LAMINATED GLAZING FOR A LIGHT AERIAL VEHICLE, HEATING OVER A PORTION OF ITS SURFACE

Abstract

A light aerial vehicle laminated glazing includes a structural transparent plastic sheet covering the whole of the surface of the glazing, a protective transparent plastic sheet covering the whole of the surface of the glazing, an interlayer adhesive bonding the structural and protective sheets, a glass covered with a conductive layer having a heating function incorporated within the adhesive and covering a fraction of the surface of the glazing at most equal to 66% containing the main viewing zone.

Claims

1. A light aerial vehicle laminated glazing comprising: a structural transparent plastic sheet covering a whole of a surface of the glazing, a protective transparent plastic sheet covering the whole of the surface of the glazing, an interlayer adhesive bonding the structural and protective transparent plastic sheets, a glass covered with a conductive layer having a heating function incorporated within the adhesive and covering a fraction of the surface of the glazing at most equal to 66% containing a main viewing zone.

2. The laminated glazing as claimed in claim 1, wherein the structural and protective transparent plastic sheets are constituted of polymethyl methacrylate (PMMA), polycarbonate (PC), polyurethane (PU), polyester, alone or in combination, mixture, alloy or copolymer of several of them.

3. The laminated glazing as claimed in claim 1, wherein the adhesive is constituted of thermoplastic polyurethane (TPU), polyvinylbutyral (PVB) or ethylene/vinyl acetate (EVA), alone or in combination, mixture, alloy or copolymer of several of them.

4. The laminated glazing as claimed in claim 1, wherein a thickness of the structural plastic sheet is between 4 and 9 mm.

5. The laminated glazing as claimed in claim 1, wherein the structural transparent plastic sheet is a laminate of identical or different materials.

6. The laminated glazing as claimed in claim 1, wherein a thickness of the protective transparent plastic sheet is between 0.5 and 4 mm.

7. The laminated glazing as claimed in claim 1, wherein a thickness of the interlayer adhesive layer of adhesive is between 1.5 and 4 mm.

8. The laminated glazing as claimed in claim 1, wherein the structural and protective plastic sheets have a total thickness of between 4 and 9 mm.

9. The laminated glazing as claimed in claim 1, wherein one at least of its two exterior faces exhibits at least one functionalization of hydrophobic, hydrophilic, abrasion-resistance or electric dissipator type.

10. The laminated glazing as claimed in claim 1, wherein a thickness of the glass is between 0.5 and 1.2 mm.

11. The laminated glazing as claimed in claim 1, wherein the glass is a soda-lime, borosilicate or aluminosilicate glass having undergone chemical reinforcing.

12. The laminated glazing as claimed claim 1, wherein the conductive layer is on a face of the glass oriented toward the protective or structural plastic sheet.

13. The laminated glazing as claimed in claim 1, wherein the conductive layer is made of transparent doped metal oxide, is metallic or is interference metallic.

14. The laminated glazing as claimed in claim 1, wherein a surface area of the glass is limited to the main viewing zone increased by a width at least equal to 10 mm on its periphery.

15. The laminated glazing as claimed in claim 1, wherein the laminated glazing is suitable for being directly bolted to the vehicle or adhesively bonded to a frame bolted to the vehicle or adhesively bonded to the vehicle.

16. The laminated glazing as claimed in claim 1, wherein a vehicle/glazing mechanical connection is made solely on the structural plastic sheet or on the structural plastic sheet+protective plastic sheet laminate.

17. A method comprising manufacturing an anti-icing glazing with the laminated glazing as claimed in claim 1, in which the protective transparent plastic sheet is intended to be oriented toward the outside atmosphere.

18. A method comprising manufacturing an antimisting glazing with the laminated glazing as claimed in claim 1, in which the protective transparent plastic sheet is intended to be oriented toward an inside of the vehicle.

19. The laminated glazing as claimed in claim 6, wherein a thickness of the protective transparent plastic sheet is between 1 and 1.5 mm.

20. The laminated glazing as claimed in claim 10, wherein the thickness of the glass is between 0.5 and 0.7 mm.

Description

[0047] The invention is now illustrated by the following description of the single appended drawing:

[0048] FIG. 1 diagrammatically represents in section a helicopter heated glazing according to the invention.

[0049] With reference to FIG. 1, a helicopter glazing exhibits curvatures which are most pronounced in the top and bottom parts, a double curvature and a nondevelopable geometry. It consists of a structural sheet 1 of PMMA with a thickness of 6 mm laminated with a protective sheet 3 of PMMA with a thickness of 1.25 mm by means of an interlayer adhesive layer 2 of TPU with a thickness of 2.25 mm.

[0050] In a central part of the surface of the laminated glazing, a sheet of chemically reinforced aluminosilicate glass 4 with a thickness of 0.7 mm is incorporated in the adhesive layer 2. The glass sheet 4 carries, on its face oriented toward the structural sheet 1, an ITO heating layer. The latter makes it possible to prevent the formation of ice on the free surface of the protective sheet 3, in contact with the outside atmosphere. It is noticed that the glass sheet 4 is relatively flat to very slightly curved, confined in the main viewing zone of the laminated glazing, which comprises, above and respectively below the glass sheet 4, zones of complex curvature having a nondevelopable surface.