X-RAY TUBE

摘要

Provided is an x-ray tube capable of easily and stably performing a focus dimension variable control and a tube current control. The x-ray tube is equipped with a cathode (10) having a filament (11) and a trench portion (16) in which the filament (11) is housed. In the x-ray tube, the trench portion (16) has: a pair of first bottom surfaces (S1) having the same plane as a plane on which the filament (11) is positioned and sandvviching the filament (11) in the width direction (db) of the trench potion (16); and second bottom surfaces (S2) sandwiching the filament (11) and the pair of first bottom surfaces (S1) in the length direction (da) of the trench portion (16) and positioned on the more opening (16a) side of the trench portion (16) than the pair of first bottom surfaces (S1).