Emitter-cup cathode for high-emission x-ray tube

Details Emitter-cup cathode for high-emission x-ray tube Emitter-cup cathode for high-emission x-ray tube

1997-08-18

1999-05-25

Church, Craig E.

X-ray or gamma ray systems or devices

Source

Electron tube

378119, H01J 3506

Patent

active

059075953

ABSTRACT:
An x-ray tube has at least one approximately planar electron emitter and an emitter-cup cathode configured to provide an electron beam of substantially greater perveance and beam compression ratio than otherwise obtainable with conventional cathode designs. The cup is optimized for use in a line-focus, planar-anode tube and has a slot in which the emitter is situated, an adjacent face region which is planar and angled so as to properly form the initial electron beam, a recess to allow the initial electron beam to be accelerated without significant shaping, and an overhanging portion which completes the electron beam forming.

REFERENCES:
patent: 4205254 (1980-05-01), Kanai
patent: 4344011 (1982-08-01), Hayashi et al.
patent: 4868842 (1989-09-01), Dowd
patent: 4894853 (1990-01-01), Dowd
patent: 5060254 (1991-10-01), de Fraguier et al.
patent: 5617464 (1997-04-01), Mika et al

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