Patent ID: 8148698

Claim:
A charged particle beam writing apparatus comprising a stage on which a workpiece is mounted and beam irradiating unit configured to irradiate with a charged particle beam, said charged particle beam writing apparatus being adapted to write a predetermined pattern on said workpiece mounted on said stage by irradiating said workpiece with said charged particle beam from said beam irradiating unit, wherein said beam irradiating unit includes a blanking deflector for selectively allowing or preventing said irradiation of said workpiece with said charged particle beam, a shaping deflector for shaping the cross section of said charged particle beam into a predetermined shape, and a main deflector and a sub-deflector for scanning said charged particle beam over said workpiece, wherein said blanking deflector includes a rod-like inner electrode and a outer electrode enclosing said inner electrode such that an air gap through which said charged particle beam passes is formed between said inner and outer electrodes, and wherein each of said inner and outer electrodes is formed by forming an electrode film of a metal over the surface of a nonconducting base material by vacuum deposition or sputtering.