Pane provided with a functional film

• US 5,635,287 A
• Filed: 08/18/1994
• Issued: 06/03/1997
• Est. Priority Date: 05/26/1992
• Status: Expired due to Fees

• Current Assignee: Saint-Gobain Vitrage International
• Original Assignee: Saint-Gobain Vitrage International
• Inventors: Balian, Pierre, Oudard, Jean-Francois
• Primary Examiner(s): Nakarani, D. S.
• Application Number:
  US08/292,044
• Time in Patent Office: 1,020 Days
• Field of Search: 428/336, 428/426, 428/428, 428/215, 428/216, 428/432, 428/697, 428/699, 428/701, 428/702
• US Class Current: 428/216
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/3441 comprising carbon, a carbide or oxycarbide
• CPC Class Codes: C23C 16/30 Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
• CPC Class Codes: C23C 16/407 of zinc, germanium, cadmium, indium, tin, thallium or bismuth
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

This invention relates to a pane comprising a glass substrate (1) coated with at least one transparent, thin, low-emissivity and/or conducting "functional" film (3), and with an "intermediate" film (2) disposed between substrate (1) and functional film (3). The intermediate film (2) has an optical thickness between 150 and 195 nm, preferably at approximately 168 or 185 nm, so that the residual color of the reflected appearance of the substrate from the "film side" of the pane is in the range of the blues.

Claims

1. A pane for a building or automobile having reduced thermal emission comprising a glass substrate coated with at least one transparent, electrical-conducting, low-emissivity functional film having a refractive index of approximately 1.9 and a geometric thickness of between 300 and 420 nm, wherein an intermediate film is disposed between said substrate and said functional film, wherein the optical thickness of said intermediate film is between 168 and 185 nm and the refractive index ranges from 1.66 to 1.72 so as to obtain a blue residual reflected color on the film side of the substrate;

said intermediate film and functional film being deposited on said substrate via pyrolysis of organometallic or silicic precursors, said blue reflected residual color having a saturation c in the colorimetry system (L*, a*, b*) of less than 5.

2. The pane according to claim 1, wherein the refractive index of said intermediate film is between 1.68 and 1.70.

3. The pane according to claim 1, wherein said functional film comprises at least one doped metallic oxide selected from the group consisting of indium oxide doped with tin (ITO);

zinc oxide doped with indium (ZnO;

In), fluorine (ZnO;

F), aluminum (ZnO;

Al) or tin (ZnO;

Sn); and

tin oxide doped with fluorine (SnO₂ ;

F).

4. The pane according to claim 3, wherein said functional film is a film pyrolized from pulverulent compounds.

5. The pane according to claim 1, wherein said intermediate film comprises oxygen, silicon, carbon (Si, O, C);

oxygen, silicon, nitrogen (Si, O, N);

or a mixture thereof.

6. The pane according to claim 1, wherein said intermediate film is composed of a mixture of metallic oxides, comprising aluminum oxide and at least one metal oxide selected from the group consisting of zinc oxide, indium oxide, tin oxide and titanium oxide.

7. The pane according to claim 1, wherein said intermediate film has a physical thickness of approximately 100 to 110 nm and a refractive index of approximately 1.68 and wherein said functional film has a physical thickness of approximately 340 nm to 400 nm, so as to obtain a blue residual reflected color on the film side of the pane.

8. The pane as claimed in claim 1, consisting of said substrate, said intermediate film and said functional film.