Patent ID: 7385196

Claim:
A charged particle beam apparatus comprising: a scanner for scanning a charged particle beam on an object, said object having a width; a first detector for detecting charged particles emitted from the object; a second detector for detecting a focus condition of the charged particle beam or an electrification condition of a sample; and a processor for calculating the width of a pattern of the sample by adding or subtracting a corrected based on the detected focus condition or value corresponding to a diameter of the electrification condition, from a value obtained by measuring the width of the line profile formed based on a line profile based on the charged particles emitted from the object, said line profile having a width and for calculating the width of a pattern of the sample based on a line profile which is formed by the detected charged particles; wherein the processor calculates the width value of a pattern of the sample by adding or subtracting a beam diameter value, and corrects the beam diameter value or width value of the pattern of the sample based on a focus condition of the charged particle beam.