Substrate comprising a stack with thermal properties

Details Substrate comprising a stack with thermal properties Substrate comprising a stack with thermal properties

C - Chemistry, Metallurgy

03

C

C03C 17/36 (2006.01) B32B 17/06 (2006.01)

Patent

CA 2717921

The invention relates to a glass substrate (10) having, on a main side, a stack of thin layers comprising a functional metallic layer (40) with reflective properties in infrared and/or solar radiation, particularly silver-based or based on a metallic alloy containing silver, and two anti-reflective coatings (20, 60), said coatings each comprising at least one dielectric layer (22, 64) silicon-nitride based, possibly doped with at least one other element, such as aluminum, said functional layer (40) being placed between the two antireflective coatings (20, 60), characterized in that the optical thickness e60 in nm of the underlying antireflective coating (60) is: e60 = 5 x e40 + a, where e40 is the geometric thickness in nm of the functional layer (40) such as 13 < e40< 25, and preferably 14 < e40 < 18, and where a is a number = 25 ± 15.

Image L'invention se rapporte à un substrat (10) verrier muni sur une face principale d'un empilement de couches minces comportant une couche fonctionnelle (40) métallique à propriétés de réflexion dans l'infrarouge et/ou dans le rayonnement solaire, notamment à base d'argent ou d'alliage métallique contenant de l'argent, et deux revêtements antireflet (20, 60), lesdits revêtements comportant chacun au moins une couche diélectrique (22, 64) à base de nitrure de silicium, éventuellement dopé à l'aide d'au moins un autre élément, comme l'aluminium, ladite couche fonctionnelle (40) étant disposée entre les deux revêtements antireflet (20, 60), caractérisé en ce que l'épaisseur optique e60 en nm du revêtement antireflet sus-jacent (60) est : e60 = 5 x e40 + .alpha., où e40 est l'épaisseur géométrique en nm de la couche fonctionnelle (40) telle que 13 < e40 < 25, et de préférence 14 < e40 < 18, et où .alpha. est un nombre = 25 ~ 15.

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