Patent ID: 9168737
Filing Date: 2015-10-27
Classification: B41J

Abstract:
1. An inkjet printing system, comprising: an inkjet printhead comprising a plurality of inkjet nozzles; an ink reservoir connected to deliver ink to the inkjet printhead; a fire count detection system that detects a number of times the inkjet printhead has been activated to eject ink from one or more of the plurality of inkjet nozzles; an ink height calculation system that determines a height of ink remaining in the ink reservoir based on the fire count detected by the fire count detection system; a time period detection system that determines a period of time between a last inkjet printhead activation time and a current inkjet printhead activation time; an ink concentration calculation system that determines a pigment concentration of ink ejected by the inkjet printhead relative to an initial pigment concentration of the ink based on the determined height and the determined period of time; an activation controller configured to generate nozzle activation signals; and a control module operatively connected to receive information from the ink height calculation system, the time period detection system and the ink concentration calculation system and configured to determine based on the information a firing pattern for the inkjet printhead and to cause the activation controller to generate the nozzle activation signals based on the determined firing pattern.