Patent ID: 6467678
Filing Date: 2002-10-22
Classification: B23K,H01L

Abstract:
A wire bonding method in which a wire is bonded to a second bonding point, a capillary is raised by a specified amount, then a damper is closed, and said capillary and said damper are raised together so that said wire is cut from a root portion of said second bonding point, thus causing a tail of said wire used for forming a ball to extend from a lower end of said capillary, said method comprising the steps of:moving said capillary to a measurement position above a tail length measuring member after said tail has been extended, lowering said capillary so that a tip end of said tail contacts said tail length measuring member, then detecting a position of said capillary or a distance by which said capillary has been lowered, at a time that electrical continuity is established with said tail length measuring member, and calculating said tail length based upon: (a) a height level of said tail length measuring member, a position of said capillary prior to lowering of said capillary for measuring said tail, and a position of said capillary at a time that said wire contacts said tail length measuring member, or (b) a height of said capillary above said tail length measuring member prior to lowering of said capillary for measuring said tail, and a distance by which said capillary is lowered.