Patent ID: 8262428

Claim:
A method for manufacturing a discharge lamp comprising at least a first inner tube and a second outer tube, which encloses an inner volume and the inner tube, wherein the method further includes: 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 is formed that runs in an at least substantially axial direction of the lamp between the inner volume of the second outer tube and the outside of the lamp, through which passage the inner volume is evacuated and/or filled with a gas, wherein the first step forming said passage is carried out by means of first pinching or roll-on blocks enclosing an opening that extends with its area asymmetrically or symmetrically into halves of the blocks providing room for formation of said passage between said second outer tube and said first inner tube, and wherein in a second step the passage is sealingly closed by carrying out a second pinching or roll-on process.