Patent ID: 6395616
Filing Date: 2002-05-28
Classification: H01L,Y10T

Abstract:
A method for locally creating an aperture in a metal layer that is formed above a circular base wafer, the circular wafer having at least one lateral mark provided at a first point on the peripheral edge of the wafer and at least one surface mark provided at a point on the surface of the wafer, and the surface mark being located with respect to the peripheral edge of the circular wafer and the lateral mark, said method comprising the steps of:detecting the lateral mark and at least a second point on the peripheral edge of the circular wafer so as to set up a reference frame; finding coordinates of a starting position of a tool with respect to the peripheral edge of the circular wafer and the lateral mark; calculating coordinates of the position of the surface mark with respect to the starting position of the tool so as to determine a course to be followed by the tool from the starting position to a working position above the surface mark; moving the tool to the working position; and activating the tool so as to etch the metal layer and create the aperture in the metal layer above the surface mark.