Patent ID: 6059168
Filing Date: 2000-05-09
Classification: B23K,H01L

Abstract:
A wire bonding apparatus for performing a wire bond operation on a workpiece having a planar upper surface, wherein said apparatus comprises:wire bonding means for forming a wire bond, said wire bonding means having a home position;a drive unit for positioning the wire bonding means; anda controller for controlling the drive means and the wire bonding means, wherein said controller comprises:equation generating means for generating an equation that defines the geometric plane of the upper surface of the workpiece;height determining means for determining, based on said equation, a difference in height between the home position of said wire bonding means and said workpiece at a selected bonding position;means for determining a speed profile of said wire bonding means according to said difference in height;height controlling means for controlling the height of said wire bonding means, wherein said height controlling means provides control signals to said drive unit to sequentially move said wire bonding means through said speed profile such that said wire bonding means is moved to said bonding position with a desired motion; andmeans for generating a bond control signal and for providing the bond control signal to said wire bonding means such that said wire bonding means performs the wire bonding operation when said wire bonding means reaches the bonding position.