Patent ID: 11875965
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An X-ray tube, comprising:
an electron gun unit that emits electrons;
a target that generates X-rays due to incidence of the electrons; and
a vacuum housing unit in which the electron gun unit and the target are housed,
wherein the vacuum housing unit has a metal housing unit for supporting the target and a bulb unit formed of an insulating material and connected to the metal housing unit,
the electron gun unit has a focusing electrode portion at an end portion on an emission side of the electrons, the focusing electrode portion having a tubular shape for focusing the emitted electrons, and at least a part of the focusing electrode portion is supported by the bulb unit so as to be located in the metal housing unit such that the metal housing unit extends to the location of the focusing electrode portion,
when viewed from an X-ray generation position on the target, the focusing electrode portion blocks a line of sight from the X-ray generation position to the bulb unit,
the focusing electrode portion has a protruding portion that protrudes outward,
a portion of the focusing electrode portion in which the protruding portion is provided is located in the metal housing unit,
the protruding portion protrudes toward the metal housing unit to reduce a space between the metal housing unit and the focusing electrode portion, and
the focusing electrode portion includes a tubular portion, and the protruding portion provided on an outer peripheral surface of the tubular portion and being thicker than the tubular portion by thickening a material of a wall forming the tubular portion along a segment of the tubular portion.