Dispenser cathode for a grid-controlled electron tube and method

Details Dispenser cathode for a grid-controlled electron tube and method Dispenser cathode for a grid-controlled electron tube and method

1975-10-02

1977-06-21

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

313304, 313338, 313346DC, H01J 114, H01J 1906, H01K 104

Patent

active

040314251

ABSTRACT:
A dispenser cathode for a grid-controlled electron tube in which the emission of surface regions immediately opposite the control grid is reduced by providing projections above the emissive surface of fused, pore-closing portons which have a focussing effect. These projections may be formed by electron beam or laser beam welding.

REFERENCES:
patent: 2782334 (1957-02-01), Gardner
patent: 3119041 (1964-01-01), Harris
patent: 3377492 (1968-04-01), Oess
patent: 3402314 (1968-09-01), Vlaardingerbroek et al.
patent: 3500110 (1970-03-01), Winsor
patent: 3558967 (1971-01-01), Miriam
patent: 3648096 (1972-03-01), Beggs
patent: 3818260 (1974-06-01), Elfe, Jr. et al.
patent: 3843902 (1974-10-01), Miriam et al.

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