Patent ID: 6583564
Filing Date: 2003-06-24
Classification: F21S,H01J

Abstract:
A discharge lamp comprising: an arc tube having a discharge space in which a pair of electrodes having tips facing with each other are arranged; an outer tube enclosing the arc tube; a base that fixes one side of the outer tube; and two band-shaped light-intercepting films extending on a surface of the outer tube in a direction of an axis of the arc tube and in parallel with each other, the two band-shaped light-intercepting films having at least a portion overlapping both ends of the discharge space when viewing the outer tube in a direction perpendicular to an axis of the arc tube, wherein:when the tip of the electrode that is furthest from the base is determined as a basis position, in at least one of the two band-shaped light-intercepting films, an extending portion is formed at a location further from the base than the basis position and extends in a circumferential direction of the outer tube.