Patent ID: 8441190

Claim:
A vehicular discharge lamp that emits light by a DC lighting system, the vehicular discharge lamp comprising: an outer tube that is mounted on a socket; a light emitting tube that is disposed in the outer tube, and that includes a light emitting portion and a pair of fine tube portions connected to the light emitting portion on the opposite sides of the light emitting portion; a cathode-side electrode and an anode-side electrode that are disposed in the light emitting tube; two lead wires which are respectively connected to the cathode-side electrode and the anode-side electrode, wherein at least a part of each of the two lead wires is disposed in the outer tube; and one of a coated layer or a metal wire, wherein the coated layer is one of a metal film or a metal oxide, wherein the coated layer is applied only on an outer peripheral surface of the fine tube portion that is positioned on an anode side of the light emitting tube among the pair of tube portions, wherein the metal wire is wound only on the outer peripheral surface of the fine tube portions that is positioned on the anode side of the light emitting tube among the pair of fine tube portions, and wherein inert gas having negative pressure is filled in a space outside the light emitting tube in the outer tube.