| 摘要 |
The display surface of a square flat display tube is relatively flat with a curvature along the main axis and the lines parallel with this which in general are larger near the left and right edges than in the middle. A tuned LC circuit 60, which is connected to the deflection winding LH, has a resonance oscillation period of almost half the line trace interval. The tuned circuit 60 introduces an oscillating correction component into the trace flow, which brings about further S-shaping of that part of the line scanning which is situated between the middle and the left and right edges. <IMAGE>
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