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Transparent substrate provided with a thin-film stack

  • US 6,210,784 B1
  • Filed: 10/22/1999
  • Issued: 04/03/2001
  • Est. Priority Date: 10/22/1998
  • Status: Expired due to Term
First Claim
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1. Transparent substrate provided with a thin-film stack including at least one low-emissivity metallic layer with infrared reflection properties arranged between underlying and overlying dielectric-based coatings, the underlying coating having a wetting layer based on zinc oxide ZnO, or aluminum-doped zinc oxide ZnO:

  • Al, which is directly in contact with the metallic layer, wherein each of the two coatings based on the dielectric material comprises at least one layer with a high refractive index of greater than or equal to 2.2, and wherein the overlying dielectric-based coating has the following sequence of layers deposited in the order stated;

    a) first layer(s) of material(s) having a refractive index ni-2 of less than 2.2;

    b) intermediate layer(s) of material(s) having a refractive index ni-2;

    c) last layer(s) of material(s) having a refractive index ni substantially equal to ni-2. wherein ni-1 of the intermediate layer is at least 0.3 less than ni of the last layer; and

    further comprising a layer with refractive index that is greater than or equal to 2.2 arranged between the reflective metallic layer and the sequence of layers the overlying dielectric-based coating.

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