Patent ID: 6890795

Claim:
A method to form an elongated solder bump, comprising: providing a first substrate and forming thereon a first solder bump; providing a second substrate and forming thereon a second solder bump; positioning said first and second solder bumps to be in positional and angular alignment relative to one another, said solder bumps being separated by a first distance and said substrates being separated by a second distance; heating both solder bumps till they melt; then reducing said first distance until the molten solder bumps merge into a single solder bump; while maintaining single solder bump in its molten state, increasing said second distance between substrates thereby lengthening said single solder bump and forming said elongated solder bump; terminating the step of increasing said second distance when said elongated solder bump achieves a desired aspect ratio then allowing it to solidify through cooling; and separating the elongated solder bump from said second substrate only.