Patent ID: 6449339
Filing Date: 2002-09-10
Classification: H01J

Abstract:
A rotary anode type X-ray tube having an axis of rotation, comprising:a rotary anode disk including a target region for emitting an X-ray; a substantially columnar stator; a cylindrical first rotor coupled around said stator and supporting said rotary anode disk; a hydrodynamic slide bearing region including a spiral groove and arranged between the stator and said first cylindrical rotor; and a cylindrical second rotor arranged coaxial with and outside the first cylindrical rotor with a gap for the heat insulation provided therebetween and bonded directly or indirectly to the rotary anode disk, said second cylindrical rotor being bonded to said first cylindrical rotor in an open region positioned remote from the rotary anode disk in terms of the heat transmission route; wherein a plurality of slits extending substantially along the axis of rotation are formed apart from each other in the circumferential direction in that region of said second cylindrical rotor which is bonded to said first cylindrical rotor.