Patent ID: 7460645

Claim:
An X-ray tube comprising: a cylindrical vacuum envelope including a first outer casing member formed at one end of the cylindrical vacuum envelope and provided with an output window through which X-rays pass, and a second outer casing member formed at the other end of the cylindrical vacuum envelope and having electrically insulating characteristics; an anode target arranged inside the first outer casing member; a cathode arranged inside the first outer casing member for releasing electrons to the anode target; a supporting member arranged inside the cylindrical vacuum envelope, with a gap provided between the supporting member and an end portion of the second outer casing member, and having one end of the supporting member provided with an attachment portion for being attached to an inner surface of a cylindrical portion of the second outer casing member and the other end of the supporting member being smaller in diameter than said one end of the supporting member and supporting the anode target; a terminal provided in the end portion of the second outer casing member, substantially thermally separated from the supporting member by way of the gap and arranged for supplying a voltage to the supporting member; an insulating mold resin which covers an outer periphery of the terminal; and a connecting portion for electrically connecting the supporting member to the terminal.