Patent ID: 7964856

Claim:
An ion implanting apparatus which performs an ion implantation by irradiating an ion beam having passed through a separation slit to a substrate, the ion implanting apparatus comprising: (a) an ion source that generates plasma containing a desired type of ion to be implanted into the substrate; (b) an extraction electrode system that extracts an ion beam having a rectangular section and containing the desired type of ion from the plasma generated from the ion source; (c) a mass-separation electromagnet that performs a mass-separation by bending the extracted ion beam in a thickness direction so as to derive the ion beam containing the desired type of ion; and (d) the separation slit that receives the ion beam having passed through the mass-separation electromagnet and that allows the desired type of ion to selectively pass therethrough, wherein the separation slit is operable to vary a shape of a gap through which the ion beam passes, wherein the separation slit includes a first slit and a second slit that are disposed on both sides in a thickness direction of the ion beam so as to be opposed to each other with an interval therebetween, wherein the first slit and the second slit respectively include a plurality of small slits that are separated in a width direction of the ion beam, wherein the small slits are arranged so that a gap through which the ion beam passes is not formed between the small slits that are adjacent to each other in a width direction, and wherein the small slits are operable to move independently in a thickness direction.