12-07-2018 дата публикации
Номер: US20180194675A1
Принадлежит:
A material includes a transparent substrate coated with a stack of thin layers successively including, starting from the substrate, an alternation of three silver-based functional metal layers of increasing thickness and of four dielectric coatings denoted, starting from the substrate, M1, M2, M3 and M4, wherein each dielectric coating includes at least one high-index dielectric layer, the refractive index of which is at least 2.15 and the optical thickness of which is greater than 20 nm. 1. A material comprising a transparent substrate coated with a stack of thin layers successively comprising , starting from the substrate , an alternation of three silver-based functional metal layers denoted , starting from the substrate , first , second and third functional layers , the thicknesses of the functional metal layers , starting from the substrate , increase as a function of the distance from the substrate , and of four dielectric coatings denoted , starting from the substrate , M1 , M2 , M3 and M4 , each dielectric coating comprising at least one dielectric layer , so that each functional metal layer is positioned between two dielectric coatings , wherein:the dielectric coatings M1, M2, M3 and M4 each have an optical thickness To1, To2, To3 and To4,each dielectric coating comprises at least one high-index dielectric layer, the refractive index of which is at least 2.15 and the optical thickness of which is greater than 20 nm,a sum of the optical thicknesses of all the high-index dielectric layers of one and the same dielectric coating is denoted, according to the dielectric coating concerned, Tohi1, Tohi2, Tohi3 or Tohi4, [{'br': None, 'i': Tohi', '/To, '11>0.30,'}, {'br': None, 'i': Tohi', '/To, '22>0.30,'}, {'br': None, 'i': Tohi', '/To, '33>0.30,'}, {'br': None, 'i': Tohi', '/To, '44>0.30.'}], 'each dielectric coating satisfies the following relationship2. The material as claimed in claim 1 , wherein the three functional metal layers satisfy the following ...
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