Patent ID: 8164067
Filing Date: 2012-04-24
Classification: H01J

Abstract:
1. A charged particle beam device for inspecting a specimen, comprising: a charged particle beam source adapted to generate a primary charged particle beam; an objective lens device adapted to direct the primary charged particle beam onto the specimen; and a detector device comprising one or more charged particle detectors adapted to detect a secondary charged particle beam generated by the primary charged particle beam at the specimen and passing through the objective lens device, the secondary charged particle beam comprising a first group of secondary charged particles starting from the specimen with high starting angles and a second group of secondary charged particles starting from the specimen with low starting angles; wherein at least one of the one or more charged particle detectors is adapted to detect depending on the starting angles one group of the first and the second groups of secondary charged particles, wherein the objective lens device is adapted to generate a first crossover of the first group of secondary charged particles and a second crossover of the second group of secondary charged particles, and wherein a first charged particle detector of the one or more charged particle detectors is positioned substantially on or adjacent to the first crossover.