Patent ID: 6412895
Filing Date: 2002-07-02
Classification: B41J

Abstract:
An ink jet printer comprising a printing head including an ink chamber for receiving therein pigment ink, said ink chamber having an ink jet slit, and an array of ink jet electrodes, disposed in said ink chamber, for receiving an ejecting voltage to eject said pigment ink from said inkjet slit, and a head drive unit for receiving a set of recording data for said ejection electrodes during each recording clock cycle to generate a plurality of sets of first data during each recording clock cycle based on said set of recording data, each set of said first data including bit data for each of said ejection electrodes, a combination of said bit data for each of said ejection electrodes in each said recording clock cycle specifying an effective pulse width of said ejecting voltage for said each of said ejection electrodes, wherein said head drive unit includes a head control section for outputting a plurality of sets of serial data during each said recording clock cycle based on said set of recording data, and a shift register for serial/parallel conversion of said serial data into said first data and said head control section outputs a dummy data in each recording clock cycle to separate ink droplets ejected in adjacent recording clock cycles from each said ejection electrode.