| 摘要 |
PURPOSE:To execute right and left pincushion distortion correction and to decrease raster distortion, inverse trapezoid distortion by varying a discharge current of a capacitor in a parallel circuit into parabola shape in the vertical period by means of a modulation source. CONSTITUTION:When the voltage VC 11 across the capacitor C 11 is discharged through the modulation source A, the discharge current iD makes a voltage -VC 11 come lower, accordingly, the voltage VCs across an sigmoidal correction capacitor Cs lowers and a horizontal deflection current iy also decreases. When a current iD is made less, the -VC 11 and the VCs rise and the deflection current iy increases also. Through the above processes, a discharge current iD from the capacitor C 11 is changed into a parabola shape in the vertical period, and the deflection current iy is also changed into a parabola shape in the vertical period in order to correct both right and left bobbin distortion. Furthermore, since no correction transformer is used, raster distortion does not occur and nor inverse trapezoid distortion occurs. And, since no correction transformer is used, neither raster distortion nor inverse trapezoid distortion will occur. |
