Electron source with microtip emissive cathodes
AssigneeCommissariat a l'Energie Atomique
InventorRobert Meyer
Life of this patent
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Abstract
Electron source with microtip emissive cathodes having grating-like electrodes. These electrodes can either be cathode conductors (5) or grids (10). Specific application to the excitation of a display screen.
Claims17
An electron source comprising, on an insulating support (2, 4), a first series of parallel electrodes serving as cathode conductors and carrying a plurality of microtips (12) made from an electron emitting material and a second series of parallel electrodes (10) serving as grids and which are electrically insulated from the cathode conductors (5) and forming an angle therewith, an area of overlap between said first and second series of electrodes defining an intersection zone of the cathode conductors (5) and the grids (10), the latter having openings (14) respectively facing the microtips (12), wherein the cathode conductors (5) have a grating structure, said grating structure being in contact with a resistive coating (7) and defining grating meshes, said microtips (12) occupying central regions of said grating meshes.
An electron source comprising, on an insulating support (2, 4), a first series of parallel electrodes serving as cathode conductors and carrying a plurality of microtips (12) made from an electron emitting material and a second series of parallel electrodes (10) serving as grids and which are electrically insulated from the cathode conductors (5) and forming an angle therewith, wherein the grids (10) have a grating structure, said grating structure being in contact with a resistive coating (18) and defining grating meshes, said microtips (12) occupying central regions of the grating meshes.
An electron source comprising, on an insulating support (2, 4), a first series of parallel electrodes serving as cathode conductors and carrying a plurality of microtips (12) made from an electron emitting material and a second series of parallel electrodes (10) serving as grids and which are electrically insulated from the cathode conductors (5) and forming an angle therewith, wherein the grids (10) and the cathode conductors (5) each have a grating structure, each of said grating structures being in contact with a resistive coating (7, 18) and defining grating meshes, said microtips (12) occupying central regions of the grating meshes.
Dependencies are inferred from the claim text.