Convergence correcting device capable of coma correction for use

Details Convergence correcting device capable of coma correction for use Convergence correcting device capable of coma correction for use

1986-09-25

1988-02-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313412, H01J 2970, H01J 2950

Patent

active

047257636

ABSTRACT:
A convergence correcting device for correcting mis-convergence of a cathode ray tube having in-line electron guns and, at the same time, correcting coma at the top and bottom of the screen, the device comprising pole pieces provided for the outermost electron beams for producing 4-pole magnetic fields used for convergence correction, a convergence yoke for applying the magnetic fields to the pole pieces, a convergence coil wound on the convergence yoke, a coil for producing a coma correcting magnetic field which cancels a leakage flux created between the right and left pole pieces by the vertical deflection coil, and current sources for supply currents to the coils.

REFERENCES:
patent: 3325675 (1967-06-01), Sanford
patent: 4410840 (1983-10-01), Beeteson

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