Patent ID: 7435957

Claim:
A charged particle beam equipment, comprising: a charged particle beam source for generating a charged particle beam; a specimen stage for holding and moving a specimen; a lens system for focusing said charged particle beam on said specimen; a scanner for scanning said charged particle beam on said specimen; a beam deflector for deflecting said charged particle beam; a detector for detecting a specimen signal generated by said specimen upon irradiation by said charged particle beam; an arithmetic processing part for an image operation; and a display part for displaying a specimen image, wherein said scanner scans said charged particle beam in accordance with reference magnification and object magnification, said beam deflector deflects said charged particle beam to which said scanning is carried out in accordance with setting of said reference magnification and object magnification at a predetermined value, and said arithmetic processing part calculates magnification error at said object magnification in accordance with the following formula: measured displacement amount at target magnification—target magnification×(displacement amount at reference magnification/reference magnification).