| 摘要 |
PROBLEM TO BE SOLVED: To provide an in-line type color picture tube reducing green droop without increasing the pincushion distortion of the upper and lower rasters and excellent in convergence performance by devising the winding distribution. SOLUTION: A coil inner curved surface 1 draws a circular arc with the radius R1 centering on the origin, and a coil outer curved surface draws a circular arc 2 with the radius R2 centering on the point (x1, y1) of the third quadrant in the region of the winding angle or below. The thickness of the coil cross section becomes smaller as the winding angle is increased up to the vicinity of 45 deg. according to this circular arc shape, and the occurrence of the quartic distortion component of the horizontal magnetic field can be suppressed. The coil outer curve surface corresponds to the tangential line 3 of the circular arc with the radius R2 at the point P of the winding angleαin the region of the winding angleα(angle of 45 deg. or above).
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