Patent Number: 
Section: claims

1. An ion implanter which emits an ion beam from an ion source and in which an ion implanting is performed to a substrate disposed in a process chamber, wherein the ion beam has a positive charge and a substantially rectangular cross section or a substantially long ellipsoidal cross section having a long side direction and a short side direction, the ion implanter comprising:a beam current measuring device that measures a beam current density distribution of the ion beam in the long side direction;a deflecting electrode that deflects at least a part of the ion beam in the long side direction toward the short side direction, based on a result measured by the beam current measuring device; anda shield member that partially shields the ion beam deflected by the deflecting electrode,wherein the deflecting electrode includes a plate electrode and an electrode group including a plurality of electrodes, the electrode group being disposed to face the plate electrode so as to interpose the ion beam between the plate electrode and the electrode group, the plate electrode being positioned along a long side direction that defines the cross section of the ion beam, and the electrode group being positioned along the long side direction of the ion beam, wherein the plurality of electrodes of the electrode group are commonly positioned on a same long side direction of the ion beam, opposite the long side direction where the plate electrode is positioned,the plate electrode is electrically grounded,the plurality of electrodes are electrically independent from each other, andeach of the plurality of electrodes is connected to an independent power source from other power sources to perform a potential setting. 2. The ion implanter according to claim 1, whereinthe ion beam in the long side direction has a longer size than the substrate, andthe substrate is transferred along the short side direction of the ion beam when the ion implanting is performed to the substrate. 3. The ion implanter according to claim 2, whereinwhen the result measured by the beam current measuring device does not satisfy with a desired value, the plurality of electrodes is set so that all electrodes has a negative potential. 4. The ion implanter according to claim 2, whereinwhen the result measured by the beam current measuring device is not a desired value, the plurality of electrodes configuring the electrode group is set so that some electrodes are at a negative potential and the remaining electrodes are at ground potential. 5. The ion implanter according to claim 2, whereinthe plurality of power sources are connected to a bias power source to collectively set potential of the plurality of power sources based on ground potential. 6. The ion implanter according to claim 5, whereinthe bias power source collectively sets the potential of the plurality of power sources at a negative potential. 7. The ion implanter according to claim 1, whereinwhen the result measured by the beam current measuring device does not satisfy with a desired value, the plurality of electrodes is set so that all electrodes has a negative potential. 8. The ion implanter according to claim 1, whereinwhen the result measured by the beam current measuring device is not a desired value, the plurality of electrodes configuring the electrode group is set so that some electrodes are at a negative potential and the remaining electrodes are at ground potential. 9. The ion implanter according to claim 1, whereinthe plurality of power sources are connected to a bias power source to collectively set potential of the plurality of power sources based on ground potential. 10. The ion implanter according to claim 9, whereinthe bias power source collectively sets the potential of the plurality of power sources at a negative potential.