| 摘要 |
PURPOSE: To prevent a deflecting current from phase modulation by generating an S-shape corrected deflecting current in a deflecting winding in response to a saw tooth signal obtained by reducing the change rate of the saw tooth signal by 2nd impedance bypassing a part of a current in 1st impedance. CONSTITUTION: A vertical oscillation circuit 501 is connected to a synchronizing pulse 2V' and a ramp generator 500 includes a charging current generating resistor R2 connected to a terminal 500a of capacitors C1 , C2 , connected in series. The generator 500 includes also S-shape correction constitution 700 and a capacitor C3 is connected between the emitter electrode of an emitter-follower transistor(TR) Q2 and a terminal 701. Consequently the ramp generator 500 and the vertical oscillation circuit 501 can reduce or prevent phase variation in the trace part of a deflecting current for a vertical synchronizing pulse 2V' having twice field frequency in which the interval of a 4-field sequence is irregular. |
