| 摘要 |
The electron gun for reducing the halo phenomenon caused by the focus length difference of the electron beam includes first uni-potential type focus lenses (14-16), second uni-potential type focus lenses (17,18), and a bi-potential type focus lens (19). The constant voltage (VS) is applied to the electrodes (15,17) and the focus voltage (VF) being higher than the constant voltage is applied to the electrodes (16,18). The dynamic voltage (VD) synchronized to the deflection signal and being higher than the focus voltage is applied to the electrodes (14,19).
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