Cathode for cathode ray tube of directly heating type and proces

Details Cathode for cathode ray tube of directly heating type and proces Cathode for cathode ray tube of directly heating type and proces

1977-07-06

1978-12-12

Smith, Alfred E.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313311, H01J 1906, H01J 904

Patent

active

041298012

ABSTRACT:
The present cathode for cathode ray tube of directly heating type is characterized by comprising a cathode substrate body having two leg pieces extended in the same direction and a flat part connected to one end of each leg piece, prepared by shaping a flat metal plate of nickel- or cobalt-based alloy, a bonding layer having an uneven surface prepared by diffusion bonding by heating a powder layer comprising powders of alloy or mixture of nickel and cobalt formed on the flat part, to which a thermionic emission layer is to be bonded, and the thermionic emission layer, and has a very small deformation when used and a longer life.
A cathode with much less deformation and much longer life can be obtained by using a cathode substrate body prepared from a flat metal plate provided with a thinner metal layer of at least one of nickel and cobalt on its surface than the flat metal plate by diffusion bonding.
A cathode with much less deformation after the service for a long period and much longer life is obtained by using a cathode substrate body prepared from a flat metal plate provided with a metal layer of at least one of nickel and cobalt having a smaller thickness on its surface than that of the flat metal plate by diffusion bonding, and then applying a plastic working to the flat metal plate to a desired thickness.

REFERENCES:
patent: 3257703 (1966-06-01), Coad et al.
patent: 3374385 (1968-03-01), Lattimer
patent: 3694688 (1972-09-01), Kuiper et al.

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