Durchsichtiges Substrat mit Antireflektionsbeschichtung

A glass substrate (1) has an anti-reflection multilayer coating (6) including an alkali diffusion barrier layer for separating the substrate from a layer (4) which may be degraded by contact with alkali metal ions. A transparent (especially glass) substrate (1) has an anti-reflection coating (6) comprising a stack of alternating high and low refractive index thin dielectric layers, the novelty being that one or more layers, which form part of the anti-reflection coating (6) and which act as an alkali metal diffusion barrier, are provided between the substrate (1) and a layer (4) which may be degraded by contact with sodium ions in order to prevent modification of the optical properties of the anti-reflection coating (6) when the substrate is subjected to a hardening, bending or annealing heat treatment. Independent claims are also included for (i) single, laminated or insulating multiple glazing which incorporates the above substrate; and (ii) a process for manufacturing of the above substrate, in which the or each initial layer is deposited by CVD, especially directly on a float glass ribbon, and the subsequent layers are deposited by cathodic sputter deposition on the cut glass.