Oxide-coated cathode for CRT and manufacturing method thereof

Details Oxide-coated cathode for CRT and manufacturing method thereof Oxide-coated cathode for CRT and manufacturing method thereof

1991-08-19

1992-06-09

Yusko, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

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

313270, 313355, 445 50, 445 51, 427 77, 427 78, H01J 1906, H01J 904

Patent

active

051210274

ABSTRACT:
This invention relates to an oxide-coated cathode for CRT and a manufacturing method thereof, where Scandium (Sc) or Scandium Oxide (Sc.sub.2 O.sub.3) is vaporized and ionized into a gas state under the oxygen existing environment, and is accelerated onto the surface of a base of Ni containing small amounts of a reducing element such as Mg or Si to form an implantation layer in a certain depth within the base, thereby enhancing the electron emissive characteristics and lengthening the longevity of the cathode.

REFERENCES:
patent: 4797593 (1989-01-01), Saito et al.
patent: 4864187 (1989-09-01), Sano et al.
patent: 5041757 (1991-08-01), Longo et al.

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