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    • 5. 发明公开
    • CHARGED PARTICLE BEAM DEVICE AND SCANNING ELECTRON MICROSCOPE
    • 带电粒子束装置和扫描电子显微镜
    • EP3252797A1
    • 2017-12-06
    • EP15880117.5
    • 2015-12-03
    • Matsusada Precision, Inc.
    • KUMAMOTO, KazuyaMATSUDA, Sadayoshi
    • H01J37/141H01J37/20H01J37/28
    • H01J37/21H01J37/141H01J37/20H01J37/244H01J37/28
    • [Object] To allow a charged particle beam device to have a higher performance
      [Means to Attain Object] A charged particle beam device includes: a charged particle source 11; an acceleration electric power source 14 connected to the charged particle source 11 and configured to accelerate a charged particle beam 12 emitted by the acceleration electric power source 11; and an objective lens 26 configured to focus the charged particle beam 12 onto a sample 23, the objective lens 26 being positioned on a first side of the sample 23 which first side is opposite to a second side of the sample 23 on which second side the charged particle beam 12 is incident on the sample 23, the objective lens 26 including: a central magnetic pole 26a having a central axis coinciding with an ideal optical axis of the charged particle beam 12; an upper magnetic pole 26b; a cylindrical side-surface magnetic pole 26c; and a disk-shaped lower magnetic pole 26d, the central magnetic pole 26a having (i) an upper portion on a side of the sample 23 which upper portion has a diameter that is smaller at a position further above and (ii) a column-shaped lower portion, the upper magnetic pole 26b having a circular opening at a center thereof and being in a shape of a disk that is tapered to a center thereof and that is thinner at a position closer to a center of gravity of the central magnetic pole.
    • 本发明的目的在于提供一种带电粒子束装置,其具有更高的性能。[带电粒子束装置]具有带电粒子源11, 连接到带电粒子源11并加速由加速电源11发射的带电粒子束12的加速电源14; 以及配置成将带电粒子束12聚焦到样本23上的物镜26,物镜26位于样本23的第一侧上,第一侧与样本23的第二侧相对,第二侧 带电粒子束12入射到样本23上,物镜26包括:具有与带电粒子束12的理想光轴重合的中心轴的中心磁极26a; 一个上磁极26b; 圆柱形侧表面磁极26c; 以及圆盘状的下侧磁极26d构成,中央磁极26a具有:(i)上侧部分的上部直径在更上方的位置小的样品23侧;以及(ii) 上磁极26b在其中心处具有圆形开口,并且呈圆盘形状,该圆盘向其中心渐缩,并且在靠近中心磁极的重心的位置处变薄 。