Electron gun having an arc-inhibiting electrode

Details Electron gun having an arc-inhibiting electrode Electron gun having an arc-inhibiting electrode

1976-11-29

1978-06-13

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

H01J 2946

Patent

active

040951383

ABSTRACT:
Arc-inhibiting means for a television picture tube having an electron gun with a main focus lens section of the extended field type. The lens establishes an extended, axially continuously active focusing field which is substantially shielded from external field disturbances. There exist widely disparate potentials with a potential difference in the range of tens of kilovolts across the gap between a grid means of an electron source means and an initial end electrode of the main focus lens. The potential difference is sufficient to introduce a tendency toward destructive arcing between the grid means and the initial end electrode. The electron gun according to the invention is characterized by having at least one arc-inhibiting electrode disposed between the grid means and the initial end electrode, and having a potential thereon that is intermediate to the disparate potentials to provide an arc-inhibiting voltage gradient between the grid means and the initial end electrode.

REFERENCES:
patent: RE25127 (1962-02-01), Szegho
patent: 3015752 (1962-01-01), Schrecongost
patent: 3049641 (1962-08-01), Gleichauf
patent: 3895253 (1975-07-01), Schwartz et al.

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