Field emission cold cathode

H - Electricity – 01 – J

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H01J 1/304 (2006.01) H01J 9/02 (2006.01) H01J 23/04 (2006.01)

Patent

CA 2492853

A field emission cold cathode (11) for use in vacuum tubes. A carbon velvet material (25) is comprised of high aspect ratio carbon fibers embedded perpendicular to a base material. The tips and/or the shafts of the carbon velvet material (25) are coated with a low work function cesiated salt. The base material of the carbon velvet material (25) is bonded to a cathode surface (27). The cold cathode (11) emits electrons when an electric field is applied, even at operating temperatures less than 900°C.

L'invention concerne une cathode froide (11) à émission de champ utilisée dans des tubes à vide. Un matériau de velours de carbone (25) est constitué de fibres de carbone à facteur de forme élevé intégrées perpendiculairement à un matériau de base. Les pointes et/ou les axes du matériau de velours de carbone (25) sont revêtus d'un sel au césium à faible fonction d'extraction. Le matériau de base du matériau de velours de carbone (25) est lié à une surface cathodique (27). La cathode froide (11) émet des électrons lorsqu'un champ électrique est appliqué, même à des températures d'exploitation inférieures à 900 DEG C.

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