Heater for indirectly-heated cathode

Details Heater for indirectly-heated cathode Heater for indirectly-heated cathode

1989-03-01

1991-08-06

DeMeo, Palmer C.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313270, H01J 122

Patent

active

050380710

ABSTRACT:
In a heater for an indirectly-heated cathode having a double helical structure, a film which can be removed by heating at the temperature of 250.degree. to 350.degree. C. is disposed between adjacent portions in a vertical direction, of a helical core wire coated with an insulating layer. Since this film is disposed, the occurrence of cracks in the insulating layer can be prevented so that the insulating property between the heater and a cathode sleeve do not gel deteriorated and clogging of an electron beam aperture of a shadow mask can be prevented, too.

REFERENCES:
patent: 792001 (1905-06-01), Callan
patent: 3119897 (1964-01-01), Coper
patent: 3691421 (1972-09-01), Decker et al.

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