Patent ID: 8698105
Filing Date: 2014-04-15
Classification: H01J

Abstract:
1. A charged particle beam apparatus comprising: a charged particle source configured to discharge a charged particle beam; charged particle optics that adjusts the charged particle beam on the basis of an input voltage value; scanning means for moving an irradiation point of the charged particle beam with respect to a sample; observing means for obtaining an image of a surface of the sample irradiated with the charged particle beam; and a control unit that sets an adjusted input voltage value to the charged particle optics, the control unit comprising spot pattern forming means for sequentially forming spot patterns at different positions on the sample surface in accordance with different voltage values input to the charged particle optics, and spot pattern analyzing means for analyzing the spot patterns on the image and selecting the adjusted input voltage value corresponding to a spot pattern having the smallest outer diameter and/or the most circular shape of the spot patterns.