Patent ID: 7401637

Claim:
An apparatus for dispensing a molten solder into cavities of a substrate, comprising: a micro-hole feed solder head having a micro-hole feed plate at the bottom of said solder head containing an array of small holes through which solder is supplied under pressure into cavities in a substrate; a solder reservoir connected to said micro-hole feed solder head for holding said solder, wherein said micro-holes have a diameter from about 10 microns to about 100 microns and an aspect ratio of at least about 2; means for heating said reservoir for maintaining said solder in a molten state; and means for supplying said solder from said reservoir to said micro-hole feed plate through a manifold structure in said micro-hole solder head; and means for supplying a gas at pressure to said solder head such that when said gas pressure is applied, the molten solder in said reservoir is pushed towards the micro-hole feed plate at the bottom of said solder head through said manifold structure thereby dispensing molten solder into cavities of said substrate.