Patent ID: 8880374

Claim:
A charged particle beam device configured to detect a secondary signal generated by irradiating a sample on a stage with a charged particle beam and to display an image of the sample on a display unit, the charged particle beam device comprising: a control part which calculates a positional deviation quantity between a coordinate system of the sample and a coordinate system of the stage, based on the secondary signal generated from an alignment pattern on the sample having known coordinate values in the coordinate system of the sample, to produce coordinate correction data, wherein the control part is configured to: update the coordinate correction data based on the positional deviation quantity between a first circuit pattern or a first defect as a first observation object and a reference pattern having known coordinate values in the coordinate system of the sample, and the reference pattern is compared with the first observation object, and obtain an image of a second circuit pattern or a second defect which becomes a second observation object after the first circuit pattern or the first defect by using the updated coordinate correction data, and wherein the coordinate correction data is updated when the positional deviation quantity exceeds a predetermined threshold, and the predetermined threshold is automatically set in accordance with an observation range or an observation magnification.