| 摘要 |
PROBLEM TO BE SOLVED: To minimize the horizontal diameter of a peripheral spot and to improve the resolution of the peripheral part of a phosphor screen by setting the horizontal focusing force by the effect of a low-voltage side lens weaker than the vertical focusing force thereby, and setting the horizontal dispersing force by the effect of a high-voltage side lens weaker than the vertical dispersing force thereby. SOLUTION: In an in-line color picture tube having a plurality of focusing electrodes having elliptic apertures having a horizontal long axis, a low voltage side focusing electrode 1 has a field correcting electrode 3 having three holes 4, 5, 6 for passing electron beams on the inside of an opening 1a (elliptic form having a horizontal diameter LS and a vertical diameterΔV). A high-voltage side focusing final accelerating electrode 2 has a field correcting electrode 7 having three holes 8, 9, 10 for passing electron beams on the inside of an opening 2a (2a=1a). The ratioΦV/LS is set to be 0.48 or less and the ratios L3/LS, L4/LS of the distances L3, L4 from the respective opening ends of each field correcting electrode to LS are set to be 0.15 or more.
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