Patent ID: 7127035
Filing Date: 2006-10-24
Classification: F16C,H01J

Abstract:
1. A rotary anode type X-ray tube, comprising: a vacuum vessel; an anode target disposed in the vacuum vessel and having a through hole; and a rotating mechanism rotatably supporting the anode target, the rotating mechanism comprising a rotary body having a cylindrical shape and connected to the anode target and a stationary body fitted in the rotary body and having a passage for flowing a cooling medium therein, wherein the rotating mechanism has a first area and a second area in an axial direction, the first area where the rotary body and the stationary body are mutually opposed with a first gap therebetween and dynamic pressure type sliding bearings are disposed and the second area where the rotary body and the stationary body are mutually opposed with a second gap larger than the first gap therebetween and filled with a liquid metal lubricant, and a portion of the second area is inserted into the through hole of the anode target to form an anode target supporting section surrounded by the through hole, wherein the passage for flowing a cooling medium is formed in at least the stationary body of the anode target supporting section in the second area, and the first area is connected to the second area in an axial direction in turn, and the rotary body in the second area has a heat transfer path formed of a metal having a high melting temperature of Mo or a Mo alloy at least at an outside thereof in a radial direction such that heat produced in the anode target transfers through the rotary body in the second area.