| 摘要 |
PURPOSE:To reproduce a projected picture having always correct color by flowing a current in response to the change in a high voltage current of a cathode ray tube to convergence coil to prevent the shift of static convergence due to the change in the brightness of the screen. CONSTITUTION:A resistor 17 for detecting high voltage current is connected to a cold end of a high voltage winding 14 of a high voltage generating transformer 11 and the voltage across the resistor is smoothed by a capacitor 18 and fed to a convergence amplifier 21 via resistors 19, 20. Then a current in response to the high voltage current flows to the convergence coil 22. On the other hand, a normal convergence correcting signal is applied from a terminal 27 through resistors 25, 26, the said signal current and the current in response to the said high voltage current are superimposed and flow to the convergence coil 22. Thus, the shift of the static convergence due to the fluctuation of the high voltage current is corrected by adjusting the resistor 20. |
