Directly heated cathode structure

Details Directly heated cathode structure Directly heated cathode structure

1997-04-03

1998-12-22

Patel, Ashok

Electric lamp and discharge devices

Electrode and shield structures

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

313346R, 313345, H01J 114

Patent

active

058523421

ABSTRACT:
A directly heated cathode structure includes a porous pellet impregnated with a thermionic emission material, a supporter for applying electrical power, and a filament fixed to the porous pellet, having an end, and fixed to the supporter, wherein the filament includes a connecting portion wider than the filament and fixed to the supporter at the end of the filament. The cathode structure is suitable for a color CRT such as a color television or a CRT for industrial use and having a large screen.

REFERENCES:
patent: 3983443 (1976-09-01), Schde
patent: 4587455 (1986-05-01), Falce et al.
patent: 4658181 (1987-04-01), Cooper et al.
patent: 5668434 (1997-09-01), Kim et al.

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