Methods of manufacturing a color display tube having a magnetic

Details Methods of manufacturing a color display tube having a magnetic Methods of manufacturing a color display tube having a magnetic

1981-04-02

1984-01-31

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

335284, 313403, H01J 2907, H01J 900

Patent

active

044287364

ABSTRACT:
In a first method, a meander-shaped coil (20,21) is provided on each side of the mask (7) having apertures (9). The coil (21) is oriented perpendicularly relative to the coil (21). If a current flows through the coils (20,21) in the correct direction, a magnetic quadrupole is formed along circumference of each aperture (9). In a second method, a holder (30,31) with permanent magnetic strips (32) is provided on each side of the mask (7). The strips (32) in the one holder (30) are oriented perpendicularly relative to the strips in the other holder (31) A coil 40 is provided around the holders 30 and 31 with which a decaying magnetic alternating field is generated which initially drives the material of the mask (7) on both sides of the hysteresis curve into saturation. After the decay of said alternating field, a magnetic quadrupole is present along the circumference of each aperture (9).

REFERENCES:
patent: 2442808 (1948-06-01), Granberry
patent: 4135111 (1979-01-01), Verweel
patent: 4339688 (1982-07-01), Verweel

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