Patent ID: 6417516
Filing Date: 2002-07-09
Classification: B82Y,H01J

Abstract:
A method for forming a desired pattern on a surface with an electron beam, the method comprising the steps of:projecting an electron beam through a first mask boundary area and onto a surface where a part of the desired pattern is to be formed, the first mask boundary area including a first mask portion of the desired pattern and a first accuracy evaluation element; projecting an electron beam through a second mask boundary area and onto the surface so that a projection of the electron beam through the second mask boundary area on the surface overlaps a projection of the electron beam through the first mask boundary area on the surface, the second mask boundary area having a second mask portion of the desired pattern and a second accuracy evaluation element, the overlapping projections of the electron beams through the first and second accuracy evaluation elements merging to form a complete accuracy evaluation pattern on the surface, the overlapping projections of the electron beams through the first and second mask portions of the desired pattern merging to form the part of the desired pattern on the surface when the first and second mask boundary areas are aligned; and measuring an alignment of the first and second mask boundary areas by measuring an alignment of the complete accuracy evaluation pattern on the surface.