Patent ID: 8182305

Claim:
A method for manufacturing a high pressure discharge lamp which uses, as a light source, a bulb made of fused quartz and including a tungsten electrode, and which is installed horizontally when the lamp is driven for actual use, the manufacturing method comprising the steps of: (A) preparing the bulb; (B) initially driving the bulb so that a tungsten residue adheres to a lowermost portion in the bulb; and (C) attaching the bulb to a reflector having a predetermined vertical axis for actual use, wherein the step (A) includes forming a first mark in a sealing part of the bulb, the step (B) comprises performing the driving while an optical axis of the bulb is set horizontally, and while the first mark is fixed at a position which is on a plane perpendicular to the optical axis and which is located in a lateral direction from the optical axis, wherein the lateral direction is at an angle of 45° or more and 135° or less with respect to the vertical direction, and the step (C) includes the step of (c1) mounting the bulb onto the reflector in a manner that the first mark is located on the vertical axis in order that the tungsten residue adhered by the step (B) is located in the lateral direction.