Image-geometry corrector for a cathode-ray tube

Magnetic geometry-correction device for a cathode-ray tube comprising:

• a first set of four coils placed in series one with the other, coiled on a magnetic core, the said coils being traversed by at least a portion of the horizontal deflection current supplying the horizontal deflection coils of a deflector equipping the said tube,
• magnetic means intended to apply to the core a magnetic field oriented in one direction for one of the pairs of coils and in the opposite direction for the second pair,
• wherein the magnetic device furthermore comprises:
• a second set of two coils in series one with the other and arranged around the magnetic core so as to contain the magnetic fluxes created by the first set of coils, the two coils being traversed by at least part of the vertical deflection current supplying the vertical deflection coils of the deflector equipping the said tube and placed so as to create, in the magnetic core, magnetic fluxes oriented in one direction in one of the pairs of coils of the first set and in the opposite direction in the second pair of the first set.