectric layer having a high refractive index and containing silicon; and j. an optionally present fourth transparent dielectric layer of an oxynitride of a metal, a semiconductor or a semiconductor alloy having a low to moderate refractive index.