Method of manufacturing a color display tube and device for carr

Electric lamp or space discharge component or device manufacturi – Process – With testing or adjusting

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315368, 445 63, H01J 9236

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active

046628533

ABSTRACT:
A method of and a device for use in manufacturing a color display tube in which magnetic poles are provided in or around the neck (4) of the tube envelope (1) and around the paths of the electron beams (18, 19, 20) extending substantially parallel to the axis (8) of the tube, said magnetic poles generating a permanent multipole magnetic field for the correction of the convergence, color purity and frame defects of the color display tube. The magnetic poles are formed by magnetization of a configuration of a magnetizable material (15) which is provided around the paths of the electron beams (18, 19, 20), said configuration being magnetized by energizing a multipole coil unit (21-28) by means of a combination of currents (Ia-Ih) which generate a static multipole magnetic field and the magnetization is produced by means of a decaying alternating magnetic field which initially drives the magnetizable material on both sides of the hysteresis curve into saturation. If the magnetization takes place within one frame period and the decaying alternating magnetic field has a frequency between 400 Hz and 4000 Hz, in which the decrease of the amplitude of the alternating magnetic field is less than 10% per half a cycle, an inexpensive and rapid method of magnetization is achieved in which it is not necessary to switch off the voltages at the gun electrodes (5, 6, 7) and the currents through the deflection coils (13) during magnetization.

REFERENCES:
patent: 4189659 (1980-02-01), Andre et al.
patent: 4211960 (1980-07-01), Barten et al.
patent: 4220897 (1980-09-01), Barten et al.
patent: 4578661 (1986-03-01), van Rijsewijk

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