METHOD FOR MANUFACTURING A DOUBLE TUBE DISCHARGE LAMP

摘要

A method for manufacturing a discharge lamp comprising at least two tubes or bulbs is disclosed. The lamp is especially a high intensity discharge lamp for use for example in a head lamp of a vehicle, and comprises an inner tube or bulb for enclosing an arc discharge chamber and an outer tube or bulb (30) for sealingly enclosing the inner tube or bulb, wherein the inner volume of the outer tube or bulb (30) is evacuated or filled with a gas in an easy and reliable way by using at least one two-step pinching and/or roll-on process for fixation of both tubes at least at one of their axial ends, wherein in a first step the fixation is carried out in such a way that a passage (20) remains that runs in an at least substantially axial direction of the lamp between the inner volume of the outer tube (30) and the outside of the axial end (8) of the inner tube or bulb through which passage the inner volume is evacuated and/or filled with a gas, and wherein in a second step the passage is sealingly closed by carrying out a second pinching or roll-on process.