HORIZONTAL DEFLECTION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To optimize the linearity in all amplitude areas by rectifying a converted voltage from a horizontal deflection current so as to detect a horizontal amplitude thereby controlling a linearity correction amount accordingly. SOLUTION: An output waveform of a horizontal deflection current - voltage conversion circuit 4 is rectified into a DC by a rectifier circuit 5 and used to change an amplitude of a parabolic waveform outputted from a parabolic wave generating circuit 6. As a result, optimum linearity is applied to a deflection current waveform. A phase control circuit 7 controls a phase of a pulse outputted from a horizontal deflection circuit 3 to compensate a phase deviation of a linearity correction circuit 8 and the horizontal deflection circuit 3. The horizontal amplitude is detected and the optimum linearity correction amount and phase of the correction parabolic wave are controlled accordingly to realize the optimum linearity even when the horizontal deflection amplitude is changed.