| 摘要 |
PURPOSE:To attain the correction of dynamic focus over the entire fluorescent screen with a simple circuit constitution by constituting a dynamic focus correction circuit of a flat picture tube by a signal inverting amplifier circuit. CONSTITUTION:The level of an intermediate voltage of a horizontal deflection coil 1 and a DC blocking capacitor 2 is set by a variable resistor 3 and the result is fed to a signal inverting amplifier circuit 4. The output of the signal inverting amplifier circuit 4 is superimposed on a focus power supply 7 and the result is fed to a focus electrode G3.
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