Patent ID: 6929168

Claim:
A method for determining optimum bond parameters for a bond force F B and an ultrasonic variable P and, optionally, at least one further bond parameter of a Wire Bonder for a bonding process, comprising the steps of: a) Carrying out several bonding operations, with which an end of a wire formed into a ball is bonded onto a connection point, whereby the bond force F B and the ultrasonic variable P and, if necessary, the at least one further bond parameter are each varied in discrete steps in a predefined range, whereby during bonding, for each bonding operation an electrical signal is produced by means of a sensor which signal is proportional to a shear force exerted on the corresponding connection point, b) for each bonding operation, determining a quantity G from the electrical signal delivered by the sensor during the bonding operation, c) Determining a maximum value of the quantity G and corresponding values for the bond force F B , the ultrasonic variable P and, if necessary, the at least one further bond parameter, or determining a global maximum of the quantity G and determining corresponding values for the bond force F B , the ultrasonic variable P and, if necessary, the at least one further bond parameter, or determining a range H for the quantity G in which the quantity G fulfills predefined criteria and determining a value for each of bond force F B , ultrasonic variable P and, if necessary, the at least one further bond parameter, which lie in the range H.