Patent ID: 7355174
Filing Date: 2008-04-08
Classification: H01J

Abstract:
1. A charged-particle beam emitting device, comprising: a charged-particle source, a charged-particle optical system including a plurality of lenses for converging a primary charged-particle beam and scanning said primary charged-particle beam on a sample, said primary charged-particle beam being emitted from said charged-particle source, detecting means for detecting signal particles generated from said sample by said scanning of said primary charged-particle beam, optical-axis adjusting means for adjusting optical axis of said primary charged-particle beam, and a control unit for controlling said plurality of lenses, sample image being acquired by using said signal particles detected by said detecting means, wherein said control unit has a control mode of simultaneously varying control values for said plurality of lenses with reference to respective set values therefor and at ratios determined in correspondence with energy of said primary charged-particle beam passing through said respective lenses.