Pane with an electrical heating region

1. A pane, comprising:

a substantially trapezoidal first pane with a surface, a first base with length l 1 and a second base with length l 2 , wherein a ratio v of the length l 1 to the length l 2 is such that:

v=l 1 :l 2 is from 0.70:1 to 0.98:1

at least one electrically conductive coating applied on a part of the surface;

at least one substantially trapezoidal electrical heating region electrically divided by at least one separating line from the electrically conductive coating, wherein a first base of the heating region is arranged immediately adjacent the first base of the first pane, and wherein a second base of the heating region is arranged immediately adjacent the second base of the first pane; and

at least two collecting conductors connected to the electrically conductive coating in the electrical heating region, the at least two collecting conductors configured to establish an electrical connection to a voltage source such that a current path for a heating current is formed between the collecting conductors,

wherein a ratio u of a length b 1 of the first base of the heating region to a length b 2 of the second base of the heating region is such that:

u=b 1 :b 2 is from v:0.99 to v:0.50.

2. The pane according to claim 1 , wherein:

u=b 1 :b 2 is from v:0.99 to 0.99, or

u=b 1 :b 2 is from 1.01 to v:0.50.

3. The pane according to claim 1 , wherein the first pane or the electrical heating region has a shape of a symmetrical trapezoid.

4. The pane according to claim 1 , wherein the first base of the heating region is arranged substantially parallel to the first base of the first pane.

5. The pane according to claim 1 , wherein the length of a shorter of the first base and the second base of the first pane is equal to the length of the immediately adjacent base of the heating region plus 2×r, wherein r is a width of an edge decoating region on each side of the pane.

6. The Pane according to claim 1 , wherein a width d of the separating line is from 30 μm to 200 μm.

7. The Pane according to claim 6 , wherein the width d of the separating line is from 70 μm to 140 μm.

8. The pane according to claim 1 , wherein the collecting conductors are implemented as fired printing paste that has a specific resistance ρ a from 0.8 μohm·cm to 7.0 μohm·cm.

9. The pane according to claim 8 , wherein the specific resistance ρ a is from 1.0 μohm·cm to 2.5 μohm·cm.

10. The pane according to claim 8 , wherein the fired printing paste contains one or more of: a) metallic particles, b) metal particles, c) carbon particles and d) silver particles.

11. The pane according to claim 1 , wherein the surface of the first pane is a really bonded to a second pane via a thermoplastic intermediate layer.

12. The pane according to claim 1 , wherein the first pane or the second pane contains one of a) glass, b) polymers, and c) mixtures of a) and b).

13. The pane according to claim 12 , wherein a) comprises flat glass, float glass, quarts glass, borosilicate glass, and/or soda lime glass.

14. The pane according to claim 12 , where b) comprises one or more of polyethylene, polypropylene, polycarbonate, and/or polymethylmethacrylate.

15. The pane according to claim 1 , wherein the electrically conductive coating is transparent.

16. The pane according to claim 1 , wherein the electrically conductive coating has a sheet resistance from 0.4 ohm/square to 10 ohm/square.

17. The pane according to claim 16 , wherein the sheet resistance is from 0.5 ohm/square to 1 ohm/square.

18. The pane according to claim 1 , wherein the electrically conductive coating contains one or more of: a) silver (Ag), b) indium tin oxide (ITO), c) fluorine-doped tin oxide (SnO 2 :F), and d) aluminum-doped zinc oxide (ZnO:Al).

19. The pane according to claim 1 , wherein the electrically conductive coating has, inside the electrical heating region, at least one coating-free region.

20. The pane according to claim 19 , wherein the at least one coating-free region forms a communication window.

21. The pane according to claim 19 , wherein the at least one coating free region is arranged in a center region of one of the first base and the second base of the first pane.

22. The pane according to claim 2 , wherein a distance h 1 between the at least two collecting conductors at a center of the electrical heating region is greater than a distance h 2 between the at least two collecting conductors at outer edges of the electrical heating region.

23. A method for producing a pane with an electrical heating region, the method comprising:

(a) preparing a substantially trapezoidal first pane having a surface, a first base with length l 1 , a second base with length l 2 , wherein a ratio v of the length l 1 to the length l 2 is such that:

v=1 1 :l 2 is from 0.70:1 to 0.98:1;

(b) applying an electrically conductive coating on a part of the surface of the first pane;

(c) providing an electrical division of at least one substantially trapezoidal electrical heating region from the electrically conductive coating by forming at least one separating line;

arranging a first base of the heating region immediately adjacent the first base of the first pane; and

arranging a second base of the heating region immediately adjacent the second base of the first pane,

wherein a ratio u of a length b 1 of the first base of the heating region to a length b 2 of the second base of the heating region is such that:

u=b 1 :b 2 is from v:0.99 to v:0.50; and

(d) providing at least two collecting conductors for connection to a voltage source, the at least two collecting electrodes being connected to the electrically conductive coating in the electrical heating region such that a current path for a heating current is formed between the at least two collecting conductors.

24. The method according to claim 23 , wherein the separating lines are formed by laser patterning.

25. A method comprising using the pane according to claim 1 in one or more of a) means of transportation for travel on land, in the air, or on water, b) as a functional individual piece, and c) as a built-in component in furniture, appliances, and buildings.

26. The method according to claim 25 , wherein a) comprises a windshield, a rear window, side panes, and/or roof panel of a motor vehicle.

27. The method according to claim 25 , wherein c) comprises an electrical heater.