Composite glass having reduced thickness for a head-up display (HUD)
A composite glass for a head-up display is described. The composite glass has an outer pane made of glass and an inner pane made of glass, which are bonded to one another via a thermoplastic intermediate layer. The inner pane has a thickness less than 1.2 mm, and the thickness of the intermediate layer in the vertical course between a lower edge and an upper edge of the composite glass is variable at least in sections with a maximum wedge angle less than or equal to 0.3 mrad.
1. A composite glass for a head-up display comprising:
an upper edge,
a lower edge,
an outer pane made of glass, and
an inner pane made of glass,
wherein
the outer pane and the inner pane are bonded to one another via a thermoplastic intermediate layer, wherein the intermediate layer consists of a single film,
the inner pane has a thickness less than 1.2 mm, and
a thickness of the intermediate layer in the vertical course between the lower edge and the upper edge is variable at least in one or more sections, having a maximum wedge angle less than or equal to 0.3 mrad.
2. The composite glass according to claim 1 , wherein the composite glass is a motor vehicle windshield.
3. The composite glass according to claim 1 , wherein the outer pane has a thickness less than 2.1 mm.
4. The composite glass according to claim 3 , wherein the thickness of the outer pane is from 1.2 to 2.0 mm.
5. The composite glass according to claim 4 , wherein the thickness of the outer pane is from 1.4 to 1.8 mm.
6. The composite glass according to claim 1 , wherein the thickness of the inner pane is from 0.3 to 1.1 mm.
7. The composite glass according to claim 6 , wherein the thickness of the inner pane is from 0.5 to 0.9 mm.
8. The composite glass according to claim 7 , wherein the thickness of the inner pane is from 0.6 to 0.8 mm.
9. The composite glass according to claim 1 , wherein the wedge angle is less than or equal to 0.2 mrad.
10. The composite glass according to claim 9 , wherein the wedge angle is less than or equal to 0.15 mrad.
11. The composite glass according to claim 10 , wherein the wedge angle is less than or equal to 0.1 mrad.
12. The composite glass according to claim 1 , wherein the intermediate layer is implemented by one thermoplastic film, and wherein the wedge angle is created by stretching.
13. The composite glass according to claim 1 , wherein the intermediate layer has a minimum thickness from 0.5 mm to 1 mm.
14. The composite glass according to claim 13 , wherein the intermediate layer has a minimum thickness from 0.6 mm to 0.9 mm.
15. The composite glass according to claim 1 , wherein the intermediate layer comprises at least one component selected from the group consisting of: i) polyvinyl butyral (PVB), ii) ethylene vinyl acetate (EVA), and iii) polyurethane (PU),
or mixtures or copolymers or derivatives thereof.
16. The composite glass according to claim 1 , wherein the outer pane and/or the inner pane is a chemically prestressed pane.
17. A projection arrangement for a head-up display comprising:
the composite glass according to claim 1 and further comprising a projector,
wherein
the projector is aimed at a region of the composite glass, and
a thickness of the intermediate layer is variable at least in said region.
18. A method comprising:
using the composite glass according to claim 1 as a windshield in a motor vehicle, wherein the composite glass is a projection surface of a head-up display.
19. A composite glass for a head-up display, comprising:
an upper edge,
a lower edge,
an outer pane made of glass, and
an inner pane made of glass,
wherein
the outer pane and the inner pane are bonded to one another via a thermoplastic intermediate layer,
the inner pane has a thickness from 0.5 mm to 0.9 mm, and
a thickness of the intermediate layer in the vertical course between the lower edge and the upper edge is variable at least in one or more sections, having a maximum wedge angle less than or equal to 0.2 mrad.
20. The composite glass according to claim 19 , wherein the composite glass is a motor vehicle windshield.
21. The composite glass according to claim 19 , wherein the outer pane has a thickness less than 2.1 mm.
22. The composite glass according to claim 21 , wherein the thickness of the outer pane is from 1.2 to 2.0 mm.
23. The composite glass according to claim 19 , wherein the wedge angle is less than or equal to 0.15 mrad.
24. The composite glass according to claim 19 , wherein the wedge angle is less than or equal to 0.1 mrad.
25. The composite glass according to claim 19 , wherein the intermediate layer has a minimum thickness from 0.5 mm to 1 mm.
26. A method for producing a composite glass for a head-up display comprising an upper edge and a lower edge, the method comprising the steps of:
(a) providing a thermoplastic intermediate layer, having variable thickness in a course between two opposing edges at least in one or more sections having a maximum wedge angle less than or equal to 0.3 mrad, wherein the intermediate layer consists of a single film;
(b) arranging the intermediate layer between an outer pane made of glass and an inner pane made of glass having a thickness of less than 1.2 mm, wherein said edges are oriented toward the upper edge and the lower edge; and
(c) bonding the inner pane and the outer pane to one another by lamination.
27. The method according to claim 26 , wherein the wedge angle is introduced into a thermoplastic film of constant thickness by stretching.