Patent ID: 6525328
Filing Date: 2003-02-25
Classification: B82Y,H01J

Abstract:
An electron beam lithography system having an electron optical system comprising:an electron beam emitting device for emitting an electron beam to a substrate on which a desired pattern is to be written, said electron beam emitting device having a cathode for emitting electrons, said electron beam having a cross section, which is asymmetric with respect to an optical axis, and, said cathode emitting at an acceleration voltage at which the quantity of back scattered electrons generated from said substrate by irradiation with said electron beam is lower than a quantity at which the light exposure of a close pattern to be written is affected; a character aperture including a hole having a shape corresponding to the shape of said desired pattern; an illumination optical system for controlling the emitted electron beam so as to irradiate said character aperture with the electron beam, said illumination optical system being set with demagnifications which are different in X-axis and Y-axis directions to each other when the direction of said optical axis is Z-axis direction so that said character aperture is irradiated with said electron beam which includes a cross section having a first aspect ratio of about 1, said electron beam being shaped so as to correspond to the shape of said shaping aperture, and a projection optical system for demagnifying said electron beam and for forming an image on said substrate, said projection optical system demagnifying said electron beam at the same demagnification in X-axis and Y-axis directions to each other and forming the image on said substrate through a trajectory which is asymmetric with respect to said Z-axis at different incident angles in said X-axis and Y-axis directions to each other.