Headlight lens for a vehicle headlight

1. Headlight lens for a vehicle headlight, the headlight lens having:

a monolithic body of transparent material, the monolithic body including a light passage section;

at least one optically operative light entry face inclined with respect to an optical axis of the light passage section at an angle of between 5° and 70°;

at least one optically operative light exit face;

a light tunnel passing over into the light passage section via a bend; and

the light passage section being configured for imaging the bend as a light-dark-boundary.

2. The headlight lens of claim 1 , wherein the light entry face is inclined with respect to the optical axis of the light passage section at an angle of between 20° and 50°.

3. The headlight lens of claim 1 , wherein the light tunnel comprises a region on its surface which corresponds essentially to a part of the surface of an ellipsoid.

4. The headlight lens of claim 1 , wherein the light tunnel comprises a region on its surface, for which the following applies:

0.75

·

a

·

1

-

y

2

b

2

-

z

2

c

2

≤

x

≤

1.25

·

a

·

1

-

y

2

b

2

-

z

2

c

2

0.75

·

b

·

1

-

x

2

a

2

-

z

2

c

2

≤

y

≤

1.25

·

b

·

1

-

x

2

a

2

-

z

2

c

2

,

in which

z is a coordinate in the direction (of the optical axis) of the light tunnel;

x is a coordinate orthogonal to the direction of the optical axis of the light tunnel;

y is a coordinate orthogonal to the direction of the optical axis of the light tunnel and to the x-direction;

a is a number having a value greater than 0;

b is a number having a value greater than 0; and

c is a number having a value greater than 0.

5. The headlight lens of claim 1 , wherein a surface of the light passage section facing the light tunnel is curved at least in the region of the bend.

6. The headlight lens of claim 1 , wherein a surface of the light passage section facing the light tunnel is curved convexly at least in the region of the bend.

7. The headlight lens of claim 1 , wherein bend is curved in its longitudinal extension.

8. The headlight lens of claim 1 , wherein the bend, in its longitudinal extension, comprises a curvature having a radius of curvature in the orientation of the optical axis of the light passage section.

9. The headlight lens of claim 1 , wherein the bend, in its longitudinal extension, comprises a curvature having a radius of curvature in the orientation of an optical axis of the light tunnel.

10. The headlight lens of claim 9 , wherein the radius of curvature is orientated opposite to the light exit face.

11. The headlight lens of claim 1 , wherein the length of the headlight lens, when viewed in the orientation of the optical axis of the light passage section amounts to no more than 7 cm.

12. The headlight lens of claim 1 , wherein the bend is curved in a first direction and in a second direction.

13. The headlight lens of claim 12 , wherein the first direction is orthogonal to the second direction.

14. Headlight lens for a vehicle headlight, the headlight lens having:

a monolithic body of transparent material, the monolithic body including

a light passage section;

at least one optically operative light entry face inclined with respect to an optical axis of the light passage section;

at least one optically operative light exit face;

a light tunnel passing over into the light passage section via a bend; and

the light passage section being configured for imaging the bend as a light-dark-boundary, wherein a surface of the light passage section facing the light tunnel is curved convexly at least in the region of the bend.

15. The headlight lens of claim 14 , wherein the light entry face is inclined with respect to the optical axis of the light passage section at an angle of between 20° and 50°.

16. The headlight lens of claim 14 , wherein the light tunnel comprises a region on its surface which corresponds essentially to a part of the surface of an ellipsoid.

17. The headlight lens of claim 14 , wherein the light tunnel comprises a region on its surface, for which the following applies:

0.75

·

a

·

1

-

y

2

b

2

-

z

2

c

2

≤

x

≤

1.25

·

a

·

1

-

y

2

b

2

-

z

2

c

2

0.75

·

b

·

1

-

x

2

a

2

-

z

2

c

2

≤

y

≤

1.25

·

b

·

1

-

x

2

a

2

-

z

2

c

2

,

in which

z is a coordinate in the direction (of the optical axis) of the light tunnel;

x is a coordinate orthogonal to the direction of the optical axis of the light tunnel;

y is a coordinate orthogonal to the direction of the optical axis of the light tunnel and to the x-direction;

a is a number having a value greater than 0;

b is a number having a value greater than 0; and

c is a number having a value greater than 0.

18. The headlight lens of claim 14 , wherein bend is curved in its longitudinal extension.

19. The headlight lens of claim 14 , wherein the bend, in its longitudinal extension, comprises a curvature having a radius of curvature in the orientation of the optical axis of the light passage section.

20. The headlight lens of claim 14 , wherein the bend, in its longitudinal extension, comprises a curvature having a radius of curvature in the orientation of an optical axis of the light tunnel.

21. The headlight lens of claim 20 , wherein the radius of curvature is orientated opposite to the light exit face.

22. The headlight lens of claim 14 , wherein the length of the headlight lens, when viewed in the orientation of the optical axis of the light passage section amounts to no more than 7 cm.

23. The headlight lens of claim 14 , wherein the bend is curved in a first direction and in a second direction.

24. The headlight lens of claim 23 , wherein the first direction is orthogonal to the second direction.

25. Headlight lens for a vehicle headlight, the headlight lens having:

a monolithic body of transparent material, the monolithic body including a light passage section;

at least one optically operative light entry face inclined with respect to an optical axis of the light passage section;

at least one optically operative light exit face;

a light tunnel passing over into the light passage section via a bend, the light tunnel comprising a region on its surface which corresponds essentially to a part of the surface of an ellipsoid; and

the light passage section being configured for imaging the bend as a light-dark-boundary.

26. The headlight lens of claim 25 , wherein the light entry face is inclined with respect to the optical axis of the light passage section at an angle of between 20° and 50°.

27. The headlight lens of claim 25 , wherein the light tunnel comprises a region on its surface, for which the following applies:

0.75

·

a

·

1

-

y

2

b

2

-

z

2

c

2

≤

x

≤

1.25

·

a

·

1

-

y

2

b

2

-

z

2

c

2

0.75

·

b

·

1

-

x

2

a

2

-

z

2

c

2

≤

y

≤

1.25

·

b

·

1

-

x

2

a

2

-

z

2

c

2

,

in which

z is a coordinate in the direction (of the optical axis) of the light tunnel;

x is a coordinate orthogonal to the direction of the optical axis of the light tunnel;

y is a coordinate orthogonal to the direction of the optical axis of the light tunnel and to the x-direction;

a is a number having a value greater than 0;

b is a number having a value greater than 0; and

c is a number having a value greater than 0.

28. The headlight lens of claim 25 , wherein a surface of the light passage section facing the light tunnel is curved at least in the region of the bend.

29. The headlight lens of claim 25 , wherein a surface of the light passage section facing the light tunnel is curved convexly at least in the region of the bend.

30. The headlight lens of claim 25 , wherein bend is curved in its longitudinal extension.

31. The headlight lens of claim 25 , wherein the bend, in its longitudinal extension, comprises a curvature having a radius of curvature in the orientation of the optical axis of the light passage section.

32. The headlight lens of claim 25 , wherein the bend, in its longitudinal extension, comprises a curvature having a radius of curvature in the orientation of an optical axis of the light tunnel.

33. The headlight lens of claim 32 , wherein the radius of curvature is orientated opposite to the light exit face.

34. The headlight lens of claim 25 , wherein the length of the headlight lens, when viewed in the orientation of the optical axis of the light passage section amounts to no more than 7 cm.

35. The headlight lens of claim 25 , wherein the bend is curved in a first direction and in a second direction.

36. The headlight lens of claim 35 , wherein the first direction is orthogonal to the second direction.