Patent ID: 7485879
Filing Date: 2009-02-03
Classification: B82Y,H01J

Abstract:
1. A writing apparatus comprising: a selector unit responsive to receipt of input data of a pattern to be written by shots of irradiation of an electron beam, configured to select a current density of the electron beam being shot and a maximal shot size thereof based on the input data of the pattern to be written; and a writing unit configured to create an electron beam with the current density selected by said selector unit, shape the created electron beam into a shot size less than or equal to said maximal shot size in units of the shots, and shoot the shaped electron beam onto a workpiece to thereby write said pattern, wherein said selector unit is configured to select the current density and the maximal shot size in such a way that, even upon input of different pattern data, a beam current value for shooting onto the workpiece the electron beam as shaped to have its size being less than or equal to the maximal shot size is less than or equal to a preset value.