Flat thermionic cathode with plural heating elements

Details Flat thermionic cathode with plural heating elements Flat thermionic cathode with plural heating elements

H - Electricity

01

J

313/183, 313/187

H01J 1/20 (2006.01) H01J 29/04 (2006.01) H01J 29/48 (2006.01)

Patent

CA 1072169

SO814 FLAT THERMIONIC CATHODE ABSTRACT OF THE DISCLOSURE 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. -i-

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