Patent ID: 6234623
Filing Date: 2001-05-22
Classification: B41J

Abstract:
An ink jet printhead comprising:first and second substrates;one surface of the first substrate containing an internal ink chamber recess defined by a chamber wall and a plurality of passageway recesses formed perpendicularly through the chamber wall to provide a first filter portion array of a predetermined pore size;a fill hole provided through the first substrate, one end of the fill hole entering the internal ink chamber recess;one surface of the second substrate containing a linear array of heating elements having addressing electrodes; andthe one surface of the first substrate being aligned with and bonded to the one surface of the second substrate with an insulating layer provided therebetween,wherein a linear array of parallel channel recesses are formed between the one surface of the first substrate and the one surface of the second substrate, each channel recess opening on one end to form an ink nozzle and having one of the heating elements spaced thereon a predetermined distance from the channel open end, the insulating layer including an array of apertures formed therein and extending substantially parallel to and opposed to the plurality of passageway recesses to provide a second filter portion array of a predetermined pore size, ink traveling from the fill hole to the ink nozzles through the internal ink chamber, through one of the first and second filter portions and into the linear array of parallel channel recesses.