| 摘要 |
PROBLEM TO BE SOLVED: To acquire excellent resolution by reducing the brightness of halo while suppressing the generation of halo. SOLUTION: An electron beam passage hole of a first electrode 2 is formed in oblong shape, and the opposed face of a second electrode 3 to the first electrode 2 is provided with an electron beam passage hole 3a provided with oblong recessed slits 3a-2 on both sides of a through-hole 3a-1.
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