Patent ID: 7838832
Filing Date: 2010-11-23
Classification: H01J

Abstract:
1. An apparatus for generating a dual-energy electron beam, the apparatus comprising: a first electron beam source configured to generate a lower-energy electron beam; a second electron beam source configured to generate a higher-energy electron beam; a combining device for forming the dual-energy electron beam by combining the lower-energy and higher-energy electron beams; a first controllable electron-beam deflector configured to provide a controllable offset of a first area illuminated by the lower-energy electron beam in relation to an image data collection area; a second controllable electron-beam deflector configured to provide a controllable offset of a second area illuminated by the higher-energy electron beam in relation to the image data collection area; a moving stage holding a target substrate and moving the target substrate relative to the image data collection area; and a time delay integration detection system configured to obtain an electron image of an area even while the target substrate is moving relative to the image data collection area.