发明名称 |
Electron gun for a cathode-ray tube for image display having an electrode with a reduced electron beam limiting hole and a cathode with an electron emissive layer mainly made of an oxide of an alkaline metal and containing an oxide of a rare earth metal |
摘要 |
A cathode-ray tube is provided with an electron gun having a cathode and a control electrode and some other electrodes. The cathode includes an electron emissive material layer for emission of electrons through a hole in the control electrode. The hole in the control electrode has a diameter substantially in a rage of from 0.3 mm to 0.4 mm. The electron emissive material layer has a first layer made of an oxide of an alkaline earth metal formed on a support and containing no oxide of a rare earth metal, and a second layer made of an oxide of an alkaline earth metal formed on the first layer and containing an oxide of a rare earth metal substantially in an amount of from 0.8 wt % to 5.0 wt %.
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申请公布号 |
US6124667(A) |
申请公布日期 |
2000.09.26 |
申请号 |
US19980021995 |
申请日期 |
1998.02.11 |
申请人 |
HITACHI, LTD. |
发明人 |
KOMIYA, TOSHIFUMI;KOIZUMI, SACHIO |
分类号 |
H01J1/14;H01J29/48;(IPC1-7):H01J1/14 |
主分类号 |
H01J1/14 |
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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