| 摘要 |
PURPOSE:To eliminate any difference between deflection sensitivity to both side beams and the same to the central beam, with regard to the combination of a color picture tube and deflection yoke, wherein the deflection sensitivity to both side beams is different from the deflection sensitivity to the central beam. CONSTITUTION:12 and 14 denote both side beam emission holes of an electron gun while 13 denotes a central beam emission hole. Also 23 and 24 are deflection magnetic field control elements while 25-30 denote each part of the magnetic field control elements. In said constitution arrangement, the horizontal deflection magnetic field near the central beam emission hole 13 becomes fairly scarcse because much of the magnetic flux is converged by the parts 25 and 26 of the magnetic control elements 23 and 24. Accordingly, the magnetic field control elements 23 and 24 act to weaken the horizontal deflection sensitivity to the central beam 4 thus to enable even coma aberration to be easily corrected. |
