Patent ID: 7820978
Filing Date: 2010-10-26
Classification: B82Y,H01J

Abstract:
1. A charged-particle beam system comprising: a charged-particle beam source for producing a charged-particle beam; a demagnifying lens for demagnifying dimensions of the charged-particle beam produced from the charged-particle beam source; an objective lens for focusing the charged-particle beam whose dimensions have been demagnified by the demagnifying lens onto a surface of a target; a first deflector for producing a deflection field disposed in a stage preceding the demagnifying lens or close to an object plane of the objective lens; a second deflector for producing a deflection field placed such that a deflection field produced by the second deflector itself is totally or partially superimposed on a lens field produced by the objective lens; and a third deflector for producing a deflection field disposed in a stage following the second deflector, wherein intensity distribution in the deflection field is selected by adjusting dimensions, positions, and deflection voltages of said first, second, and third deflectors such that deflection comatic aberrations arising from the deflectors cancel each other out and, at the same time, deflection chromatic aberrations arising from the deflectors cancel each other out while determining a beam incidence position at an image plane of the objective lens.