发明名称 |
Curvilinear variable axis lens correction with shifted dipoles |
摘要 |
An improved particle lens has an axis that is shifted to follow the central ray of the beam as it is deflected through the lens creating, in effect, a variable curvilinear optical axis for the lens and introducing aberrations depending on the object size and the distance off the lens symmetry axis. These aberrations are corrected by a set of wire pairs perpendicular to the system axis to add a gradient of the z-component of the magnetic field by which aberrations are generated of the same type but opposite direction as those inherent in the system.
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申请公布号 |
US5793048(A) |
申请公布日期 |
1998.08.11 |
申请号 |
US19960769047 |
申请日期 |
1996.12.18 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
PETRIC, PAUL F.;LANGNER, GUENTHER O. |
分类号 |
G21K1/093;G03F7/20;G21K1/08;G21K5/04;H01J37/141;H01J37/147;H01J37/153;H01J37/30;H01J37/317;H01L21/027;(IPC1-7):G21K1/08 |
主分类号 |
G21K1/093 |
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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