Patent ID: 8308049

Claim:
A wire bonding method of applying vibrations to a tip portion of a copper wire while pressing the tip portion of the copper wire onto a bonding object to bond the tip portion of the copper wire to the bonding object, the method comprising: applying vibrations to the tip portion of the copper wire prior to a contact between the tip portion and the bonding object, and bringing the tip portion of the copper wire into contact with the bonding object while applying the vibrations; gradually increasing a pressing load of the tip portion of the copper wire on the bonding object to a first pressing load with a first output power of the vibrations greater than zero using a capillary; reducing the pressing load to a second pressing load smaller than the first pressing load and gradually increasing an output power of the vibrations from the first output power to a second output power after the pressing load reaches the first pressing load; and after bonding the tip portion of the copper wire to the bonding object, moving the capillary above another bonding object and bonding the copper wire to the other bonding object.