Patent ID: 7375330

Claim:
Charged particle beam equipment comprising: a charged particle beam source for generating a charged particle beam; a specimen stand for holding a specimen; a lens system for focusing the charged particle beam onto the specimen; a scanner for scanning the charged particle beam on the specimen; a deflector for deflecting the charged particle beam; a detector for detecting a specimen signal generated from the specimen by irradiation of the charged particle beam thereto; an image processing unit for processing an image; and a display unit for displaying a specimen image, wherein a ratio of a control amount of said deflector to a visual field moving amount is calculated at the same accuracy as an accuracy of measurement of the specimen having a known periodical structure, using a magnification error of a first magnification derived by extracting a periodical dimension by said image processing unit from an enlarged image of the specimen having the known periodical structure recorded at the first magnification, and the visual field moving amount, and the visual field moving amount measured by said image processing unit from a reference image and an evaluation image, said reference image being an enlarged image of the specimen having a non-periodical structure recorded at the first magnification, and said evaluation image being an enlarged image of the specimen having a non-periodical structure recorded at the first magnification with a visual field being moved by controlling said deflector.