Patent ID: 6234379
Filing Date: 2001-05-22
Classification: B23K,H01L

Abstract:
A method for filling a space between a flip chip and a substrate with no-flow flux and underfill material using a dispensing apparatus configured to dispense droplets of the no-flow flux and underfill material onto the substrate, the method comprising:spacing the dispensing apparatus away from the substrate so that the dispenser outlet does not contact the substrate;dispensing at least one droplet of no-flow flux and underfill material from the dispenser outlet onto the substrate;moving the dispensing apparatus relative to the substrate;forming a predetermined pattern of droplets on the substrate by repeating the dispensing and moving steps; andplacing a flip chip in contact with the pattern of droplets and the substrate to uniformly fill the space between the flip chip and the substrate with the no-flow flux and underfill material.