| 摘要 |
An X-ray source (1) and an X-ray tube (4) in which a section (42) for shielding the securing portion (W) of a target support (18) and a second end opening (34) is formed when viewed from a first end of a bulb (20). Consequently, discharge between the first end of the bulb (20) and the securing portion (W) can be suppressed. Since a second end of the bulb (20) is formed as a constricted portion (37) and the second end opening (34) of the bulb (20) is secured to the target support (18), the shapes of the bulb (20) and the shielding section (42) can be simplified compared with conventional X-ray tubes where an inner tube section is formed in the bulb. With such a simple constitution, the stability of the electric field in the bulb (20) is enhanced at the time of X-ray generating operation and discharge in the bulb (20) can be suppressed effectively.
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