Electron gun
AssigneeNEC Network and Sensor Systems, Ltd.
InventorAkira Chiba
Life of this patent
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Abstract
To suppress both influence of electron emission from a cathode side surface and consumption of energy to be supplied to a heater, while being provided with a grid, an electron gun of the present invention includes: a cathode capable of emitting electrons by heating; a grid capable of controlling the electron emission; and a cathode shield which is an conductor including a material portion located in the vicinity of a side surface of the cathode and facing at least a portion of the side surface via a gap or a heat insulating material, and not being made in direct physical coupling nor in direct physical contact with the cathode.
Claims20
An electron gun comprising:
- a cathode capable of emitting electrons by heating;
- a grid capable of controlling the electron emission;
- and
- a cathode shield being an electricity conductive material, the conductor including a material portion located in the vicinity of a side surface of the cathode and facing at least a portion of the side surface via a gap or a heat insulating material, the conductor not being made in physical coupling nor in physical contact with the cathode.
Dependencies are inferred from the claim text.