Cathode-ray tube and cathode unit for such a cathode-ray tube

Details Cathode-ray tube and cathode unit for such a cathode-ray tube Cathode-ray tube and cathode unit for such a cathode-ray tube

1982-10-18

1985-05-07

Demeo, Palmer

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313270, 313337, H01J 2948, H01J 1948

Patent

active

045160511

ABSTRACT:
A cathode filament formed from a thin metal wire wound into a helical spiral is welded at its two ends to connection braces by means of a high energy beam such as a laser beam. By increasing the pitch of at least one of the turns near each of the two ends, welding is confined to a predefined number of turns and uniformly welded cathodes are obtained having filament resistances which differ by less than 1%.

REFERENCES:
patent: 3354340 (1967-11-01), Almer et al.
patent: 4403169 (1983-09-01), Blanken

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