Patent ID: 8008638
Filing Date: 2011-08-30
Classification: H01J

Abstract:
1. An ion implantation apparatus which conducts ion implantation with respect to wafers, comprising: a hub which is capable of rotating around a first rotational axis; and multiple wafer holders which are provided on the hub, and which hold wafers, wherein the wafer holders comprise a support body which is capable of rotating around a second rotational axis that crosses the first rotational axis, and at least three or more holding pins which are provided on the support body, which contact the outer periphery of the wafer, and which hold the wafer in a fixed position relative to the support body; the holding pins respectively contact the outer periphery of the wafer, and have an inclined side face which inclines so that it approaches a center axis of the wafer as it moves away from the wafer holder; the holding pins include a first holding pin in which the angle of inclination of the inclined side face relative to a line that is parallel to the center axis of the wafer is θ the angle of inclination θ the protrusion amount of the second holding pin relative to the wafer is larger than the protrusion amount of the first holding pin relative to the wafer.