Patent ID: 6157130
Filing Date: 2000-12-05
Classification: H01J

Abstract:
A high pressure discharge lamp for an automobile, the lamp comprising a discharge chamber portion defining a discharge chamber filled with metal halide and rare gas, molybdenum foils, lead wires, a bulb, and a pair of opposing electrodes, each electrode including a portion projecting a predetermined distance into the discharge chamber, the bulb comprising:tapered portions tapering towards the discharge chamber;sealed ends, each sealed end having portions of a molybdenum foil, an electrode, and a lead wire disposed therein; andsealed portions, each sealed portion having a relatively smooth and continuous surface between the discharge chamber and a sealed end, and said tapered portions being positioned in the sealed portions,wherein the discharge chamber portion has a length greater than the distance between ends of the projecting portions of the electrodes in the discharge chamber and has an outer diameter that is constant along said length.