LAMINATED GLASS WINDSCREEN INTENDED TO BE USED AT THE SAME TIME AS A HUD SYSTEM REFLECTOR

• US 20020086141A1
• Filed: 07/24/1998
• Published: 07/04/2002
• Est. Priority Date: 07/24/1997
• Status: Abandoned Application

• Current Assignee: Saint-Gobain Vitrage
• Original Assignee: Saint-Gobain Vitrage
• Inventors: SAUER, GERD
• Application Number:
  US09/121,844
• Publication Number:
  US 20020086141A1
• Time in Patent Office: Days
• US Class Current: 428/156
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10339 Specific parts of the laminated safety glass or glazing being colored or tinted tinted glass sheet B32B17/1011; tinted interlayer B32B17/10651
• CPC Class Codes: B32B 17/10568 varying in thickness
• CPC Class Codes: B32B 17/1066 imparting a tint in certain regions only, i.e. shade band
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: G02B 2027/0121 Parasitic image effect attenuation by suitable positioning of the parasitic images
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/31601 Quartz or glass
• CPC Class Codes: Y10T 428/31616 Next to polyester [e.g., alkyd]

Abstract

A laminated safety glass windscreen, which can also be used as a reflector in a HUD system, comprises at least first and second panes and a thermoplastic intermediate layer which joins these panes together. The cross-section of the intermediate layer is in the shape of a wedge, decreasing in thickness from top to bottom. The thermoplastic intermediate layer may be composed of two sheets, one of which is provided with a colored filtering strip and has a wedged cross-section conditioned by the appearance of this filtering strip. The other sheet has a wedged cross-section such that the two sheets together have the prescribed convergence angle for using the windscreen as a reflector.

Claims

1. A laminated glass windscreen having a taper angle for a reflector in a HUD system, comprising:

(i) a first pane,

(ii) a second pane, and

(iii) a intermediate layer having a wedge-shaped cross-section, between said first and second panes, comprising

(a) a first thermoplastic sheet comprising a tinted filtering strip at an upper edge of said first thermoplastic sheet, and

(b) a second thermoplastic sheet, on said first thermoplastic sheet, wherein said second thermoplastic sheet has a wedge-shaped cross-section.

2. The laminated glass windscreen of claim 1, wherein said first thermoplastic sheet has a taper angle of 0.

3. The laminated glass windscreen of claim 1, wherein said first thermoplastic sheet has a wedge-shaped cross-section.

4. The laminated glass windscreen of claim 1, wherein said intermediate layer further comprises a support sheet comprising a functional layer, between said first thermoplastic sheet and said second thermoplastic sheet.

5. The laminated glass windscreen of claim 1, wherein said first thermoplastic sheet comprises a polymer selected from the group consisting of polyvinyl butyral and polyurethane.

6. The laminated glass windscreen of claim 1, wherein said second thermoplastic sheet comprises a polymer selected from the group consisting of polyvinyl butyral and polyurethane.

7. The laminated glass windscreen of claim 5, wherein said second thermoplastic sheet comprises a polymer selected from the group consisting of polyvinyl butyral and polyurethane.

8. The laminated glass windscreen of claim 1, wherein said first thermoplastic sheet comprises polyvinyl butyral, and said second thermoplastic sheet comprises polyvinyl butyral.

9. The laminated glass windscreen of claim 4, wherein said support sheet comprises polyethylene terephthalate.

10. A method of making the laminated glass windscreen of claim 1, comprising:

laminating said first pane, said intermediate layer and said second pane.

11. The method of claim 10, further comprising, prior to said laminating, stretching to form said first thermoplastic sheet with a wedge-shaped cross-section.

12. The method of claim 10, further comprising, prior to said laminating, extruding to form said second thermoplastic sheet in a wedge shape.

13. The method of claim 11, further comprising, prior to said laminating, extruding to form said second thermoplastic sheet in a wedge shape.

14. The method of claim 10, further comprising, prior to said laminating, stretching to form said second thermoplastic sheet with a wedge-shaped cross-section.

15. The method of claim 11, further comprising, prior to said laminating, stretching to form said second thermoplastic sheet with a wedge-shaped cross-section.

16. A method of making the laminated glass windscreen of claim 4, comprising:

laminating said first pane, said intermediate layer and said second pane.

17. A method of displaying an image, comprising:

projecting an image on the laminated glass windscreen of claim 1.

18. A method of displaying an image, comprising:

projecting an image on the laminated glass windscreen of claim 4.

19. A vehicle, comprising the laminated glass windscreen of claim 1.

20. A method of displaying an image, comprising:

projecting an image on a windscreen of a vehicle, wherein said windscreen is the laminated glass windscreen of claim 1, and

reflections of said image from said first pane and said second pane appear superimposed to a driver of said vehicle.