| 摘要 |
PURPOSE:To constitute a correcting circuit of a small signal circuit by superposing a voltage required for vertical pincushion distortion correction on the AC feedback line of a vertical deflecting circuit. CONSTITUTION:A vertical drive circuit 2 converts the output from a vertical oscillating circuit 1 to a saw tooth wave and drives a vertical output circuit 3 by this saw tooth wave, and the series circuit of a vertical deflecting coil 4 and a resistance 5 is connected to the output side of the vertical output circuit 3. An AC feedback circuit 7 feeds back the saw tooth wave voltage generated in the resistance 5 to the vertical drive circuit 2, and the output of a multiplier 8 which multiplies the saw tooth wave voltage generated in the resistance 5 and the horizontal parabolic voltage given from a terminal 9 is given to an AC feedback line 10 through an adder 11, and the vertical pincushion distortion correcting voltage is superposed on the vertical saw tooth wave voltage and is impressed to the vertical drive circuit 2. Thus, the correcting circuit consists of the small signal circuit. |
