Patent ID: 7857410
Filing Date: 2010-12-28
Classification: B41J,G03G,G06F,G06K,H04N

Abstract:
1. A printer controller for an inkjet printer having a printhead with a plurality of nozzle arrangements, a paper transport mechanism, and an authentication integrated circuit, the controller comprising a data bus and purpose-specific functional units connected to the data bus, the controller being configured to execute software to control a dot size of ink discharged by the respective nozzles by performing the steps of: heating the ink in a nozzle by applying at least one firing pulse of a duration less than a duration required to discharge an ink dot; sensing the temperature of the heated ink in the nozzle; loading and updating a table having sensed values of temperature of ink in the nozzle, resistivity of an actuator heater of the nozzle and width of at least part of the actuator heater; and changing the duration of a firing pulse used to discharge an ink dot in response to the updated table of sensed temperature, resistivity and width values so as to produce a uniform ink dot size.