Lamp unit of vehicle headlamp

Abstract

A lamp unit of a vehicle headlamp characterized in a lamp unit of a vehicle headlamp includes a projecting lens arranged on an optical axis extended in a front and rear direction of a vehicle, a first light emitting element arranged on a rear side of a rear side focal point of the projecting lens, and a reflector for reflecting light from the first light emitting element to a front side to be proximate to an optical axis. A vicinity of a rear side focal face of the projecting lens is arranged with a plurality of second light emitting elements for emitting light to the projecting lens.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view showing a vehicle headlamp according to an embodiment of the invention.

FIG. 2 is a front view showing a first one of a lamp unit of the vehicle headlamp.

FIG. 3 is a sectional view taken along a line III-III of FIG. 2.

FIG. 4 is a sectional view taken along a line IV-IV of FIG. 2.

FIG. 5 is a view similar to FIG. 3 showing a second one of the lamp unit of the vehicle headlamp.

FIG. 6( a) is a diagram showing a light distribution pattern formed on an imaginary vertical screen disposed at a position of 25 m frontward from the lamp unit by light emitted from the first one of the lamp unit to a front side, FIG. 6(b) is a diagram showing a light distribution pattern formed on the imaginary vertical screen by light emitted from the second one of the lamp unit to the front side.

FIG. 7 is a front view showing a third one of a lamp unit of the vehicle headlamp.

FIG. 8 is a sectional view taken along a line VIII-VIII of FIG. 7.

FIG. 9 is a sectional view taken along a line IX-IX of FIG. 7.

FIG. 10 is a view similar to FIG. 8 showing a fourth one of a lamp unit of the vehicle headlamp.

FIG. 11( a) is a diagram showing a light distribution pattern formed on the imaginary vertical screen by light emitted from the third one of the lamp unit to the front side, FIG. 11(b) is a diagram showing a light distribution pattern formed on the imaginary vertical screen by light emitted from the fourth one of the lamp unit to the front side.

FIG. 12 is a diagram perspectively showing a light distribution pattern for low beam formed on the imaginary vertical screen by light emitted from the vehicle headlamp to the front side.

FIG. 13 is a diagram perspectively showing a light distribution pattern for high beam formed on the imaginary vertical screen by light emitted from the vehicle headlamp to the front side.

FIG. 14 is a view similar to FIG. 2 showing a lamp unit according to a first modified example of the embodiment.

FIG. 15 is a view similar to FIG. 2 showing a lamp unit according to a second modified example of the embodiment.

FIG. 16 is a diagram perspectively showing a light distribution pattern formed on the imaginary vertical screen by light irradiated from the lamp unit according to the second modified example to the front side.

Claims

1. A lamp unit of a vehicle headlamp comprising: a projecting lens arranged on an optical axis extended in a front and rear direction of a vehicle,a first light emitting element arranged on a rear side of a rear side focal point of the projecting lens, anda reflector for reflecting light from the first light emitting element to a front side proximate to an optical axis;wherein a vicinity of a rear side focal face of the projecting lens is arranged with a plurality of second light emitting elements for emitting light to the projecting lens.

2. The lamp unit of a vehicle headlamp according to claim 1, wherein the plurality of second light emitting elements are arranged at positions remote from the rear side focal face of the projecting lens.

3. The lamp unit of a vehicle headlamp according to claim 1, wherein the plurality of second light emitting elements are arranged to be contiguous to each other in a horizontal direction.

4. The lamp unit of a vehicle headlamp according to claim 1, wherein a shade for shielding a portion of light reflected from the reflector is arranged between the projecting lens and the reflector such that an upper end edge of the shade passes the rear side focal point of the projecting lens.

5. The lamp unit of a vehicle headlamp according to claim 4, wherein the shade is constituted as a mirror member including an upward directed mirror face extended from the upper end edge of the shade in a rear direction.

6. The lamp unit of a vehicle headlamp according to claim 4, wherein the plurality of second light emitting elements are arranged on an upper side of the optical axis and on a front side of the rear side focal face of the projecting lens.

7. The lamp unit of a vehicle headlamp according to claim 5, wherein the mirror member includes a downward directed inclined face extended from a front end edge of the upward directed mirror face of the mirror member in the rear direction to a skewed lower side; wherein the plurality of second light emitting elements are arranged on a rear side of the rear side focal face of the projecting lens and at a lower vicinity of the downward directed inclined face.

8. The lamp unit of a vehicle headlamp according to claim 7, wherein the downward directed inclined face of the mirror member is constituted as a mirror face.

9. The lamp unit of a vehicle headlamp according to claim 1, wherein the plurality of second light emitting elements are supported by a common metal made member.