| 摘要 |
PROBLEM TO BE SOLVED: To prevent a significant deterioration of resolution at left and right ends of the screen due to large difference in magnetic field intensity of self- convergence which each electron beam of R, G, B receives in passing deflection magnetic field in the case of color cathode-ray tube for a flat screen image display of high resolution and wide angle deflection. SOLUTION: With the electron gun 10 for an inline color cathode-ray tube consisting of at least a focusing electrode 14 of electron beams 17R, 17G, 17B and a lens group with a final acceleration electrode, a main lens 16 in the final step of the lens group is composed of the focus electrode 14 and the final acceleration electrode 15 and a diamond-shaped astigmatism compensating electrode 18 is provided extending toward a main shaft of the electron gun 10 at top and bottom parts of passage holes of R, B electron beams 17R, 17B of the final acceleration electrode 15.
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