Patent ID: 7557347
Filing Date: 2009-07-07
Classification: H01J

Abstract:
1. A charged electron beam apparatus irradiating a sample with primary charged particle beam, and detecting secondary charged particles secondarily generated comprising: a stage to hold the sample; a charged particle source for generating the primary charged particle beam; a condenser lens for converging said primary charged particle beam; an objective lens for irradiating said sample with said converged primary charged particle beam; and a secondary electron conversing unit arranged between said condenser lens and said objective lens, said secondary electron conversing unit comprising: a secondary electron conversing electrode to which said secondary charged particles are collided; a first E×B deflector for deflecting the secondary electrons generated at said secondary electron conversing electrode; a second E×B deflector for reducing chromatic aberration generated in said primary charged particle beam by said first E×B deflector; and a detector for detecting said deflected secondary electrons.