Patent ID: 6448169
Filing Date: 2002-09-10
Classification: B23K,H05K,Y10T

Abstract:
A method of depositing solder ball connection to input-output (I/O) pad on a surface of a substrate, comprising the steps of:(a) depositing solder in a cavity of a depositor, wherein said depositor has a protrusion in said cavity, (b) mating said depositor to said substrate having said I/O pad such that said solder is in contact with said I/O pad, (c) flowing said solder such that a solder ball is formed between said I/O pad and said protrusion, and a contact surface is formed between said protrusion and said solder ball, (d) separating said depositor from said substrate a sufficient distance to separate said solder ball from said protrusion, wherein said depositor is separated from said substrate by a bias means urging said depositor and said substrate apart, and (e) reflowing said solder ball such that said contact surface becomes spherical.