Patent ID: 7439502
Filing Date: 2008-10-21
Classification: G01N,H01J

Abstract:
1. An electron bean apparatus comprising a plurality of optical systems, each of which comprises: an electron beam irradiating means, for irradiating a sample with primary electron beams, and scanning the sample by deflecting an incident angle of the primary electron beams within a prescribed range; a deflecting/separating means for deflecting secondary electron beams, which are generated by irradiation of the primary electron beams onto the sample, in a prescribed direction with respect to an optical axis of the electron beam irradiating means; and a detecting means for detecting the secondary electron beams deflected by the deflecting/separating means, wherein: said optical systems are arranged in two rows, such that paths of the secondary electron beams deflected by the deflecting/separating means do not interfere with each other; said optical systems are each capable of evaluating the sample by scanning different regions on the sample with their primary electron beams and detecting the respective secondary electron beams emitted from each of the respective regions.