X-ray tube and method of controlling X-ray focal spot using the same

摘要

An X-ray tube is provided. The X-ray tube includes a cathode electrode which is disposed in one end of a vacuum container and includes an emitter emitting an electron; a gate electrode which is disposed in the vacuum container to be adjacent to the cathode electrode; an anode electrode which is disposed in the vacuum container of the other end of a direction in which the vacuum container extends and inclines with respect to the cathode electrode; and a focusing electrode which is disposed in the vacuum container along an inner circumference surface of the vacuum container between the gate electrode and the anode electrode. The focusing electrode has an opening of which a plan cross section has a maximum width and a minimum width different from each other.

主权项

1. An X-ray tube comprising:
a cathode electrode disposed in a first end of a vacuum container and including an emitter emitting an electron; a gate electrode disposed in the vacuum container and adjacent to the cathode electrode; an anode electrode disposed in a second end of the vacuum container and inclined, at a point where the electron collides with the anode electrode, along an inclined direction with respect to the cathode electrode; a focusing electrode disposed in the vacuum container along an inner circumference surface of the vacuum container between the gate electrode and the anode electrode; and an opening formed in the focusing electrode, wherein a plan cross section of the opening has a maximum width in the inclined direction and a minimum width different from the maximum width, and wherein the plan cross section of the opening has an elliptical shape.