Patent ID: 9564292
Date: 2017-02-07
CPC Classifications: H01J

Claim:
1. An ion beam measuring device comprising: a mask comprising a single plate-shaped member defining an xy plane that is perpendicular to an ion beam traveling direction, the single plate-shaped member comprising a plurality of apertures configured to shape an original ion beam into a measuring ion beam comprising at least one first y beam part and at least one second y beam part each elongated in a y direction that is perpendicular to the ion beam traveling direction and at least one x beam part elongated in an x direction that is perpendicular to the ion beam traveling direction and the y direction, the plurality of apertures including at least one first y slit and at least one second y slit elongated in the y direction and shaping the at least one first y beam part and the at least one second y beam part, respectively, and at least one x slit elongated in the x direction and shaping the at least one x beam part, the at least one first and second y slits and the at least one x slit formed in the xy plane of the single plate-shaped member, the mask located at a retreat position away from the original ion beam during ion implantation onto a substrate and located at a measurement position to generate the measuring ion beam; a detection unit configured to detect x-direction positions of the first and second y beam parts and a y-direction position of the at least one x beam part, the detection unit comprising a moving detector arranged downstream of the mask in the ion beam traveling direction and that is movable in at least the x direction so as to traverse the measuring ion beam, the moving detector configured to detect the x-direction positions of the at least one first and second y beam parts, and a fixed detector arranged downstream of the moving detector in the ion beam traveling direction, the fixed detector comprising an array of detection elements arranged in the y direction and configured to detect the y-direction position of the at least one x beam part based on a y-direction position at which the at least one x beam part arrives on the array of detection elements; and a beam angle calculating unit that is configured to calculate an x-direction beam angle using the x-direction positions and a y-direction beam angle using the y-direction position, wherein the original ion beam is a scanned ion beam scanned over a scanning range extending in the x direction, the at least one first y slit is located at a first end part of an irradiated region of the single plate-shaped member on which the scanned ion beam is incident, the at least one second y slit is located at a second opposite end part of the irradiated region, and the at least one x slit is located between the at least one first y slit and the at least one second y slit, the at least one first y slit, the at least one second y slit, and the at least one x slit are arranged along the x direction within the irradiated region of the single plate-shaped member.