Patent ID: 6365897
Filing Date: 2002-04-02
Classification: H01J

Abstract:
An inspection device, comprising:an electron gun emitting an electron beam; an electron beam optical system causing said electron beam to irradiate an irradiation region on a surface of a specimen; a detector disposed at a position facing an inspection device to detect at least one of second order electrons and reflected electrons reflected by said irradiation region; a projection optical system disposed at a position between said inspection device and said detector, said projection optical system projecting said at least one of said second order electrons and said reflected electrons onto a detection surface within said detector, said at least one of said second order electrons and said reflected electrons corresponding to an observation region within said irradiation region; a magnification controller connected to said electron beam optical system, said magnification controller controlling the size of said observation region and the magnification of said projection optical system; and an irradiation controller connected to said electron gun, said irradiation controller controlling the current density of said irradiation region based on the size of said observation region.