Patent ID: 8883277

Claim:
A multiple glazing unit, comprising: a first substrate; a second substrate; and a third substrate, each substrate having at least two faces, which are held together by a frame structure, in which at least two intermediate gas-filled cavities each lie between two of the substrates, wherein at least one of the substrates comprises, on at least one face in contact with an intermediate gas-filled cavity, an antireflection film which is in a face-to-face relationship, relative to said intermediate gas-filled cavity, with an insulating film having reflection properties for at last one of infrared and solar radiation, wherein the insulating film comprises a low-E or solar-control thin-layers stack, and the thin-layers stack comprises at least one functional layer having a reflection property for the at least one of infrared and solar radiation, the thin-layers stack comprises a single metallic functional layer between two dielectric films the metallic functional layer comprises silver or a silver-comprising metal alloy, the two dielectric films each comprise a dielectric layer, an optical thickness e 120 of the dielectric film subjacent to the functional layer is greater than the optical thickness e 160 of the dielectric film superjacent to the functional layer, a ratio of the optical thickness e 120 of the subjacent dielectric film to an optical thickness e 160 of the superjacent dielectric film, e 120 /e 160 , is from 1.05 and 1.4, including these values.