Quick-heating cathode structure

Details Quick-heating cathode structure Quick-heating cathode structure

1980-11-24

1983-06-14

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

313270, 313337, 313341, H01J 114, H01J 1906, H01K 104

Patent

active

043885519

ABSTRACT:
A one-piece, directly heated cathode is disclosed for use in a cathode ray tube electron gun. The cathode according to the invention has the configuration of a hollow cylinder with one closed end for receiving a thermionic electron-emissive coating. A pair of body portions extending axially in the same direction from diametrically opposed sides of the closed end define two legs which act as serial electrical conductors having inherent resistance for use in resistively heating the electron-emissive coating. The legs have an arcuate cross-section effective to structurally stabilize the cathode and suppress temperature-induced lateral displacement of the cathode which would otherwise degrade the performance of the electron gun.

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patent: 3450927 (1969-06-01), Schmidt et al.
patent: 3465195 (1969-09-01), Fuchs
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patent: 3947715 (1976-03-01), Puhak
patent: 3983443 (1976-09-01), Schade
patent: 4129801 (1978-12-01), Soeno et al.
patent: 4215180 (1979-01-01), Misumi et al.

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