Bearing and rotary anode X-ray tube employing the bearing

Details Bearing and rotary anode X-ray tube employing the bearing Bearing and rotary anode X-ray tube employing the bearing

1989-07-06

1992-09-22

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378133, 384492, H01J 3510

Patent

active

051503980

ABSTRACT:
A rotary anode X-ray tube comprises a cathode for emitting electrons in a vacuum vessel, an anode target with which the electrons emitted from the cathode collide to generate X-rays, a rotor fixed integrally with the anode target, and a plurality of bearings for rotatably supporting the anode target. Frictional surfaces of at least one of the bearings that is located in the vicinity of the anode target are coated with lubricant that demonstrates low vapor pressure at high temperatures. Main component of the lubricant is one of tin, aluminum and indium. Mother material of at least one of the bearings is ceramics.

REFERENCES:
patent: 2570770 (1951-10-01), Combee
patent: 2754168 (1956-07-01), Atlee
patent: 3929396 (1975-12-01), Orkin et al.
patent: 4326144 (1982-04-01), Appelt
patent: 4357555 (1982-11-01), Gerkema et al.
patent: 4641332 (1987-02-01), Gerkema
patent: 4956858 (1990-09-01), Upadhya
Atlee et al., "Lubrication in Vacuum by Vaporized Thin Metallic Films", Journal of Applied Physics, vol. 11, No. 9, 611-615, 1940.

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