Patent ID: 8354638

Claim:
An electron detection device for detecting electrons emitted from a sample, comprising: one scintillator arranged to face the sample, the scintillator having an opening through which an electron beam emitted from an electron gun passes; a plurality of photoguides of the same shape, which are bonded to a side of the scintillator closer to the electron gun and disposed symmetrically about an optical axis of the electron detection device; and a photomultiplier tube which is connected to one side of each of the photoguides, the side being opposite to that closer to the optical axis, and converts light into electrical signals, the light being emitted by the scintillator and transmitted to the photomultiplier tube through the photoguide, wherein the photoguides are joined so as to equally divide the scintillator symmetrically about the optical axis, and a position and an area of a portion bonded to the scintillator, in each of the photoguides, are the same with one another.