Vehicular headlamp

Abstract

A vehicular headlamp 1 including a projection lens 16 installed on the optical axis Ax extending in the longitudinal direction of the vehicle a light source 12a provided behind the rear side focal point F of the projection lens 16, and a reflector 14 that reflects direct light from the light source 12a forward and toward the optical axis Ax; and in this headlamp, an additional lens 30, which deflects and directs light from the light source 12a to the front is provided around the outer perimeter of the projection lens 16, and grooves 33, which have side faces that direct at least a part of the incident light toward the side of the vehicle, are formed in the outer surface of the additional lens 30.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a vertical cross-sectional view of the vehicular headlamp according to one embodiment of the present invention;

FIG. 2 is a front view of the lamp unit of the vehicular headlamp shown in FIG. 1;

FIG. 3 is a horizontal sectional view of the lamp unit of the vehicular headlamp shown in FIG. 1;

FIG. 4 is a diagram showing in perspective a light distribution pattern formed by light that is radiated forward from the vehicular headlamp shown in FIG. 1 on an imaginary vertical screen approximately 25 meters in front of the lamp:

FIG. 5 is a front view of the additional lens used in the vehicular headlamp according to the present invention;

FIG. 6 is an enlarged perspective view of the additional lens shown in FIG. 5;

FIG. 7 is an explanatory diagram of the light transmission occurring in the convex portion of the additional lens, being a cross section taken along the line 7-7 in FIG. 6;

FIG. 8 is an explanatory diagram of the light transmission occurring in the convex portion of the additional lens, being a cross section taken along the line 8-8 in FIG. 6; and

FIG. 9 is a vertical cross-sectional view of a conventional vehicular headlamp.

Claims

1. A vehicular headlamp comprising in a lamp chamber formed by a lamp body and a front cover, a projection lens installed on an optical axis extending in a longitudinal direction of a vehicle,a light source provided on a rear side of a rear side focal point of the projection lens, anda reflector for reflecting direct light from the light source forward and toward the optical axis; and further comprising:an additional lens provided on at least a part of a circumference of the projection lens so as to deflect and direct light from the light source forward; anda deflecting portion formed on the additional lens so as to direct at least a part of incident light toward a side of the vehicle.

2. The vehicular headlamp according to claim 1, wherein: the deflecting portion is comprised of a side face of a groove formed in an outer surface of the additional lens.

3. The vehicular headlamp according to claim 1, wherein: the deflecting portion is comprised of a side face of a convex portion formed on an outer surface of the additional lens.

4. The vehicular headlamp according to claim 1, wherein: the deflecting portion is comprised of a side face of a raised portion formed on an outer surface of the additional lens.

5. The vehicular headlamp according to claim 1 wherein: a part of the deflecting portion is comprised of a totally reflective face for directing a part of the incident light upward.