Patent ID: 6979821
Filing Date: 2005-12-27
Classification: H01J

Abstract:
1. A scanning electron microscope comprising: an electron source for generating an electron beam; a magnetic field type object lens for focusing said electron beam; a detector arranged on an electron source side of a focused magnetic field of said object lens; a negative voltage applying power source applying a negative voltage to a sample, said object lens being formed for leaking a magnetic field toward a sample side, said detector or a conductor plate emitting a secondary electron by collision of a reflected electron being arranged in a direction toward which said reflected electron emitted from said sample in a direction other than an opening of said object lens for passing said electron beam is deflected by an electric field formed between said sample and said object lens and said leaking magnetic field, wherein a plurality of said detectors are arranged at positions in axial symmetry with respect to an optical axis of said electron beam.