Patent ID: 6630770
Filing Date: 2003-10-07
Classification: F21S,H01K

Abstract:
A light source bulb in an automotive headlamp, said automotive headlamp having a lamp chamber defined by a lamp housing and a lens, said lamp chamber having a reflector and said light source bulb arranged therein,said reflector having a reflecting surface constituted by a complex reflecting surface, said light source bulb having a high-beam filament arranged obliquely below and behind with respect to a low-beam filament, a first lead wire extended from a front end of said low-beam filament being supported by a first support wire, a second lead wire extended from a rear end of said low-beam filament being supported by a second support wire, a third lead wire extended from a rear end of said high-beam filament being supported by said second support wire, a fourth lead wire extended from a front end of said high-beam filament being supported by a third support wire, a prescribed low beam distribution pattern being formed by entire-surface reflection light distribution control of said reflecting surface when said low-beam filament is lit, a prescribed high beam distribution pattern being formed by the entire-surface reflection control of said reflecting surface when said high-beam filament is lit, wherein said light source bulb is used for right traffic and for left traffic, at least one of said lead wires and said support wires situated below said low-beam filament lies in a shading coverage of said high-beam filament when said low-beam filament is lit; and wherein said second support wire is, in a side view of said light source bulb, bent to rearward of the rear end of said high-beam filament and positioned above the lower end of said low-beam filament such that no portion of the second support wire is located below the lower end of the low-beam filament.