| 摘要 |
In an electron gun including a cathode, a control electrode, an acceleration electrode G 2, a focusing electrode G 3 and an anode, longitudinally elongated concave SL-V which surround an electron beam aperture G 2 -H and have a long axis in the vertical direction is formed at a focusing electrode G 3 side of the acceleration electrode G 2, and an electron beam aperture G 3 -BH formed at the acceleration electrode G 2 side of the focusing electrode G 3 is formed in a longitudinally elongated shape having a long axis in the vertical direction. Due to such a constitution of the present invention, non-uniformity of the beam spot shape attributed to a deflection quantity can be reduced whereby the optimum focusing can be realized over the whole area of a screen.
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