| 摘要 |
PURPOSE:To effectively compensate right and left pincushion distortions and obtain distortion-less raster by setting the arranging direction of electron guns set in in-line arrangement in the deflector of color picture tube, as the reference line and by respectively arranging two kinds of field adjusting apparatuses with different pole-to-pole distances on the screen side at both sides of such reference line the deflector as attachments to said deflector. CONSTITUTION:The field adjusting apparatuses consisting of two kinds of magnets 2a and 2b different in their pole-to-pole distances are respectively provided on the same side as the horizontal deflection coils 3 arranged at the upper and lower sides of the reference line H-H of the deflector 1, namely at the upper and lower screen of the reference line. The magnet 2b having the pole-to-pole distance shorter than that of the magnet 2a has a shorter effective length. Therefore, it works in such a manner as pulling the area near the vertical axis of raster to the upper and lower sides and mainly executes the upper and lower pincushion type compensation. Therefore, the raster having compensated distortion as indicated in the figure can be obtained by two kinds of field adjusting apparatuses having different pole-to-pole distances. |
