Patent ID: 6244691
Filing Date: 2001-06-12
Classification: B41J

Abstract:
An ink jet printing nozzle apparatus comprising:a wafer substrate having a nozzle chamber defined therein to be in fluid communication with an ink chamber so that ink to be ejected by said nozzle apparatus can be stored in the nozzle chamber, said wafer substrate also defining an outlet port opening into the nozzle chamber for the ejection of ink from said nozzle chamber;a magnet ic piston located over an ink inlet aperture in said nozzle chamber; andan activation coil located adjacent to said magnetic piston, said coil and said magnetic piston being configured so that, upon activation by a current set up in the coil, an electromagnetic force is applied to said piston that is sufficient to cause movement of said piston from a first position to a second position, said movement causing ink within said nozzle chamber to be ejected from said nozzle chamber through said outlet port onto print media.