发明名称 |
SCANNING ELECTRON BEAM APPARATUS FOR VIEWING POTENTIAL DISTRIBUTION ON SPECIMEN SURFACES |
摘要 |
In electron beam apparatus, in which a finely focused probe is caused to impinge on the surface of a specimen and the resulting secondary electrons are collected and used to show potential distribution on the specimen surface the detector includes, between the collector and the specimen, a positive grid and a further grid, this further grid being of variable low or negative potential to form effectively a potential barrier of adjustable height to discriminate between electrons coming from regions of different potential.
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申请公布号 |
US3646344(A) |
申请公布日期 |
1972.02.29 |
申请号 |
USD3646344 |
申请日期 |
1969.12.31 |
申请人 |
GRAHAM PLOWS;WILLIAM CHARLES NIXON |
发明人 |
GRAHAM PLOWS;WILLIAM CHARLES NIXON |
分类号 |
H01J37/244;H01J37/26;(IPC1-7):H01J37/28 |
主分类号 |
H01J37/244 |
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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