Patent ID: 6443350
Filing Date: 2002-09-03
Classification: B22F,B23K,B41J,G01N,H01L,H05K

Abstract:
A liquid solder jet apparatus for depositing a stream of liquid solder droplets on at least one bond pad of selected bond pads of at least one semiconductor die of a substrate having a surface having a plurality of locations thereon extending throughout said surface, each location of said plurality of locations on said surface having a start point and an endpoint, comprising:a continuous stream generator for producing a stream of liquid metal solder droplets, the liquid metal solder droplets having a uniform size within a consistent predetermined range; and a stream director for selectively directing said stream of liquid metal solder droplets after being produced by said continuous stream generator onto said at least one bond pad of said at least one semiconductor die of said substrate, said stream director comprising a raster scanner scanning said stream of liquid metal solder droplets, said raster scanner including: an electrical charge generator for charging at least a portion of said liquid metal solder droplets of said stream of liquid metal solder droplets with an electrical charge; a stream blanking device for intermittently blanking at least some of said liquid metal solder droplets of said stream of liquid metal solder droplets; and an electrically charged droplet deflector for deflecting at least one electrically charged liquid metal solder droplet of said stream of liquid metal solder droplets in a first direction and a second direction for deposition at a location of said plurality of locations extending throughout said surface of said substrate when said substrate remains stationary.