Patent ID: 8530837
Filing Date: 2013-09-10
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; a retarding field device adapted to accelerate secondary charged particles starting from the specimen, wherein a first group of the secondary charged particles comprises secondary charged particles starting from the specimen with high starting angles, and a second group of the secondary charged particles comprises secondary charged particles starting from the specimen with low starting angles; a first detector device, comprising wherein the objective lens device is adapted such that particles with different starting angles from the specimen exhibit crossovers at substantially the same distance from the specimen, forming a common crossover, and a first aperture located between the objective lens and the detector, having an opening with a diameter equal to or smaller than the central opening in the detector device, and which is provided in a position which fulfills at least one of the following properties: