Patent ID: 9362082
Filing Date: 2016-06-07
CPC Classification: H01J

Claim Text:
1. An electron microscope comprising: an electron beam source emitting an electron beam; a monochromator having an energy filter for dispersing the electron beam according to energy and a slit plate placed on an energy dispersive plane, the slit plate being provided with plural energy-selecting slits that are different in width taken in a direction where the electron beam is dispersed; a lens system on which the electron beam impinges after the beam is monochromatized by the monochromator; a first measuring section for measuring the intensity of the electron beam emitted from the electron beam source; a second measuring section for measuring the intensity of the electron beam that has passed through an active one of the energy-selecting slits; and a slit identifying portion for identifying the active energy-selecting slit through which the beam has passed from among the plural energy-selecting slits on the basis of results of measurements made by the first and second measuring sections.