Patent ID: 6541364
Filing Date: 2003-04-01
Classification: B23K,H01L,H05K

Abstract:
A bump forming method of forming bumps on electrode portions of a semiconductor wafer or an electronic circuit board using conductive particles, the method comprising:a process of positioning a mask having through holes for the conductive particles at bump forming positions to the wafer or the circuit board, and putting the mask and the wafer or the circuit board on a table having suction holes formed thereon; a particle mounting process of moving a conductive particle supply means while the conductive particles are being dropped on the mask, and sucking the conductive particles through the holes formed on the table via the through holes formed in the mask in synchronism with a moving position of the conductive particle supply means, and mounting the conductive particles onto the electrode portions of the semiconductor wafer or the electronic circuit board; and a ball collecting process of collecting the conductive particles not dropped into the through holes of the mask.