Patent ID: 8431897

Claim:
A transmission electron microscope for obtaining a high-angle scattering image or a dark-field image from electrons transmitted through a specimen, said transmission electron microscope comprising: a scintillator for converting signals representing the electrons transmitted through the specimen into optical signals; a photodetector for detecting the optical signals emanating from the scintillator; and plural optical fibers for guiding optical outputs from the scintillator to segments of the photodetector, the optical fibers being grouped into plural fiber bundles which are connected with respective ones of the segments of the photodetector, wherein said optical fibers are divided into a first group of optical fibers whose respective first ends are connected with said scintillator and a second group of optical fibers whose respective first ends are connected with said photodetector, wherein second ends of the optical fibers of the first group are connected with second ends of the optical fibers of the second group at coupling positions, and wherein the optical fibers of the second group on a side of the photodetector can be rotated about the coupling positions.