Patent ID: 7983395

Claim:
A rotation anode electron tube comprising: an anode target which generates X-rays due to electrons being incident; an electron emitting source which emits electrons to be incident into the anode target; a recoil electron capturing structure comprising: a first member, which surrounds an orbit of the electrons heading from the electron emitting source toward the anode target and captures electrons emitted from the electron emitting source and recoiled on the anode target, the first member being in a ring shape, formed from an oxide-dispersion-strengthened copper having a crystal orientation throughout the first member that is parallel in one specified direction that is perpendicular to an axial direction of the recoil electron capturing structure, the first member being exposed on an inside surface thereof such that the crystal orientation substantially inhibits crack propagation from the inside surface in a radial direction of the first member; and a second member formed from pure copper having random crystallinity, the second member being positioned outside the first member along a radial direction; and a vacuum envelop which keeps at least a periphery of the anode target, the electron emitting source, and the recoil electron capturing structure at a predetermined degree of vacuum.