Flat thermionic cathode

Details Flat thermionic cathode Flat thermionic cathode

1976-06-08

1978-01-17

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Discharging devices with apertured electrode interposed...

Plural cathodes

313309, 313337, 313409, 313422, H01J 146, H01J 2110

Patent

active

040694364

ABSTRACT:
A flat thermionic cathode is provided with a substrate having at least one main heating element thereon to produce at least one substantially localized area of heat and a sub-heating element to substantially define a heating area, the localized area being produced within the heating area. A cathode element including electron emissive material is disposed at the localized area. While the localized area tends to produce a temperature gradient directed from the localized area toward the perimeter of the substrate so as to create thermal stress in the substrate along the perimeter thereof, the sub-heating element reduces this temperature gradient and, consequently, the thermal stress.

REFERENCES:
patent: 2883576 (1959-04-01), Harries
patent: 3066236 (1962-11-01), Sandbank
patent: 3463978 (1969-08-01), Varadi
patent: 3528156 (1970-09-01), Kling
patent: 3906276 (1975-09-01), Barraco et al.
patent: 3978364 (1976-08-01), Dimeff et al.

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