Electron tube with axial beam and pyrolitic graphite grid
AssigneeThomson Tubes Electroniques
InventorGuy Clerc
Life of this patent
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Abstract
A grid for an electron tube with an axial beam which includes an apertured part through which the electrons of the beam are intended to pass. The grid is in the form of a bell and is made of a single material. The apertured part is located at the top of the bell but is placed in the bottom of a hollow so that the electrons passing through the grid around its periphery are focused onto the axis. Such a grid may find particular application to IOT-type tubes.
Claims12
An electron tube with an axial beam, comprising, in a vacuum envelope, an electron gun for creating and modulating an electron beam directed in a forward direction, said electron gun having a front part and a rear part, said front part comprising an emissive cathode and an apertured portion of a grid, and said rear part comprising a heater for heating the cathode, said rear part being located behind the cathode when looking in said forward direction, said grid being made from a pyrolitic graphite single material and having an axial tubular skirt extending in a rearward direction opposite said forward direction until behind the front part of the electron gun, and said tubular skirt being fixedly mounted on an electrically conductive metallic grid support, said metallic grid support located backwards from said front part when looking in said forward direction.
Dependencies are inferred from the claim text.