发明名称 |
Composite electromagnetic lens with variable focal distance |
摘要 |
The lens is formed by the association of two electromagnetic lenses sharing one and the same magnetic circuit crossed by one and the same central channel. The first lens is a shielded lens and has an annular gap at one of its ends. This annular gap cuts the central channel along a direction the plane of which is perpendicular to the optical axis. The second lens is a single-pole lens surrounding the annular gap of the first lens. It has an annular gap demarcated by two lips, the walls of which have shapes generated by revolution around the optical axis. Induction coils enable the magnetic flux of the gaps to be made to vary.
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申请公布号 |
US5038045(A) |
申请公布日期 |
1991.08.06 |
申请号 |
US19900489978 |
申请日期 |
1990.03.07 |
申请人 |
CAMECA |
发明人 |
ROUBEROL, JEAN-MICHEL;TONG, MATHIAS |
分类号 |
H01J37/141 |
主分类号 |
H01J37/141 |
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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