Cathode for an electric discharge tube

Details Cathode for an electric discharge tube Cathode for an electric discharge tube

1992-07-02

1994-01-11

Seidel, Richard K.

Electric lamp or space discharge component or device manufacturi

Process

Combined, e.g., with shaping of lamp or device envelope

445 51, 427318, B05D 302, B05D 512

Patent

active

052776379

ABSTRACT:
A cathode having a short heating time and a long lifetime for an electric discharge tube is provided. The cathode comprises a metal (particularly nickel) support base coated with a layer of potentially electron-emissive material, which support base has a thickness ranging between 20 and 150 .mu.m, while the metal crystallites have a size which does not permit of any further crystallite growth or recrystallization. Particularly, the crystallites of the support base have a size which corresponds to the thickness of the support base. The cathode is obtained by a method in which the recrystallization thermal treatment is effective to prevent additions in the metal of the support base from forming oxides to a depth which is further than 1 micrometer from the surface.

REFERENCES:
patent: 2631945 (1953-03-01), Morrison
patent: 3535757 (1970-10-01), Nestleroth et al.
patent: 3536526 (1970-10-01), Month
patent: 3958146 (1976-05-01), Beuscher

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