Patent ID: 8455823

Claim:
A charged particle beam device, comprising: a charged particle source; a deflector which scans a sample with a primary charged particle beam emitted from the charged particle source; an objective lens which converges the primary charged particle beam emitted from the charged particle source; a detector which detects at least secondary electrons which are generated from the sample by irradiation with the primary charged particle beam; a memory which stores a detection signal from the detector; and a control apparatus which processes the detection signal, wherein: the detector is a charge coupled device (CCD) which includes detection elements arranged in a planar manner; the detection elements are configured for discriminating and detecting electrons having energy differences which are generated from a primary electron beam irradiation point of the sample; the detector detects, for each irradiation position on the sample, distribution information of the secondary electrons emitted from the irradiation position; the memory stores the irradiation position and the distribution information of the signal electrons emitted from the irradiation position in association with each other; and the control apparatus configured to calculate a pixel value for each irradiation position on a basis of the stored distribution information of the signal electrons for each irradiation position, and to form an image by associating the calculated pixel value with each irradiation position.