Patent ID: 7855364
Filing Date: 2010-12-21
Classification: H01J

Abstract:
1. A projection electronic microscope comprising: an irradiation system for emitting a primary electron beam irradiated to a sample; and a projection/image formation optical system for guiding a second electron beams emitted from the sample with the irradiation of the primary electron beam to a detection system, said projection/image formation optical system including a zoom type transfer lens system having a first zoom lens and a second zoom lens, said first zoom lens including a plurality of electrodes, wherein a predetermined electrode of said plurality of electrodes is made thicker and is applied with a positive voltage to form a space having zero field strength and a high positive potential between said first zoom lens and said second zoom lens, and a cross-over by said first zoom lens is defined in said space within a zooming range, and said first zoom lens is positioned closer to the sample than said second zoom lens.