Patent ID: 7435976

Claim:
The ion beam apparatus comprising: an ion source which extracts an ion beam; a mass separation electromagnet which separates an ion beam of desired mass from the ion beam extracted from the ion source; a scanner which scans the ion beam that has been passed through the mass separation electromagnet around a given scan center within a given scan surface; an electrostatic deflector which electrostatically deflects the ion beam ejected from the scanner through 90° so that an ion beam of desired energy travels in a direction perpendicular to the scan surface within a circular-arc-shaped deflection zone centered on the scan center; and a scanning mechanism which retains a target for ion implantation and which mechanically, reciprocally moves the target in a direction in which the target crosses the ion beam ejected from the electrostatic deflector at a given angle wherein said scanning mechanism moves said target in a direction parallel to a surface of said target; wherein said scanner has a pair of mutually-parallel scan electrodes, and a scan power source which applies a scan voltage Vs expressed by V s =ct/(I−c 2 t 2 ) 1/2 (“c” is a constant, and “t” is time) between said pair of scan electrodes.