Patent ID: 9006653
Filing Date: 2015-04-14
Classification: H01J

Abstract:
1. An electron microscope, comprising: an electron gun which generates an electron beam; a column which contains the electron gun and a lens; an objective lens which focuses the electron beam to irradiate a sample; a sample chamber which is positioned under the column and forms a sample space to contain the sample; a sample chamber magnetic shield provided inside the sample chamber; and an objective lens magnetic shield of a tubular shape which surrounds a periphery of the objective lens, wherein a first hole and a second hole, which face to each other in a traveling direction of the electron beam, are provided in an upper plate serving as an upper wall of the sample chamber and in an upper shield of the sample chamber magnetic shield, respectively, wherein the upper plate and the upper shield are separated from each other in the traveling direction by a prescribed gap, wherein the objective lens is held inside the first hole provided in the upper plate of the sample chamber, wherein a lower end of the objective lens is disposed at a position lower than a lower end of the upper plate of the sample chamber and proximate to the second hole provided in the upper shield of the sample chamber magnetic shield, wherein the sample is installed at a position facing the second hole, inside the sample chamber magnetic shield, and wherein the objective lens magnetic shield is positioned inside the first hole, extends along the prescribed gap and has a lower end that is connected to the upper shield of the sample chamber magnetic shield.