Patent ID: 6034376
Filing Date: 2000-03-07
Classification: B82Y,H01J

Abstract:
An electron-beam exposure system having an electron-beam mask including a plurality of cell patterns used for cell projection lithography, said electron-beam exposure system comprising:a beam current adjustment filter having a certain number of electron-beam absorbent membranes to be positioned in a path of an electron-beam projected through one of the plurality of cell patterns and irradiated on an object material,wherein, each of said electron-beam absorbent membranes comprises a solid material layer, spanning from a first side of an aperture through which the electron beam is projected to a second side of said aperture to cover an open area of said aperture in its entirety; beam absorption coefficients of the electron-beam absorbent membranes being prepared to give a substantially fixed current intensity of the electron-beam irradiated on the object material for each of the plurality of cell patterns by considering open space of each of the plurality of cell patterns.