| 摘要 |
The electron gun for improving the main electrode structure includes an outer upper cap (20) forming a main electron lens, a bottom plate (23) equipped with a field controller (11) for converging a number of electron beams, and a shield cup electrode (19) combined with an outer upper cylinder (21) connected to the bottom plate. The bottom plate equips a number of passage cylinders (24) extended to the rib edge (22).
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