Patent ID: 8791415
Filing Date: 2014-07-29
Classification: H01J

Abstract:
1. An electron microscope device, comprising a scanning electron microscope which has scanning means for scanning an electron beam and an electron detector for detecting an electron issued from a specimen where the electron beam is projected for scanning, and acquires a scanning electron image based on a detection result from said electron detector, and comprising an optical microscope for projecting an illumination light to said specimen, for receiving a reflection light from said specimen, and for acquiring an optical image, wherein said electron detector comprises an arrangement of layers, one after another, that includes a fluorescent substance layer for performing photoelectric conversion, a wavelength filter giving restriction so that all or almost all of wavelength ranges of fluorescent lights from said fluorescent substance layer can be transmitted, and a wavelength detecting element for receiving said fluorescent light transmitted through said wavelength filter and for performing photoelectric conversion, wherein said illumination light is designed to have a wavelength deviated from a transmission wavelength range of said wavelength filter, and wherein said illuminating light and said electron beam are projected at the same time, and the optical image and the scanning electron image can be acquired at the same time.