Process and apparatus for magnetizing a magnetic ring for static

Details Process and apparatus for magnetizing a magnetic ring for static Process and apparatus for magnetizing a magnetic ring for static

1996-12-04

1998-10-27

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

31536825, 31536827, G09G 128, H01J 2951

Patent

active

058281894

ABSTRACT:
A process and apparatus are described for custom magnetizing a magnetic ferrite ring on the outside of the neck of a color cathode ray tube (CRT), in order to provide correction of convergence, color purity and frame errors in the CRT. The two step process provides for a first coarse correction step and a second fine correction step, each step involving bringing the ring to an initial state of magnetic saturation, and then custom magnetizing the ring using a series of high power AC pulses and low power DC offsetting fields, via cylindrical coils positioned around the periphery and in close proximity to the ring.

REFERENCES:
patent: 4636694 (1987-01-01), De Paolis et al.

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