Patent ID: 7058161

Claim:
An X-ray tube for impinging electrons emitted from an electron generating unit on a target and outputting an X-ray, comprising: an envelope main body having an accommodation portion for accommodating said electron generating unit; an insulating bulb joined to said envelope main body at one end side of said bulb and having an inner cylinder portion extending inwardly at the other end side of said bulb; a metal tube having an extension fuse-bonded to the inner cylinder portion on the outer periphery of one end side of said metal tube and projecting outwardly from said bulb through said inner cylinder portion at the other end side of said metal tube; and a target supporter supporting a target at one end side of said target supporter with the other end side of said target supporter being inserted through said metal tube and welded to an end portion of said metal tube projecting outside of said bulb; wherein the X-ray tube comprises an abutting portion between the metal tube and the target supporter which is located outside the bulb.