Patent ID: 7452603

Claim:
An article, comprising a transparent substrate, provided with a thin-film multilayer comprising three silver layers (Ag 1 , Ag 2 , Ag 3 ) and alternately on the substrate, a titanium dioxide layer, a metal oxide layer, one of the silver layers (Ag 1 , Ag 2 , Ag 3 ) and a covering layer and an antireflection layer comprising at least one metal oxide is deposited on the covering layer for the silver layer (Ag 3 ) furthest away from the substrate, wherein: the metal oxide is zinc oxide; the covering layer is a sacrificial metal; and wherein the thicknesses (e Ag1 , e Ag2 , e Ag3 ) of the silver layers (Ag 1 , Ag 2 , Ag 3 ) vary in a ratio of between 0.8 and 1.2 and are such that e Ag1 ≦e Ag3 ≦e Ag2 and wherein e Ag1 corresponds to the thickness of the silver layer closest to the substrate and e Ag3 corresponds to the thickness of the silver layer furthest from the substrate.