Cathode ray tube cathode with cap and sleeve structure

Details Cathode ray tube cathode with cap and sleeve structure Cathode ray tube cathode with cap and sleeve structure

1984-09-25

1986-09-09

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313337, 445 50, H01J 2904, H01J 904

Patent

active

046111450

ABSTRACT:
An indirectly heated cathode structure for use in cathode ray tubes containing a hollow sleeve of cylindrical shape wherein one edge portion of the sleeve is folded outwardly and backwardly around and against the sleeve. A cap having a circular surface surrounded by a circular sidewall is disposed over the folded edge portion of the sleeve. The sidewall contains an annularly shaped ledge extending around an interior surface portion thereof upon which an end of the folded edge portion of the sleeve rests so as to increase the resistance of the cap to push-off forces applied thereto when the sleeve is restrained. A method for forming the foregoing structure is also disclosed.

REFERENCES:
patent: 2263660 (1941-11-01), Vasselli
patent: 3549929 (1970-12-01), Pappadis
patent: 4184100 (1980-01-01), Takanashi et al.
patent: 4297612 (1981-10-01), Anezaki et al.
patent: 4478590 (1984-10-01), Rychlewski

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