Electron gun for cathode-ray tube

Details Electron gun for cathode-ray tube Electron gun for cathode-ray tube

1978-06-02

1981-06-30

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

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

H01J 2946, H01J 2956

Patent

active

042764955

ABSTRACT:
In an electron gun for cathode-ray tube comprising a lens system constructed by four cylindrical electrodes concentrically arranged apart from each other for focusing electron beams emitted from a cathode, these electrodes are applied with proper voltages so as to form a bipotential type focusing lens and a unipotential type focusing lens. Preferably, the length of the electrode in the unipotential type focusing lens lying at the cathode side is selected to be larger than a half of the inner diameter of the electrode.

REFERENCES:
patent: Re25127 (1962-02-01), Szegho
patent: 3049641 (1962-08-01), Gleichauf
patent: 3852637 (1974-12-01), Yamazaki et al.
patent: 3863091 (1975-01-01), Hurukawa et al.
patent: 3895253 (1975-07-01), Schwartz et al.
patent: 3987329 (1976-10-01), Yamazaki et al.

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