Patent ID: 8552371

Claim:
An apparatus for determining field-of-view conditions of a charged particle beam system, said apparatus comprising: a control condition setting unit for a charged particle beam, said control condition setting unit being configured to determine a size of field of view of said charged particle beam system on graphic data that is obtained on the basis of design data of a semiconductor device, wherein said control condition setting unit is further configured to obtain a first distance between a line segment of a pattern on the graphic data which is first positioned in a first direction from a reference point set on the graphic data, and a line segment of the pattern which is first positioned in the second direction from the reference point, the first direction and the second direction being opposite to each other, obtain a second distance between a line segment of the pattern which is the first positioned in a third direction from the reference point, and a line segment of the pattern which is first positioned in a fourth direction from the reference point, the third direction being different from the first and the second directions, and the third direction and the fourth direction being opposite to each other, perform a comparison between said first distance and said second distance, and determine a size of field of view so as to include said reference point and the two intersection points corresponding to the shorter distance of said first distance and said second distance, and so as to set a distance between said two intersection points corresponding to the shorter distance such at said shorer distance within said field of view and provided in accordance with a ratio relative to said size of field of view.