Cathode structure comprising a heating element

Details Cathode structure comprising a heating element Cathode structure comprising a heating element

1996-07-09

1998-03-17

Patel, Nimeshkumar

Electric lamp and discharge devices

Electrode and shield structures

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

313346DC, 313337, 313341, 313344, 313270, 313271, H01J 122

Patent

active

057290822

ABSTRACT:
A cathode structure comprises at an end portion (1) an electron-emitting material (4) and a heating element (5) of wire (7), said cathode structure having a plurality of primary helical turns (8). These primary turns are used to form a first series of secondary turns (9) which are wound in a first direction with a pitch and which extend towards the end portion (1), and to form a second series of secondary turns (10) which extend from the end portion (1) and which have the opposite direction of winding yet the same pitch. Near the end portion (1), the first and second series of turns (9, 10) are interconnected by an arc-shaped connecting portion (12) having primary turns (8). This arc-shaped connecting portion (12) has a span S.sub.a and a rise r.sub.a, the ratio r.sub.a /S.sub.a preferably ranging from 0.3 to 0.5.

REFERENCES:
patent: 4745325 (1988-05-01), Koizumi
patent: 5426351 (1995-06-01), Imura
Beriere et al., "Quick-vision CTV Picture Tube A66-410X", Philips Product Note, 1973, pp. 1-4.

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