| 摘要 |
An x-ray tube has a cathode head for focusing an electron beam directed at an anode. The cathode head is made of ferromagnetic material having a Curie point above 700 DEG C. and is mounted on a supporting element to the tube envelope via a direct metallic connection in the form of soldering or welding. The combination of the high Curie point and the direct metallic connection provide good heat transfer such that the Curie point is not exceeded so that the cathode head always remains ferromagnetic. The cathode head thus always operates in a predictable manner and no movement of the focus by magnetic fields occurs.
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