Patent ID: 7699424
Filing Date: 2010-04-20
Classification: B41J

Abstract:
1. An inkjet printing apparatus having a printhead equipped with printing element row that includes printing elements having a plurality of heat-producing resistance elements, comprising: a temperature sensing unit, which is provided at least on both sides of the printing element row in the array direction thereof and senses the temperature of the printhead; a temperature distribution storage unit in which a temperature distribution along the printing element row assumed when printing has been performed by driving the printing elements has been stored in advance; a temperature gradient calculating unit which calculates the temperature gradient of the printing element row from the temperature of the printhead sensed by said temperature sensing units; a predicting unit which predicts the temperature of each printing element using the temperature gradient calculated by said temperature gradient calculating unit and the temperature distribution along the printing element row stored in said temperature distribution storage unit in advance; and a control unit which applies discharge pulses, which are decided based upon the predicted temperature from said predicting unit, to each of the printing elements.