| 摘要 |
An electron gun for a cathode ray tube includes an accelerating electrode to be supplied with a maximum voltage, a focus electrode disposed adjacent to but spaced from the accelerating electrode, and a focus-corrective electrode adjacent to but spaced from the focus electrode. The accelerating electrode and the focus electrode form a first electron lens for focusing the electron beams stronger in a horizontal direction than in a vertical direction, and the focus-corrective electrode is configured so as to form a second electron lens by application thereto of a voltage lower than a voltage applied to the focus electrode in cooperation with the focus electrode for focusing the electron beams stronger in the vertical direction than in the horizontal direction, and is adapted to be supplied with a voltage increasing with increasing deflection of the electron beams but lower than the voltage applied to the focus electrode.
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