| 摘要 |
PURPOSE:To compensate a change in the deflection due to a voltage drop of a high voltage generating source by applying amplitude modulation to a voltage signal fed to a deflection electrode with an electron beam quantity radiating to a screen. CONSTITUTION:Transistors(TRs) 12, 13 are components of a differential amplifier and a current output of a deflection input signal 41 outputted to a collector of a TR11 is amplitude-modulated by a video signal 40 and outputted as a current to a collector of the TR13. The current output is converted into a voltage by a resistor R17 and outputted as deflection output signals 42, 43 with a different polarity at the output terminal by an inverse amplification TR14 and current amplification TRs 15, 16 respectively. That is, when the mean brightness of the screen is increased, the potential of the screen plate is lowered and the deflection is increased, but when the level of the video signal 40 is increased, the level of the deflection output signals 42, 43 is both decreased. Thus, the increase in the deflection is cancelled and the deflection is kept constant as a whole. |
