| 摘要 |
A color TV picture tube with in-line electron guns is scanned by horizontal and vertical deflection coils on its neck. The coils generate magnetic fields within the tube with negative astigmatism in the horizontal direction and positive astigmatism in the vertical. This produces convergence of the beams over the whole screen. The distribution of the windings is designed to introduce zones of inhomogeneity along the axis, which makes the convergence insensitive to alignment of the coils w.r.t the axis of the tube.
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