Patent ID: 7834317
Filing Date: 2010-11-16
Classification: G03F,H01J

Abstract:
1. A scanning electron microscope comprising: electron beam illumination means for irradiating an electron beam on a desired region of a specimen while scanning the electron beam thereon; digital image acquisition means for detecting secondary charged particles generated from a surface of the desired region of said specimen under scanning irradiation of the electron beam by said electron beam illumination means and digitizing a detected signal at a predetermined sampling clock so as to acquire a digital image of the desired region of said specimen; image processing means for processing the digital image acquired by said digital image acquisition means; and control means for controlling said electron beam illumination means, said digital image acquisition means and said image processing means; wherein said digital image acquisition means obtains images of a plurality of frames by scanning the electron beam plural times on the desired region of said specimen, such that frame images acquired in sampling positions are added to frame images acquired at positions displaced or shifted by under 1 pixels from the frame images acquired in the sampling positions in a X-direction, Y-direction or diagonal direction; and wherein said image processing means processes said images of said plurality of frames.