Patent ID: 7388198

Claim:
An electron microscope comprising: an electron gun for emitting an electron beam; a condenser lens for focusing the beam onto a specimen; first deflection means for deflecting the beam hitting the specimen to vary electron beam position on the specimen; an energy filter for energy-dispersing the electron beam ejected from the specimen in a given direction to form a spectrum; a projector lens for projecting the spectrum formed by the filter onto an image detector; second deflection means for deflecting the beam ejected from the specimen in such a way that the spectrum is projected onto the detector irrespective of the electron beam position on the specimen said first deflection means has a first deflector disposed between the electron gun and the specimen and a deflection signal supply circuit for supplying a beam deflection signal to a power supply that drives the first deflector; said second deflection means has a second deflector disposed between the specimen and the image detector and a spectral position correcting signal supply circuit for supplying a spectral position correcting signal to a power supply that drives the second deflector; said spectral position correcting signal supply circuit for producing a spectral position correcting signal corresponding to said beam deflection signal; and said spectral position correcting signal supply circuit having a scanning direction rotating circuit for rotating said beam deflection signal and a scanning amplitude varying circuit for varying the amplitude of the beam deflection signal rotated by the scanning direction rotating circuit.