X-ray tube device

Details X-ray tube device X-ray tube device

1986-07-18

1988-10-11

Howell, Janice A.

X-ray or gamma ray systems or devices

Source

Electron tube

378136, 378113, H01J 3514

Patent

active

047776420

ABSTRACT:
An X-ray tube has a cathode assembly for emitting an electron beam and an anode target facing this assembly in an evacuated envelope. The anode target defines a target surface that is slightly inclined to the electron beam axis and the direction in which it is inclined coincides with an X-ray irradiation direction. The cathode assembly comprises a flat cathode with a flat electron emission surface and a focussing electrode which focuses electrons emitted by the cathode. The cathode's electron emission surface is elongated and its long axis is coincident with the direction of X-ray irradiation. The focussing electrode possesses an axially symmetric opening with generally the same dimensions lengthways and crosswise. This gives an X-ray tube device in which the shape of the X-ray focal spot seen looking from the X-ray irradiation direction is substantially that of a circle or of a polygon, including a square, and it is possible to vary the size of the X-ray focal spot over a wide range while maintaining its long to short side ratio at 1.4 or less.

REFERENCES:
patent: 4126805 (1978-11-01), Randall
patent: 4698835 (1987-10-01), Ono et al.

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