Deflection yoke apparatus with means for reducing unwanted radiation

摘要

A deflection yoke apparatus comprises pairs of horizontal and vertical deflection coils. A coil separator is located between both coils. A deflection core forms a magnetic path for a magnetic flux generated from both deflection coils. An auxiliary coil is arranged at least a one position in a vertical deflection direction outside the deflection core. A horizontal deflection current is supplied to this auxiliary coil. A magnetic field, generated from the auxiliary coil, reduces an intensity of externally leaking magnetic field which radiates outside the deflection core when a horizontal deflection current is supplied to the horizontal deflection coils.