| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotational anode type X-ray tube that can be increased in lifetime.SOLUTION: A rotational anode type X-ray tube comprises: a fixing shaft having a first face intersecting to a direction parallel to a rotating shaft; and a rotor which is supported by a dynamic pressure bearing having lubricant oil filled in the gap between the bearing and the fixing shaft. The rotor contains: a first cylinder having a second face intersecting to a direction parallel to the rotating shaft; a second cylinder which contacts the second face and faces the first face through the lubricant oil; and a third cylinder which is located at the opposite side to the first face and the second face through the second cylinder. A first screw part provided to the inner surface of the first cylinder and a second screw part provided to the outer peripheral surface of the third cylinder are fastened to each other to fix the third cylinder to the first cylinder, and a screw member is screwed into a third screw part provided to the inner peripheral surface of a hole penetrating through the second cylinder in a direction parallel to the rotating shaft, thereby pressing the tip portion of the screw member against the second face of the second cylinder.SELECTED DRAWING: Figure 2 |
