Heated Laminated Glass Pane Having an Improved Vision Comfort

• US 20080318011A1
• Filed: 06/29/2006
• Published: 12/25/2008
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Chaussade, Pierre, Goffin, Guillaume, Legois, Vincent
• Granted Patent: US 8,471,177 B2
• Time in Patent Office: Days
• US Class Current: 428/210
• CPC Class Codes: B32B 17/10045 with at least one intermediate layer consisting of a glass sheet
• CPC Class Codes: B32B 17/10137 Chemical strengthening
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10293 Edge features, e.g. inserts or holes
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 2203/017 Manufacturing methods or apparatus for heaters
• CPC Class Codes: H05B 3/86 the heating conductors being embedded in the transparent or reflecting material H05B3/845 takes precedence
• CPC Class Codes: Y10T 156/1039 Surface deformation only of sandwich or lamina [e.g., embossed panels]
• CPC Class Codes: Y10T 428/24926 including ceramic, glass, porcelain or quartz layer

Abstract

A laminated heated glazing including at least two superposed transparent and mechanically strong substrate panes with interposition of an interlayer made of a transparent plastic between two adjacent panes. The glazing further includes, in its thickness or on the surface, at least one thin transparent conductive film that extends over at least part of the glazing, the film or films being heated for deicing and/or demisting by Joule effect, at least one film having flow separation lines formed by etching to guide current from one band to the other. The width of the flow separation lines is small enough for them to be invisible to the naked eye in the laminated heated glazing.

Claims

1-16. -16. (canceled)

17. :

A laminated heated glazing comprising;

at least two superposed transparent and mechanically strong substrate panes with interposition, between two adjacent panes, of an interlayer made of a transparent plastic;

in a thickness or on a surface of the glazing, at least one thin transparent conductive film that extends over at least part of the glazing, the at least one film being heated for deicing and/or demisting by Joule effect, with a heating area between two current leads in a case of a single-phase current supply, or with three heating areas between their own current leads in a case of three-phase current supply,

the current leads being placed on a boundary of the glazing and being connected to a current source external to the glazing, at least one thin film having flow separation lines formed by etching, to guide current from one band to another,

wherein the width of the flow separation lines is small enough for the flow separation lines to be invisible to the naked eye in the laminated heated glazing.

18. :

The heated glazing as claimed in claim 17, wherein the flow separation lines each have a width of 0.1 to 0.2 mm.

19. :

The heated glazing as claimed in claim 17, wherein the flow separation lines are filmed by etching the thin conductive film over a depth that may go as far as the subadjacent film.

20. :

The heated glazing as claimed in claim 17, wherein the flow separation lines are continuous lines, discontinuous lines, or dotted lines.

21. :

The heated glazing as claimed in claim 17, wherein the at least one thin film having flow separation lines is a demisting film.

22. :

The heated glazing as claimed in claim 17, wherein the flow separation lines are arranged along substantially parallel lines that are joined approximately at right angles to their respective two current lead bands and that have bends or inflections when the two bands or parts of bands facing each other make an angle between them.

23. :

The heated glazing as claimed in claim 17, wherein the current supply is a three-phase supply, wherein the three heating areas are bounded by two phase separation lines that are drawn approximately parallel to the flow separation lines and are formed by etching, going down to the subjacent film and having a width of 1 to 2 mm, the current lead bands arranged for star connection or delta connection.

24. :

The glazing as claimed in claim 17, wherein the thin conductive film is a film of tin oxide or a film of tin-doped indium oxide or a film of fluorine-doped tin oxide, each of the films generally having a thickness of 50 to 500 nanometers, or a silver or gold film generally having a thickness of 50 to 200 nanometers.

25. :

The glazing as claimed in claim 17, wherein the thin conductive film is bounded on its periphery by a line that is closed on itself and also formed by etching, the line enclosing the current lead band and formed over a depth going down to the subjacent film.

26. :

The glazing as claimed in claim 17, of a side or front window for an aircraft cockpit, wherein the laminated structure comprises at least first and second structural glass panes configured to be fixed in a rebate of the aircraft and bonded together via a first interlayer made of transparent plastic, at least a third pane that is not fixed to the rebate and is linked to the structural glass pane that is turned toward the outside via a second interlayer made of plastic, and at least one thin conductive film placed within the thickness of the glazing.

27. :

The glazing as claimed in claim 26, further comprising a thin demisting film, placed either;

on the first structural pane, on a face turned toward the exterior of the glazing or on a face turned toward the interior of the glazing;

on the second structural pane, on a face turned toward the outside of the glazing.

28. :

The glazing as claimed in claim 26, further comprising a thin deicing film on the third pane, on a face turned toward the interior of the glazing.

29. :

The glazing as claimed in claim 17, wherein the current lead bands with a thin conductive film are placed between the layers of the glazing, which comprise between them the thin conductive film.

30. :

The glazing as claimed in claim 17, further comprising at least one thin functional film other than the heating film, or a solar protection thin functional film, or an electrochromic thin function film, plural of the thin functional films being in a form of a multilayer stack.

31. :

A process for fabrication of a glazing as defined in claim 17, whereby an assembly of transparent substrate panes are joined together by transparent plastic interlayers, at least one of the panes including a thin transparent conductive film having flow separation lines and current leads, wherein the flow separation lines are formed by ablation using a YAG laser, or a Nd;

YAG pulsed laser of 1064 nm wavelength, of 20 W pump power and peak power ranging from 2.8 to 110 kW.

32. :

The process as claimed in claim 31, wherein a line defining the periphery of the conductive film and, in a case of a three-phase supply, the phase separation lines, are formed simultaneously with the flow separation lines.