Method of manufacturing a color display tube and color display t

Details Method of manufacturing a color display tube and color display t Method of manufacturing a color display tube and color display t

1978-05-19

1980-09-02

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

042208971

ABSTRACT:
A ring is provided to correct the convergence, color purity and frame errors of a color display tube which ring is magnetized as a multipole and which is secured in or around the tube neck and around the paths of the electron beams.
The magnetization of such a ring can best be carried out by energizing a magnetization unit with a combination of direct currents thereby generating a multipole magnetic field and then effecting the magnetization by generating a decaying alternating magnetic field which preferably varies its direction continuously.

REFERENCES:
patent: 4125795 (1978-11-01), Ikebata et al.

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