Patent Number: 
Section: abstract

A lithography apparatus includes a unit irradiating a charged particle beam; first and second aperture plate members configured to shape the beam; first and second coils configured to be arranged between the unit and the first aperture plate member, to temporarily deflect the beam, to change a direction of the beam after the temporarily deflecting, and to deflect the beam to a position where the beam passes through the first aperture plate member by the changing; a lens configured to be arranged between the first and second aperture plate members and to control a focal position of the beam having passed through the first aperture plate member; and a unit configured to calculate a difference between positions of the beam on the second aperture plate member obtained by different sets of amounts of deflection at a same focal position when a combination of one of focal positions of the beam controlled by the lens and one of sets of amounts of deflection of the beam obtained by the first and second coils is changed.