| 摘要 |
In a color display tube of the so-called "in-line" type, the magnetic field which extends substantially parallel to the plane through the beam axes is distorted so as to be locally pincushion-shaped by means of field shapers at the end of the electron gun system. This effects coma correction for the rasters produced by the three electron beams at the display screen, without causing substantial deflection defocusing of the side beams.
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