System for converging a plurality of electron beams in cathode r

Details System for converging a plurality of electron beams in cathode r System for converging a plurality of electron beams in cathode r

1990-03-14

1992-02-04

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

335213, 31536828, G09G 104, H01J 2970, H01H 100

Patent

active

050862596

ABSTRACT:
A convergence system for a cathode-ray tube having three detection magnetic pole pieces are disposed opposing to each other on both sides of a center beam for forming magnetic paths inside the neck part of a cathode-ray tube. A first convergence yoke is disposed outside the neck part of the cathode-ray tube for forming magnetic paths together with the magnetic pole pieces. A first coil is wound on a first convergence yoke to generate a magnetic field for correcting horizontal misconvergence between the center beam and a side beam on a side of the center beam. A second coil is wound on the first convergence yoke to generate a magnetic field for correcting horizontal misconvergence between the center beam and a side beam on the other side of the center beam. A third coil is wound on the first convergence yoke to generate a magnetic field for correcting vertical misconvergence between the center beam and both side beams. Furthermore, a second convergence yoke is disposed on the neck part of the cathode-ray tube at a different position from the first convergence yoke. A fourth coil is wound on the second convergence yoke to generate a magnetic field for correcting vertical misconvergence between both side beams.

REFERENCES:
patent: 3430099 (1969-02-01), Ashley
patent: 4642527 (1987-02-01), Takahashi et al.
patent: 4725763 (1988-02-01), Okuyama et al.
Baumgartner, "Simple Convergence in the New 22-Inch Colour Television Receivers", Grundig Tech Info. (German) No. 5, (1974) pp. 409-412.

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