X-ray tube

Details X-ray tube X-ray tube

1985-06-12

1987-07-07

Howell, Janice A.

X-ray or gamma ray systems or devices

Source

Electron tube

378135, 378136, H01J 3504, H01J 3510

Patent

active

046792198

ABSTRACT:
An X-ray tube is disclosed, which comprises an evacuated envelope having a cathode assembly and an anode assembly provided at the opposite ends of the envelope such that they face each other. The cathode assembly includes a spiral filament for generating an electron beam with a beam axis. One of the terminal ends of the spiral filament is located in the proximity of the center thereof. The anode assembly includes a conical target with a tip corresponding to the beam axis, for radiating X-rays in all directions. When a current flows with the filament of the X-ray tube, the temperature of the filament is reduced for a central portion thereof to reduce the density of electrons emitted from the central portion, thus preventing overheating of the tip of the conical target.

REFERENCES:
patent: 1715151 (1929-05-01), Ulrey et al.
patent: 1992975 (1935-03-01), Ulrey
patent: 3296476 (1967-01-01), Hofmann
patent: 3517195 (1970-06-01), Leavitt
patent: 3591821 (1971-07-01), Seki et al.
patent: 3714487 (1973-01-01), Jacob
patent: 4563769 (1986-01-01), Madsen

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