Patent ID: 8106574

Claim:
An electric bulb for use in a vehicular headlamp, comprising: a low-beam filament and a high-beam filament contained in a substantially cylindrical bulb, the low beam filament extending between a first low beam filament end and a second low beam filament end, and the high beam filament extending between a first high beam filament end and a second high beam filament end; a pair of first leads for the low-beam filament each having a side end and an opposite end, and the first low beam filament end and the second low beam filament end of the low-beam filament are connected and supported on the side end of the pair of first leads; a pair of secondary leads for the high-beam filament each having a secondary side end and a secondary opposite end, and the first high beam filament end and the second high beam filament end of the high-beam filament are connected and supported on a respective secondary side end of the pair of secondary leads; and a lead holder in which the opposite ends of the first leads and the secondary opposite ends of the secondary leads are held in line, wherein the low-beam filament is located in a first plane containing an optical axis located substantially on a same line as a longitudinal/central axis of the cylindrical bulb, and the low-beam filament extends in a direction substantially normal to the optical axis, wherein the high-beam filament is located in a second plane parallel with the first plane and the high beam filament extends substantially parallel with the low-beam filament, wherein the pair of first leads are located at positions sandwiched between the pair of secondary leads and are located substantially in the first plane and between the low-beam filament and the lead holder, wherein one of the pair of secondary leads is located in a third plane defined in parallel with the optical axis and substantially normal to the first plane, between the high-beam filament and the lead holder, another one of the pair of secondary leads is located in a fourth plane defined in parallel with the optical axis and substantially normal to the first plane, between the high-beam filament and the lead holder, wherein the pair of secondary leads are bent such that an entire area is surrounded by the low-beam filament, the high-beam filament, a first straight line from an inside edge of a right one of the side ends of the first leads to an inside edge of a right one of the secondary side ends of the second leads and a second straight line from an inside edge of a left one of the side ends of the first leads to an inside edge of a left one of the secondary side ends of the second leads, and contains neither a portion of the pair of first leads nor a portion of the pair of secondary leads in a view from a side of the low-beam filament and the high-beam filament toward the lead holder.