Dispenser cathode and method of manufacturing the cathode

Details Dispenser cathode and method of manufacturing the cathode Dispenser cathode and method of manufacturing the cathode

H - Electricity

01

J

316/17, 313/35.2

H01J 29/48 (2006.01) H01J 1/28 (2006.01) H01J 9/04 (2006.01) H01J 29/04 (2006.01)

Patent

CA 1204810

ABSTRACT Method of manufacturing a dispenser cathode having an emissive surface (51) extending substantially perpendicularly to an axis (52), which emissive surface (51) of the cathode is surrounded by a conductive collar (68) which extends from the edge of the emissive surface substantially parallel to the axis (52). By making the part of the emissive surface (51) which adjoins the collar (68) to be less porous than the remainder of the emissive surface by sealing the pores with a high energy beam or by locally squeezing the pores during a drawing process of a holder around the emissive body (60), the anode cur- rent, especially in a diode gun, can be further reduced.

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