Patent ID: 8294118
Filing Date: 2012-10-23
Classification: H01J

Abstract:
1. A method for adjusting an optical axis in a charged particle beam device by deflecting a charged particle beam emitted from a charged particle source to perform optical axis adjustment, comprising the steps of: changing adjustment conditions of an optical element adapted to adjust said charged particle beam to thereby capture a plurality of images with said adjustment conditions different; selecting from said plurality of captured images an image whose image quality is tolerable or an image whose image quality is intolerable; obtaining a first image quality evaluation value on the basis of said selected image; and adjusting said optical axis when said obtained first image quality evaluation value is compared with a second image quality evaluation value obtained from an image captured by scanning said charged particle beam and said second image quality evaluation value is equal to or less than said first image quality evaluation value or is less than said first image quality evaluation value.