Patent ID: 9362087
Filing Date: 2016-06-07
CPC Classification: H01J

Claim Text:
1. A single-beam apparatus, comprising: an electron source emitting primary electrons along an optical axis of said single-beam apparatus and said primary electrons form a primary electron beam; a gun aperture plate below said electron source and having at least one first opening, wherein one of said first openings is aligned with said optical axis and limits a current of said primary electron beam to a first current value; a condenser lens below said gun aperture plate and aligned with said optical axis; a beam-limit aperture plate below said condenser lens and having at least one second opening, wherein one of said second openings is aligned with said optical axis and limits said current of said primary electron beam to a second current value; a magnetic objective lens below said beam-limit aperture plate and aligned with said optical axis; a first scanning deflector inside a bore of said magnetic objective lens; a first detector below said magnetic objective lens and having a through hole, wherein said through hole is on an electron detection plane of said first detector and aligned with said optical axis so that said primary electron can pass through; an attraction electrode beside said first detector; and a sample stage below said first detector and said attraction electrode and for supporting a sample and making a being-inspected surface thereof upturned,