Patent ID: 9406480
Filing Date: 2016-08-02
CPC Classification: G01N,H01J,H01L

Claim Text:
1. A method of compensating a position of an X stage of an X-Y stage of an electron beam apparatus during inspection of a sample on the X-Y stage, the method comprising: i) setting a constant target speed of the X stage; ii) setting in response to the set target speed, a linear function with regard to time, representing target positions of the X stage in the X direction during every X direction scanning period; iii) measuring actual positions of the X stage in the X direction during an X direction scanning period of the inspection; iv) calculating differences between the target positions and the measured actual positions respectively corresponding to the target positions for the X direction scanning period; v) calculating an average of the calculated differences; vi) combining the averages with the corresponding target positions to form combined target positions; and vii) using the combined target positions to adjust actual positions of the X stage during a next X direction scanning period of the inspection.