| 摘要 |
An x-ray tube has an evacuated housing with a cathode and a rotating anode therein, the rotating anode including a drive shaft normally supported during operation by a magnetic bearing arrangement, but having mechanical bearings attached to the housing by which the shaft is supported if the anode "drops" during operation. A disengageable contact is provided which, when closed, completes a circuit for supplying high voltage to the anode. A displaceable actuator extends into the evacuated housing for making and breaking the contact, the actuator being sealed air-tight within the housing by a spring bellows. The actuator has a guide element disposed outside of the evacuated housing, which permits the guide element to be lubricated as needed. A locking element is provided which is engageable with the guide element to hold the anode shaft, and thus the anode, in place against the mechanical bearings during transport of the x-ray tube.
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