Patent ID: 8067733
Filing Date: 2011-11-29
Classification: H01J

Abstract:
1. A scanning electron microscope comprising: an electron source; an objective lens for focusing an electron beam emitted from the electron source on a sample; a monochromator that is disposed between the electron source and the objective lens and that monochromatizes energy of the electron beam, a first focusing lens for adjusting focusing of the electron beam entering the monochromator; a first astigmatism correcting lens for correcting astigmatism of the electron beam entering the monochromator, wherein the first focusing lens and the first astigmatism correcting lens are between the electron source and the monchromator; and an adjustment means for obtaining an image of an electron-beam adjustment sample disposed where the electron beam is focused in the monchromator, and based on the obtained image, driving the first focusing lens and the first astigmatism correcting lens so that focusing and astigmatism of the electron beam in a location where the electron beam in the monochromator is focused are adjusted.