Patent ID: 8639463
Filing Date: 2014-01-28
Classification: G01N,H01J,H01L

Abstract:
1. An electron beam apparatus for inspecting a pattern on a sample using multiple electron beams, comprising: a plurality of primary electro-optical systems for irradiating multiple primary electron beams on a surface of the sample, each of the primary electro-optical systems comprising an electron gun having an anode and an objective lens; a plurality of secondary electro-optical systems associated with the respective primary electro-optical systems, for inducing secondary electrons emitted from a surface of the sample by irradiation of the primary electron beams; and a plurality of detectors associated with the respective secondary electro-optical systems, each for detecting the secondary electrons and generating electric signals corresponding to the detected electrons, wherein the anodes of the electron guns of the primary electro-optical systems comprise an anode substrate in common having multiple holes corresponding to the axes of the respective primary electro-optical systems, and wherein the anode substrate has metal coatings around the respective holes, to which power is independently supplied so that anode currents flowing through the anodes are independently controlled.