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US 6,147,447 AGranted
Electronic gun for multibeam electron tube and multibeam electron tube with the electron gun
AssigneeThomson Tubes Electroniques
InventorsArmel Beunas, Georges Faillon
Life of this patent
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Abstract
The disclosure relates to electron guns comprising several electrodes, including a plurality of cathodes designed for the production, from an emissive face, of an electron beam each. Each of the cathodes is surrounded by a pole piece. This pole piece is designed to convey a magnetic flux close to the emissive face of the cathode. Application to longitudinal-interaction multibeam electron tubes.
Claims20
An electron gun comprising:
- a plurality of electrodes, including,
- a plurality of cathodes, each having an emissive face configured to produce an electron beam;
- and
- a plurality of pole pieces being made of a magnetic material,
- respective of the plurality of cathodes being surrounded by and in a vicinity of a corresponding one of the plurality of pole pieces and the corresponding pole piece being configured to convey a magnetic flux close to the emissive face of the respective cathode, wherein,
- magnetic flux lines of the magnetic flux conveyed by the corresponding pole piece substantially match an orientation of a path of electrons from the electron beam emitted by the emissive face of the respective cathode so as to focus the electron beam after emission.
3 more elements
A multibeam electron tube comprising:
- a body;
- a focusing device configured to surround the body;
- and
- an electron gun connected to the body comprising,
- a plurality of electrodes, including,
- a plurality of cathodes, each having an emissive face configured to produce an electron beam, and
- a plurality of pole pieces being made of a magnetic material,
- respective of the plurality of cathodes being surrounded by and in a vicinity of a corresponding one of the plurality of pole pieces and the corresponding pole piece being configured to convey a magnetic flux close to the emissive face of the respective cathode, wherein,
- magnetic flux lines of the magnetic flux conveyed by the corresponding pole piece substantially match an orientation of a path of electrons from the electron beam emitted by the emissive face of the respective cathode so as to focus the electron beam after emission.
6 more elements
Dependencies are inferred from the claim text.