Cathode with fast heat switch-on and switch-off mechanism and grid-type electron tube including such a cathode
AssigneeThomson Tubes Electroniques
InventorsMichel Langlois, Robert Frossard
Life of this patent
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Abstract
An electron tube cathode has a hollow cylindrical structure formed by thermo-emissive wires mounted between two conductive supports. The two supports are mechanically fixed to each other. To prevent the deformation of the cathode when the heating is turned on and turned off, at least one spring is used, this spring being integrated with one of the supports and being placed in the vicinity of the thermo-emissive wires. The spring is made of a material possessing elastic properties which, at ambient temperature, are lower than or equal to the properties that it has at a temperature greater than ambient temperature.
Claims15
A cathode for an electron tube having a hollow cylindrical structure, comprising:
- thermo-emissive wires mounted between two conductive supports, these supports being mechanically fixed to each other;
- and
- at least one spring proximal to the wires and integrated with one of the supports to neutralize the tensile and compressive stresses in the wires, wherein each of said at least one spring is made of graphite.
Dependencies are inferred from the claim text.