| 摘要 |
To provide for improved light distribution of a vehicular headlight furnishing both depressed-beam and high-beam illumination, a shadow cap (9, 25) partly surrounds a main light source located in a reflector (2) which has two segments (14, 15) of different contours. The first one (14) of the reflector segments is optically associated with the main light source furnishing depressed-beam illumination, and this segment has a free-formed surface reflection contour. A second segment of the reflector is optically associated with an auxiliary light source (8, 18) which is shaded by a shadow cap. The shadow cap (9, 25) provides a shadow angle of between 100.degree. and 140.degree. with respect to light emitted from the main light source (7) to define a shadow zone (12) and a light zone (13) on the reflector. The shadow cap is shaped and positioned with respect to the auxiliary light source such that the auxiliary light source is located within the shadow zone (12). The auxiliary light source is located by an offset of between 0.25 and 2 times below the optical axis (A) of the reflector, and the spatial distribution of the segments is such that the reflector is associated with a light zone and a shadow zone, respectively, as formed by the shadow cap. For high-beam illumination, both the auxiliary light source and the main light source, typically filaments of a halogen incandescent lamp, are energized, so that the respective illuminations are superposed, providing spread-out illumination from the main light source (7) and somewhat diffused spread illumination as well as a concentrated beam from the auxiliary light source (8, 18). |
