Patent ID: 7635850
Filing Date: 2009-12-22
Classification: H01J

Abstract:
1. An ion implanter in which a traveling direction of an ion beam is set as a Z direction, two directions which are substantially orthogonal to each other in a plane that is substantially orthogonal to the Z direction are set as X and Y directions, respectively, and a ribbon-like ion beam in which a dimension in the Y direction is larger than a dimension in the X direction is transported to irradiate a substrate, thereby performing ion implantation, wherein said ion implanter comprising: an ion source that generates the ribbon-like ion beam in which the Y-direction dimension is larger than a dimension in the Y direction of said substrate; an analyzing electromagnet which, bends the ion beam from said ion source in the X direction to analyze a momentum, and which forms a focus of an ion beam of a desired momentum, in a downstream side; an analysis slit which is disposed in a vicinity of the focus of the ion beam from said analyzing electromagnet, and which cooperates with said analyzing electromagnet to analyze the momentum of the ion beam; an accelerating/decelerating device which bends the ion beam passed through said analysis slit, in the X direction by means of an electrostatic field, and which accelerates or decelerates the ion beam by means of the electrostatic field; and a substrate driving device which, at an implanting position where the ion beam passed through said accelerating/decelerating device is caused to be incident on the substrate, moves the substrate in a direction intersecting with a principal face of the ion beam, wherein said analyzing electromagnet comprises: a first coil which is a saddle-shaped coil having: one set of body portions that are opposed to each other in the X direction across the beam path through which the ion beam passes, and that cover about a half or more of one side of the ion beam in the Y direction; and one set of connecting portions that connect end portions of said body portions in the Z direction with each other, while avoiding said beam path, said first coil cooperating with a second coil to generate a magnetic field which bends the ion beam in the X direction; and said second coil which is a saddle-shaped coil having: one set of body portions that are opposed to each other in the X direction across the beam path, and that cover about a half or more of another side of the ion beam in the Y direction; and one set of connecting portions that connect end portions of said body portions in the Z direction with each other, while avoiding said beam path, said second coil being disposed overlappingly with said first coil in the Y direction, and cooperating with said first coil to generate a magnetic field which bends the ion beam in the X direction, a yoke which collectively surrounds outer sides of said body portions of said first and second coils, and wherein each of said first and second coils of said analyzing electromagnet has a configuration in which a notched portion is disposed in a fan-shaped cylindrical stacked coil while leaving said body portions and said connecting portions, said stacked coil being configured by: stacking laminations of an insulation sheet and conductor sheet in which a principal face extends along the Y direction, on an outer peripheral face of a laminated insulator, while winding the laminations in multiple turns; and forming a laminated insulator on an outer peripheral face of the stack.