Patent ID: 7605381
Filing Date: 2009-10-20
Classification: H01J

Abstract:
1. A charged particle beam apparatus comprising: a charged particle source; an optical element for adjusting a charged particle beam emitted by the charged particle source; an alignment deflector for aligning the axis of the charged particle beam with respect to the optical element; a control device for calculating an alignment correction value of the alignment deflector based on an image movement amount detected when the optical element is varied and a calculation formula indicating that a value obtained based on a calculation of a proportion of a parameter indicating a change amount of the image movement amounts before and after supplying a predetermined signal to the alignment deflector, with respect to the predetermined signal is equal to a value obtained based on a calculation of a proportion of the image movement amounts before supplying a predetermined signal to the alignment deflector, with respect to the alignment correction value; and selecting means for selecting whether or not to calculate the parameter, wherein the control device calculates the parameter based on images before and after supplying the predetermined signal to the alignment deflector to calculate the alignment correction value based on the calculated parameter and the calculation formula, when calculating the parameter is selected by the selecting means, wherein the control device calculates the alignment correction value based on the calculation formula and the parameter which is stored in a memory in advance, when calculating the parameter is not selected by the selecting means.