ELECTRON GUN, FIELD EMISSION NEGATIVE ELECTRODE ELECTRON GUN, AND MICROWAVE TUBE

Japanese Patent JP3282602

B2

PROBLEM TO BE SOLVED: To restrict the periodic expansion of the electron beam in the continuous periodic magnetic field by providing magnets for forming a magnetic field in parallel with a negative electrode and the center axis of an electrode while using the negative electrode magnetic flux density having the minimum value at the maximum value of the beam radius of the electron beam occupying the predetermined ratio of the current among the whole current forming the electron beam.
SOLUTION: Negative voltage is applied to a negative electrode substrate 2, and positive voltage in relation to the negative electrode 1 is applied to a positive electrode 8, and positive or negative voltage in relation to the negative electrode substrate 2 is applied to a Wehnelt electrode 7. In this condition when the positive voltage applied between the negative electrode substrate 2 and a gate electrode 5 is increased, electron is emitted from an emitter 6. The electron emitted from multiple emitters 6 is focused for acceleration by an electric field and a magnetic field in an electron gun area, and formed into the narrow electron beam 10 so as to pass through an opening of the positive electrode 8. The electron beam 10 is focused to the narrow electron beam and maintained by the periodic magnetic field formed by magnets 11 and pole pieces 12.

Hideo Makishima

JP145899A

May 20, 2002

January 06, 1999

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NEC

H01J23/06; H01J3/02; H01J23/087; H01J25/34; (IPC1-7): H01J23/087; H01J3/02; H01J23/06; H01J25/34

JP200076987A
JP2000123715A

Shiroyuki Hori

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