Dispensing – Processes of dispensing – Molten metal
Patent
1997-01-02
1999-03-02
Kastler, Scott
Dispensing
Processes of dispensing
Molten metal
222594, 266237, B05B 108
Patent
active
058766154
ABSTRACT:
A simple yet highly reliable technique for ejecting a droplet of heated solder, or other liquid conductive material, is described. Small droplets of an electrically-conductive liquid are ejected on-demand from a drop generator operating on a magnetohydrodynamic principle. The drop generator consists of two substantially parallel conductive paths separated by a thin electrically-insulating material. A channel for the conductive liquid contains a drop ejecting orifice, and the conductive liquid in the channel forms a first of these two parallel conductive paths. The other path is either a solid conductor or a second channel filled with the conductive liquid. A current on the order of 10-1000 amperes is pulsed through the two parallel conductive paths, and the interaction of the magnetic fields generated by the electric currents through the parallel paths with these currents forces a droplet of the conductive liquid through the orifice in the first channel. By adjusting the duration and/or magnitude of the pulsed current, the droplet size may be carefully controlled. In the preferred embodiment, the drop generator is in the form of a self-contained replaceable cartridge.
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Hewlett--Packard Company
Kastler Scott
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