| 申请日期 | 2025-06-27 | 申请号 | US09985737 |
| 公开（公告）号 | US6903499B2 | 公开（公告）日 | 2005-06-07 |
| 公开国别 | US | 申请人省市代码 | 全国 |
| 申请人 | Yoshinori Terui; Shinpei Hirokawa; Katsuyoshi Tsunoda | ||
| 简介 | An electron gun includes an electron emission cathode, a control electrode, and an extractor and the electron emission cathode is made of rare earth hexaboride. A tip of the electron emission cathode is located between the control electrode and the extractor, and the electron emission surface of the electron emission cathode is spherical or flat. | ||
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