Patent ID: 7432515
Filing Date: 2008-10-07
Classification: B82Y,H01J

Abstract:
1. A charged particle beam lithography apparatus performing lithography by irradiating a charged particle beam on a test piece, comprising: a charged particle beam generation source; a charged particle beam forming portion including a first illumination lens, a beam limitation aperture provided in the first illumination lens, a second illumination lens, a first blanking aperture, a blanking deflector and a second blanking aperture arranged in order from the charged particle beam generation source, and which are arranged on an optical axis and through which the charged particle beam emitted from the charged particle beam generation source is transmitted; a first deflector that is arranged between the charged particle beam forming portion and the charged particle beam generation source and that deflects the charged particle beam emitted from the charged particle beam generation source; a second deflector that is arranged between the first deflector and the charged particle beam forming portion and that deflects the charged particle beam deflected by the first deflector; an imaging unit that obtains image data of the aperture; and a control portion that calculates first amounts of excitation of the first and second deflector based on the obtained image data so that the charged particle beam emitted from the charged particle beam generation source is deflected by the first deflector to intersect the optical axis and the charged particle beam deflected by the first deflector is deflected by the second deflector to advance on the optical axis, and that controls the first and second deflectors based on the calculated first amounts of excitation, wherein the imaging unit obtains image data indicating reflection of the charged particle beam from the second blanking aperture, wherein the control portion has a calculation unit and a deflector control unit, wherein the calculation unit determines a beam limitation aperture image and first and second blanking aperture images from the obtained image data indicating reflection, wherein the calculation unit determines a center position of each of the beam limitation aperture image and first and second blanking aperture images, wherein the calculation unit calculates second amounts of excitation of the first and second deflectors based on the determined center position of each of the beam limitation aperture image and first and second blanking aperture images so that at least one center position of the first and second blanking aperture images corresponds to the center position of the beam limitation aperture image, and wherein the deflector control unit controls the first and second deflectors based on the calculated second amounts of excitation.