| 摘要 |
A tipless discharge lamp of the short arc type in which on the outside surface of the arc tube there is no residual filling tube tip, and in which an exact distance between the electrodes is obtained is achieved in a metal halide lamp of the short arc type by a pair of electrodes being located in an arc tube, by the electrodes are parts of a one-piece electrode component that has been fracture-split so that, at least to some extent, fracture traces are present on the faces of these electrodes which have not undergone mechanical processing such as cutting, polishing, or the like, and elimination of the use of a filling tube, so that no residual filling tube tip projections remain on the outside surface of the arc tube. Furthermore, precise positioning of the pair of electrodes in the arc tube results from the hermetically sealed portion being drawn outwardly in the base area of at least one of the electrodes creating an area with a smaller diameter than the remainder of that hermetically sealed portion.
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