Automotive Glazing with Selective Diffusion

• US 20080285134A1
• Filed: 03/09/2006
• Published: 11/20/2008
• Est. Priority Date: 03/10/2005
• Status: Abandoned Application

• Current Assignee: AGC Flat Glass (AGC, Inc.)
• Original Assignee: AGC Flat Glass (AGC, Inc.)
• Inventors: Degand, Etienne, Closset, Francois, Lucca, Nerio
• Application Number:
  US11/908,154
• Publication Number:
  US 20080285134A1
• Time in Patent Office: Days
• US Class Current: 359/601
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/1055 characterized by the resin layer, i.e. interlayer
• CPC Class Codes: B32B 17/10706 being photo-polymerized
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: G02B 5/0236 the diffusion taking place within the volume of the element
• CPC Class Codes: G02B 5/0278 used in transmission

Abstract

Automotive glazing which can diffuse light in a distinct manner depending on the angle of incidence thereof on the glazing, whereby a first incidence angle range corresponds to diffusion of at least 30% of the light and a second incidence angle range corresponds to diffusion of less than 10%.

Claims

1. Motor vehicle glazing which has the property of scattering light in a distinct manner along the angle of incidence of the light on the glazing, a first angle of incidence domain corresponding to a scattering of at least 30% of the light, and a second angle of incidence domain corresponding to less than 10% scattering.

2. Motor vehicle glazing according to claim 1, comprising at least one glass sheet and associated with it, a sheet of material giving it its properties of selective scattering along the angle of incidence of the light.

3. Glazing according to claim 1, in which, in the angle of incidence domain for which the scattering is low, this scattering is not greater than 5% and preferably less than 2%.

4. Glazing according to claim 1, in which, in the domain of high scattering, more than 30%, and preferably more than 70% of the light is scattered.

5. Glazing according to claim 1, in which the high scattering extends over an angle of incidence domain which is not less than an angle of 10 degrees, and preferably not less than an angle of 20 degrees.

6. Glazing according to claim 1, in which the zone of scattering greater than 5% does not extend over an angle of incidence domain greater than an angle of 90 degrees.

7. Glazing according to claim 1, in which the domain of scattering below 5% extends over an angle of at least 30 degrees and preferably an angle of 90 degrees.

8. Glazing according to claim 1, in which, when the glazing is installed in the motor vehicle, the domain of low-scattering angle, in a vertical plane approximately perpendicular to the plane of the glazing, extends on both sides of the horizontal.

9. Glazing according to claim 1, in which, when the glazing is installed in the motor vehicle, the domain of high-scattering angle, in a vertical plane approximately perpendicular to the plane of the glazing, extends on both sides of the vertical.

10. Glazing according to claim 2, comprising two glass sheets assembled in laminated form using an intermediate sheet comprising the sheet of material of which the light scattering depends on the angle of incidence.

11. Glazing according to claim 10, in which the intermediate sheet comprises, in addition to the sheet of material of which the light scattering depends on the incidence, at least one intermediate sheet traditionally used for forming laminated glazing.

12. Glazing according to claim 10, which is moreover coated on the side turned towards the inside of the vehicle with an anti-reflective thin layer.

13. Glazing according to claim 12, in which the anti-reflective layer comprises, starting from the glass sheet, a succession of layers having an alternately high and low index.

14. Glazing according to claim 1, forming a motor vehicle windscreen.

15. Motor vehicle glazing according to claim 2, in which the sheet, of which the scattering depends on the angle of incidence of the light, only covers some of the surface of the glass sheet.

16. Glazing according to claim 1, in which the glass sheet is a glass sheet whose solar factor (SF) according to the standard (EN 410) is at most 60% while retaining a light transmission which is not less than 80% under a thickness of 4 mm.

17. Glazing according to claim 1, in which the glass sheet comprises a set of thin layers having infrared-reflective properties.

18. Glazing according to claim 15, in which the sheet of which the scattering depends on the angle of incidence is located in the zone of the windscreen intended for reflecting images of the HUD type.

19. Glazing according to claim 1, forming a motor vehicle rear window.