Patent ID: 8692194

Claim:
An electron microscope device, comprising a scanning electron microscope and an optical microscope, wherein said scanning electron microscope has a scanner and an electron detector for detecting electrons issued from a specimen scanned over by an electron beam, and said scanning electron microscope acquires a scanning electron image based on a detection result from said electron detector, and said optical microscope has a light emitting source for illuminating an illumination light, and said optical microscope illuminates said illumination light to said specimen, and acquires an optical image by receiving a reflection light from said specimen, and wherein said electron detector has a fluorescent substance layer for electron-light conversion, a wavelength filter having a transmission wavelength range and a non-transmission wavelength range for restricting so that all or almost all of wavelength ranges of the fluorescent light from said fluorescent substance layer passes through, and a wavelength detecting element for receiving said fluorescent light passing through said wavelength filter and performing optical-electric conversion, wherein said illumination light includes a wavelength range that passes through said wavelength filter and wherein the light amount of said wavelength range does not exceed a limit of deterioration of said scanning electron image, thereby allowing simultaneous use of said illumination light and said electron beam, wherein said light emitting source is an LED, and said LED has a light emission property wherein light intensity of a frequency spectrum included in the transmission wavelength range of said wavelength filter is lower than light intensity of a frequency spectrum included in said non-transmission wavelength range.