A field emission cathode and methods in the production thereof

H - Electricity – 01 – J

Patent

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Details

H01J 1/30 (2006.01) H01J 1/304 (2006.01) H01J 9/02 (2006.01)

Patent

CA 2212681

An improved field emission cathode and methods for fabricating such a cathode are disclosed. In the methods of the invention, the field emission cathode is made from at least one body containing a first substance. The method steps include a preparation of irregularities in an emitting surface of the body, adding to the emitting surface of the body ions of a second substance with a low work function, and modifying the emitting surface by inducing field emission in applying a variable electric field to the body and increasing the field strength in steps.

L'invention concerne une cathode à émission de champ qui est améliorée, ainsi que des procédés pour fabriquer une telle cathode. Selon les procédés de l'invention, la cathode à émission de champ est faite avec au moins un corps contenant une première substance. Le procédé consiste à préparer des irrégularités dans une surface d'émission du corps, à ajouter à la surface d'émission du corps des ions d'une seconde substance avec une fonction de travail faible et à modifier la surface émettrice en induisant une émission de champ par l'application d'un champ électrique variable au corps, en augmentant la force du champ par étapes.

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