Vehicular headlamp

1. A vehicular headlamp comprising:

a projection lens;

a light source disposed behind a rear focal point of the projection lens; and

a reflector that reflects light from the light source forward,

wherein the vehicular headlamp forms a forward light distribution pattern,

wherein the vehicular headlamp includes a plate-like shade having a front-end portion positioned in the vicinity of the rear focal point of the projection lens to form a cut-off line of the forward light distribution pattern,

wherein the shade extends rearward and obliquely downward from the front-end portion,

wherein an overhead sign reflective surface is provided on a lower surface of the shade,

wherein the overhead sign reflective surface reflects light from the reflector toward the projection lens to form a part of an overhead sign distribution pattern,

wherein a dark portion forming portion is formed on the overhead sign reflective surface, and

wherein the dark portion forming portion forms a first portion of the overhead sign distribution pattern corresponding to an eye point of a driver of an oncoming vehicle to be darker than a second portion around the eye point.

2. The vehicle headlamp according to claim 1 , wherein the dark portion forming portion is formed at a position spaced rearward from the rear focal point of the projection lens.

3. The vehicular headlamp according to claim 1 , wherein the dark portion forming portion is a projecting portion that projects downward.

4. The vehicular headlamp according to claim 1 , wherein the dark portion forming portion is formed in an elongated shape to extend in a longitudinal direction.

5. The vehicular headlamp according to claim 1 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

6. The vehicular headlamp according to claim 2 , wherein the dark portion forming portion is a projecting portion that projects downward.

7. The vehicular headlamp according to claim 2 , wherein the dark portion forming portion is formed in an elongated shape to extend in a longitudinal direction.

8. The vehicular headlamp according to claim 3 , wherein the dark portion forming portion is formed in an elongated shape to extend in a longitudinal direction.

9. The vehicular headlamp according to claim 6 , wherein the dark portion forming portion is formed in an elongated shape to extend in a longitudinal direction.

10. The vehicular headlamp according to claim 2 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

11. The vehicular headlamp according to claim 3 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

12. The vehicular headlamp according to claim 4 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

13. The vehicular headlamp according to claim 6 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

14. The vehicular headlamp according to claim 7 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

15. The vehicular headlamp according to claim 8 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.

16. The vehicular headlamp according to claim 9 , wherein the dark portion forming portion diffuses or absorbs light from the reflector to make the first portion darker than the second portion.