Patent ID: 7381951

Claim:
A charged particle beam adjustment apparatus comprising: a charged particle source; an objective lens for focusing the charged particle beam released from the charged particle source and radiating the focused charged particle beam on a sample; a charged particle optical system for scanning the charged particle beam on the sample; a detector for detecting the secondary signal particles emitted from the sample by scanning the charged particle beam; a tilt deflector for deflecting the charged particle beam out of the axis of the objective lens and tilting the charged particle beam with respect to the optical axis of the objective lens; and a control unit for controlling the charged particle optical system; wherein the control unit stores a signal amount to be applied to the tilt deflector in accordance with a selected tilt angle of the charged particle beam, compares an image acquired in a state in which the charged particle beam is not tilted by the tilt deflector with an image acquired in a state in which the charged particle beam is tilted by the tilt deflector by the selected tilt angle to determine a real tilt angle of the charged particle beam, and corrects the signal amount on the basis of the determined real tilt angle.