Patent ID: 8153969
Filing Date: 2012-04-10
Classification: G01N,H01J

Abstract:
1. A review apparatus which acquires an image by detecting secondary electron or back scattering electron generated by irradiating an electron beam to a sample, the apparatus comprising: a beam source for generating a primary charged particle beam; a scan deflector for scanning the primary charged particle beam; a primary deflection unit for deflecting the primary charged particle beam; a secondary deflection unit for separating the secondary electron or the backscattering electron from the primary charged particle beam, wherein said secondary deflection unit is disposed between the beam source and the scan deflector; a primary detector disposed between the primary deflection unit and the secondary deflection unit; a plurality of secondary detectors disposed on a side of the sample near the primary deflector unit, the secondary deflector unit and the scan deflector; and an objective lens for focusing said primary charged particle beam on the sample.