Method of centering bond positions.

摘要

A method for increasing accuracy and reducing the time required to teach the target bonding points on a reference semiconductor device and its associated lead frame comprise manually approximately locating at least a first target bonding point and at each approximately located bonding point causing the pattern recognition system (PRS) of an automatic wire bonder to relocate the exact center of preferred target bonding point automatically. The direction and approximate distance to the next bonding point is programmed into the PRS to enable the PRS to automatically step to the next approximate location of a next bonding point or a pad or a lead. At each pad or lead the PRS is programmed to find or relocate this bonding point at the exact center or preferred target bonding point on the lead or pad. It is possible to program such automatic teach operations on pads or leads over a complete semiconductor or preferably over a plurality of pads or leads arranged in continuing direction and spaced from each other by a predetermined pitch. During bonding of production semiconductor devices the taught bonding points are employed as approximate bonding points which causes the PRS to again relocate the exact preferred target bonding points with reference to the PRS located edges of the pads and leads to be bonded.