| 发明名称 |
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| 摘要 |
<p>An electron gun having a cathode of a lanthanum hexaboride single crystal is disclosed in which the axis of the cathode is set to such a crystal orientation that the electron beam has two intensive emission regions which are asymmetrical with each other in intensity. In the electron gun, even at a low heating temperature of the cathode, a single spot of an image by the electron beam of a more intensive emission region since the electron beam of a weaker intensity emission region is blocked by an aperture.</p> |
| 申请公布号 |
JPS6346942(B2) |
申请公布日期 |
1988.09.19 |
| 申请号 |
JP19790123686 |
申请日期 |
1979.09.26 |
| 申请人 |
TOSHIBA KK;TOSHIBA KIKAI KK |
发明人 |
TAKIGAWA TADAHIRO;SASAKI ISAO;TSUJI KAZUO |
| 分类号 |
H01J1/15;H01J1/16;H01J3/02;H01J37/06 |
主分类号 |
H01J1/15 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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