Patent ID: 9208995
Filing Date: 2015-12-08
Classification: H01J

Abstract:
1. A charged particle beam apparatus comprising: a charged particle source which emits a charged particle beam; a charged particle optical system which focuses the charged particle beam and controls an optical axis; a lens barrel which holds the charged particle source and the charged particle optical system; a first housing which is connected to the lens barrel and into which the charged particle beam is emitted; a second housing which is recessed to inside the first housing from an opening of the first housing; a first diaphragm which is arranged on the optical axis and separates a space inside the lens barrel from a space inside the first housing, and through which the charged particle beam passes; and a second diaphragm which is arranged on the optical axis and separates spaces inside and outside a recessed section of the second housing from each other, and through which the charged particle beam passes, wherein a space surrounded by the first housing and the second housing is depressurized, and a sample arranged inside the recessed section of the second housing is irradiated with the charged particle beam.