Patent ID: 7491945
Filing Date: 2009-02-17
Classification: B82Y,H01J

Abstract:
1. A charged particle beam apparatus comprising: a charged particle beam generator which generates a charged particle beam; a projection optical system which generates a lens field to focus the charged particle beam on an external substrate; and a single stage deflector arranged so as to surround an optical axis of the charged particle beam, the deflector generating a deflection field which is superposed on the lens field to deflect the charged particle beam and to control a position to irradiate the substrate, the deflector, comprising a pair of opposed electrodes, being configured so that space between surfaces of the opposed electrodes across the optical axis changes stepwise in a direction of the optical axis and an intensity of the deflection field is changed in a direction of the optical axis in accordance with an angle with which the charged particle beam should fall onto the substrate.