| 摘要 |
PURPOSE:To widely change horizontal deflection amplitude without generating the fluctuation of the output pulse voltage of a horizontal output transformer by providing an operational amplifier which compares DC voltage obtained by rectifying a pulse voltage generated on the winding of the horizontal output transformer with a reference voltage, and controlling a voltage control circuit by the output of the operational amplifier. CONSTITUTION:A coil provided with two sets of the windings like 5' is used as a horizontal amplitude adjusting coil. Then, the core 26 of magnetic material is made capable of being inserted and pulled out into/from the inside of a circular arc-shaped bobbin 25 around which the two independent windings 5a', 5b', are wound. The pulse voltage Vpa is voltage-transformed and inverted by another secondary winding 5b' wound around on and the same bobbin, and appears as the pulse voltage, -nVpa. When this is led to the primary side of a horizontal output transformer 7; a DC power supply voltage Eb' acts in a direction to encourage the change of the horizontal deflection amplitude simultaneously with the change of the value of La of the primary winding 5a'. During this, the pulse voltages Vp2, Vp3 or the DC voltages E2, E3, etc., obtained by rectifying those pulse voltages keep constant values. |
