X-ray tube of rotary anode type

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 and one end, inserted into said rotor and provided with a lubricant storage chamber formed in said stationary structure along the axis thereof and a hole opened at the one end of the stationary structure and extending in said stationary structure from the one end of the stationary structure along the axis;
• 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 the one end of said stationary structure being located outside of said vacuum envelope;
• and
• a heat transfer rod having a heat conductivity higher than that of the stationary structure fitted into the hole and integrally bonded to the stationary structure.

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 said rotor including an inner cylindrical structure and an outer cylindrical structure coaxially arranged around the inner cylinder;
• a columnar stationary structure inserted into said rotor and having a lubricant storage chamber formed along the axis thereof;
• a slide bearing of a dynamic pressure type formed between the inner cylindrical structure of said 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 member having a heat conductivity higher than that of the inner cylindrical structure, arranged around the inner cylindrical structure in a cylindrical form and is bonded to the outer circumferential wall of the inner cylindrical structure.

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 ,said rotor including an inner cylindrical structure and an outer cylindrical structure coaxially arranged around the inner cylinder;
• a columnar stationary structure having an axis and one end, inserted into said rotor and provided with a lubricant storage chamber formed in the stationary structure along the axis thereof, and a hole formed in said stationary structure and extending in said stationary structure from the one end of the stationary structure along the axis;
• a slide bearing of a dynamic pressure type formed between the inner cylindrical structure of said 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, the one end of said stationary structure being located outside of said vacuum envelope;
• 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 with said stationary structure, a rotor formed of a plurality of cylindrical structures, and a heat transfer member having a heat conductivity higher than that of an inner cylindrical structure, arranged around the inner cylindrical structure in a cylindrical form and is bonded to the outer circumferential wall of the inner cylindrical structure.

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 inserted into the inner space of said rotor and having a lubricant storage chamber formed along the axis thereof said stationary structure including first and second portions integrally joined to each other, the first portion of a stationary structure formed of a predetermined first material, the second portion being positioned farther from the rotary anode than the first portion of the stationary structure and formed of a second material having a heat conductivity higher than that of the first material;
• a slide bearing of a dynamic pressure type formed between the rotor and the first portion of said 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;
• and
• a vacuum vessel having said rotary anode , said rotor and a part of said stationary structure housed therein;
• wherein a first portion of a stationary structure in which a slide bearing of a dynamic pressure type is arranged is formed of a predetermined first material, a second portion positioned farther from the rotary anode than the first portion of the stationary structure is formed of a second material having a heat conductivity higher than that of the first material, and the first portion and the second potion are integrally joined to each other.