Patent ID: 7105814

Claim:
An electron microscopy system for inspecting an object positionable in an object plane of the electron microscopy system, the system comprising: an electron source for generating a primary electron beam; primary electron optics having an objective lens for focusing the primary electron beam to form a primary electron beam spot which is substantially a point spot in the object plane, and a controllable first beam deflector for deflecting the primary electron beam relative to the objective lens for scanning the primary electron beam spot across the object plane; an electron detector for detecting an electron intensity, wherein the electron detector is a two-dimensionally position-sensitive detector; secondary electron optics including the objective lens, for transferring secondary electrons emanating from the object plane in a region around the primary electron beam spot as a secondary electron beam to the electron detector, and a controller for receiving signals from the electron detector and for allocating the received signals to a position in an image based upon a location of the primary electron beam spot in the object plane.