| 摘要 |
An in-line electron gun for a color cathode ray tube is provided, which improves the assembly characteristics and compensates for aberration such as astigmatism, thereby substantially improving the focusing characteristics over the whole phosphor screen. In the in-line electron gun, a main lens is formed between a focusing electrode (6) and an accelerating electrode (7); and electric field correction plates (9) and (10) are disposed in each of the focusing electrode (6) and an accelerating electrode (7) in the vertical direction to electron beam passing axes, and have three electron beam passing apertures aligned in line, respectively, the three apertures comprising at least one central electron beam passing aperture of a key-hole shape which is symmetrical with respect to a vertical line to a central electron beam passing axis and two side electron beam passing apertures, each of which is defined by a plurality of circular arcs having different radii of curvature and connected to each other circular arc asymmetrically with respect to a vertical line to each side electron beam passing axis.
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