| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray tube of an X-ray fluoroscope with an area (a volume) breaking vacuum made as little as possible, in exchanging components such as a target and an aperture. SOLUTION: The X-ray tube is provided with a filament 1 emitting electron beams, a grid electrode 2, an anode 3 accelerating the electron beams emitted, a magnetic field lens 5 focusing the electron beams, a target 6 fitted on an X-ray transmission window and an aperture 7 arranged at a lower part of the target, with a periphery of the filament 1 and a periphery of the electron beam line 9 from the filament 1 over to the target 6 maintained in a high vacuum state. A shutter 15 capable of opening and closing for partitioning a vacuum space of the electron beam line 9 is provided at an intermediate part of the electron beam line 9 from the anode 3 to the target 6, and further, a degassing valve 20 is provided for releasing the vacuum space at the target side partitioned by the shutter 15 to the atmosphere. COPYRIGHT: (C)2009,JPO&INPIT
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