Patent ID: 9613781
Date: 2017-04-04
CPC Classifications: H01J

Claim:
1. A scanning electron microscope comprising: an electron gun for generating an electron beam; an irradiation unit for irradiating a sample with the electron beam while scanning the sample by moving a position of irradiation with the electron beam on the sample; and a detector for detecting electrons generated from the sample in accordance with the irradiation of the sample with the electron beam, wherein the detector includes: a micro-channel plate for multiplying secondary electrons generated in accordance with incidence of the electrons generated from the sample, the micro-channel plate having an input face located at a position of arrival of the electrons from the sample, and an output face opposing the input face and outputting the multiplied secondary electrons; a dynode disposed on the opposite side to the input face with respect to the output face and configured to multiply the secondary electrons outputted from the output face, the dynode being set at a potential higher than a potential of the output face; and an anode disposed in a space from the dynode to an intermediate position between the output face and the dynode and configured to collect the secondary electrons multiplied by the dynode, the anode having an aperture for letting the secondary electrons outputted from the output face, pass toward the dynode, the anode being set at a potential higher than the potential of the dynode.