Patent ID: 8043707

Claim:
A low-emissivity multilayer system comprising: a substrate bearing, a lower antireflection coating consisting of several partial layers and including a layer consisting essentially of ZnO which is adjacent to a silver-based functional layer, a metallic blocking layer located on top of the silver-based layer, an upper antireflection coating consisting of several partial layers and a cover coating, which itself may optionally consist of several partial layers applied by vacuum sputtering, wherein the upper antireflection coating comprises: a partial layer of ZnO or a mixed oxide ZnMeO x , wherein x indicates a stoichiometric amount of O in relation to Zn and Me, that contains ZnO or a succession of layers of mixed oxides comprising ZnO:Al/ZnMeO x , wherein x indicates a stoichiometric amount of O in relation to Zn and Me and wherein Me is Sn, Al, Bi, Sb or In; a partial layer of Si 3 N 4 or Si x O y N z , wherein x, y and z indicate stoichiometric amounts of Si, O and N, respectively; and between and in direct contact with these two partial layers, a separating layer with a thickness of 0.5 to 5 nm, consisting of a metal oxide or a mixed oxide with a cubic crystal lattice, which prevents direct contact between the two partial layers.