Patent ID: 7128455
Filing Date: 2006-10-31
Classification: F21S,F21V

Abstract:
1. A vehicular headlamp, which is structured to radiate light to form a low-beam distribution pattern, comprising: a projection lens that is disposed on an optical axis that extends in a vehicular longitudinal direction, a light source that is disposed on a rear side of a rear side focal point of the projection lens, a reflector that reflects light from the light source in a forward direction toward the optical axis, and a shade that blocks a portion of the light reflected from the reflector and is disposed in the proximity of the rear side focal point such that an upper end edge of the shade is positioned in the proximity of the optical axis, wherein: the light source is structured as a line segment light source that extends in a bulb central axis direction, by a light source bulb which has a light-emitting portion and is fixedly mounted on the reflector from a side of the optical axis in a position below the optical axis; and a shape of a reflective surface of the reflector in a vertical cross section that includes the optical axis is defined by a curve, which is formed such that a normal line of each point of the reflective surface is positioned between a bisector of a line segment that joins each of the points with the light source and a line segment that joins each of the points with the upper end edge of the shade, and a bisector of a line segment that joins each of the points with the light source and a line segment that joins each of the points with an upper end edge of a rear surface opening of the projection lens.