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US 5,204,890 AGranted
Rotary anode type X-ray tube
AssigneeKabushiki Kaisha Toshiba
InventorsHidero Anno, Katsuhiro Ono, Hiroyuki Sugiura, Takayuki Kitami, Hideo Yagoshi, Murashi Shinto
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Abstract
A rotary X-ray tube of the anode type wherein at least one of bearing surfaces which are partly formed on rotary and stationary structures is made of ceramics whose main component is the nitride, boride or carbide of at least one of those deviation metals, except chromium, which belong to a group IVA, VA or VIA element of a period 4, 5 or 6 of the Periodic Table.
Claims4
A rotary anode type x-ray tube comprising:
- an anode target;
- a rotary structure having one end to which the anode target is fixed;
- a stationary structure for holding the rotary structure;
- a sliding bearing section including bearing surface which are partly formed on the rotary and stationary structures and provided with spiral grooves formed thereon and a bearing gap between the bearing surfaces of the rotary an stationary structures;
- and
- a metal lubricant for allowing the rotary structure to be smoothly rotated, applied to the bearing gap and kept liquid when the x-ray tube is operated;
- wherein the bearing surface or surfaces of at least one of the rotary and stationary structures are made of ceramics whose main component is the carbide, boride or nitoride of at least one of those transition metals, except chromium, which belong to a Group IVA, VA or VIA of a period 4, 5 or 6 of the Periodic Table.
4 more elements
Dependencies are inferred from the claim text.