Patent ID: 9684245
Date: 2017-06-20
CPC Classifications: G03F,H01J

Claim:
1. An exposure apparatus comprising: a plurality of charged particle beam sources; a stage positioned to hold an irradiation target of the plurality of charged particle beam sources; a substrate between the plurality of charged particle beam sources and the stage, the substrate having a plurality of beam passing holes and a corresponding plurality of opening hole groups, the plurality of beam passing holes being arranged such that a charged particle beam of each of the plurality of charged particle beam sources passes through a corresponding one of the beam passing holes, each of the opening hole groups having a plurality of opening holes provided around the corresponding beam passing hole; and a plurality of charged particle detectors on the same side of the substrate as the plurality of charged particle beam sources, each of the charged particle detectors arranged to detect charged particles that have passed through a corresponding one of the opening hole groups after having been scattered from the irradiation target, wherein inner diameters of the beam passing holes are larger than inner diameters of the plurality of opening holes; and wherein the substrate further includes, at a different area from the opening hole groups, a reducing portion that includes a plurality of non-through hole groups that open toward the stage and do not penetrate the substrate, each non-through hole group provided around a corresponding opening hole group.