METHOD OF MODULATING THERMAL INK JET SPOT SIZE USING PARTIAL WIDTH ARRAY PRINTHEADS
Original Publication Date: 1997-Jun-30
Included in the Prior Art Database: 2004-Apr-08
Xerox Disclosure Journal
Disclosed is a method for modulating Thermal Ink Jet (TIJ) spot size using partial width array printheads comprising printing a document with sequential partial width array print heads situated around a drum wherein the heads contain the same ink composition but employ different sized channel plates or heaters to produce varying spot sizes depending on which sequential jets or combinations of jets are fired. In an exemplary configuration, two jets are assembled side by side on a common substrate that is oriented along the axis of the drum. Three of these arrays are positioned sequentially around the drum on a carriage that advances along the axis of the drum. The first array of dual printheads contains, for example, cyan ink in one printhead and black ink in the adjacent printhead. The next two arrays contain, respectively, magenta and yellow inks in one printhead each aligned with the cyan printhead. If all the partial width arrays contain dual printheads, two extra printheads would now be aligned with the black printhead. The same black ink is ported to, for example, three sequentially printing printheads, wherein each printhead contains a die with a different sized channel plate or heater to produce a different drop size. Printing combinations of the three heads can produce up to seven different spot sizes. The range of spot sizes could be further increased by varying the pulse width and or the voltage provided to the printheads.