| 摘要 |
An x-ray tube ( 1 ) irradiates an electron beam from a cathode ( 18 ) to impact a target ( 36 ) and emit x-rays. When the x-ray tube ( 1 ) operates, the magnet portion ( 40 ) is rotated every fixed time period and positioned at a prescribed rotation position. Due to the rotation of the magnet portion ( 40 ), the magnetic field formed by the permanent magnets ( 42 ) changes and the irradiation position on the target ( 36 ) of the electron beam moves. As a result, the electron beam is irradiated at a new position on the target ( 36 ) and the same amount of x-ray as the initial performance is generated.
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