Patent ID: 6477236
Filing Date: 2002-11-05
Classification: H01J

Abstract:
An X-ray tube of a rotary anode type, comprising:a disc-like rotary anode for emitting an X-ray upon irradiation with an electron beam; a cylindrical rotor mechanically joined to said rotary anode; a columnar stationary structure having an axis, inserted into the inner space of said rotor and provided with a lubricant storage chamber formed in said stationary structure along the axis thereof, and a hole formed in said stationary structure and extending along the axis thereof; a slide bearing of a dynamic pressure type formed between the rotor and the stationary structure and having a metal lubricant, which is in the form of a liquid at least during operation of the X-ray tube, supplied thereto; a vacuum vessel receiving said rotary anode, said rotor and a part of said stationary structure; and a heat transfer rod having a heat conductivity higher than that of the stationary structure inserted into the hole and tightly fitted in the hole to form an integral structure.