| abstract |
Transparent substrate (6) comprising on at least one of its faces an anti-reflective coating, in particular at normal incidence made of a stack (A) of thin layers, characterized in that the stack successively comprises: - a first layer (1) with a refractive index n1 between 1.8 and 2.2 and with a geometric thickness e1 between 5 and 50 nm, - a second layer (2) with a refractive index n2 between 1.35 and 1, 65 and of geometric thickness e2 between 5 and 50 nm, - a third layer (3) of refractive index n3 between 1.8 and 2.2 and of geometric thickness e3 between 40 and 150 nm, - a fourth layer (4) of refractive index n4 between 1.35 and 1.65 and of geometric thickness e4 between 40 and 150 nm, |