Patent ID: 7507962
Filing Date: 2009-03-24
Classification: H01J

Abstract:
1. An electron-beam device having an optical axis, comprising: a beam generator that generates an electron beam; an anode to which an anode potential is applied and by which electrons generated by said beam generator are accelerated to said anode potential; a beam guiding tube which is on said anode potential and in which energy of said electrons is maintained; an objective lens that focuses the electron beam on an object; an electrode which together with said object is on a potential that is lower in relation to said potential of said beam guiding tube so that said electrons in said electron beam are slowed down to a desired energy before striking said object; at least one detector positioned along the optical axis within said beam guiding tube and that detects at least one of: electrons scattered on the object and electrons emitted by the object, wherein said at least one detector has a hole on said optical axis and includes a tube extending in the direction of said optical axis.