MISS-CONVERGENCE COMPENSATION APPARATUS

摘要

a quadrupole magnetic field generator(30,60) connected to a vertical deflection input terminal and generates magnetic field at the upper coil(L1) and lower coil(L2) separately; and a vertical deflection coil(40) connected to the quadrupole magnetic field generator, deflects electron beam in the vertical direction and outputs it through a vertical deflection output port(50).