Method for inspecting settling time of deflection amplifier,...

Radiant energy – With charged particle beam deflection or focussing – Magnetic lens

Reexamination Certificate

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C250S3960ML, C250S397000, C250S398000, C250S492220, C250S491100, C341S120000, C341S141000

Reexamination Certificate

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07989777

ABSTRACT:
A method for inspecting a settling time of a deflection amplifier includes setting a settling time, performing shooting a plurality of times alternately to project two patterns of different types which are shaped by making a charged particle beam pass through a first and a second apertures while deflecting the charged particle beam by a deflector controlled by an output of a deflection amplifier which is driven based on the settling time having been set, measuring beam currents of the shooting, calculating an integral current of the beam currents measured, and calculating a difference between the integral current calculated and a reference integral current to output the difference.

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Office Action issued Feb. 14. 2011, in Korean Patent Application No. 10-2009-37900, (w/English translation), pp. 1-7.

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