Patent Number: 
Section: claims

1. A charged particle beam apparatus, comprising:a charged particle source;an electrostatic deflection device which scans a charged particle beam emitted from the charged particle source; andan electrostatic deflection circuit which controls the electrostatic deflection device, wherein:the electrostatic deflection circuit includes a first operational amplifier with a first amplification factor and a second operational amplifier with a second amplification factor which is lower than the first amplification factor;the electrostatic deflection circuit controls the electrostatic deflection device to scan by using the first operational amplifier, if a scanning width of the charged particle beam is equal to or wider than a predetermined width; andthe electrostatic deflection circuit controls the electrostatic deflection device to scan by using the second operational amplifier, if the scanning width of the charged particle beam is less than the predetermined width. 2. The charged particle beam apparatus according to claim 1,wherein the charged particle beam apparatus is a scanning electron microscope or a focused ion beam device. 3. A charged particle beam apparatus, comprising:a charged particle source;an electrostatic deflection device which scans a charged particle beam emitted from the charged particle source; andan electrostatic deflection circuit which controls the electrostatic deflection device, wherein:the electrostatic deflection device includes a plurality of electrostatic deflecting boards which are arranged in a ring and an electrostatic field is generated in the ring; andthe electrostatic deflecting circuit includes at least two operational amplifying circuits and switches the at least two operational amplifying circuits based on a scanning width of the charged particle beam. 4. The charged particle beam apparatus according to claim 3, wherein:the at least two operational amplifying circuits include a first operational amplifier with a first amplification factor and a second operational amplifier with a second amplification factor;the electrostatic deflection circuit controls the electrostatic deflection device to scan the charged particle beam by using the first operational amplifier if the scanning width of the charged particle beam is equal to or wider than a predetermined width; andthe electrostatic deflection circuit controls the electrostatic deflection device to scan the charged particle beam by using the second operational amplifier if the scanning width of the charged particle beam is less than the predetermined width. 5. The charged particle beam apparatus according to claim 4,wherein the charged particle beam apparatus is a scanning electron microscope or a focused ion beam device.