Patent ID: 6145948
Filing Date: 2000-11-14
Classification: B41J

Abstract:
An ink jet head comprising:a plurality of groups of a plurality of electrothermal transducers for producing thermal energy contributable to ejection of an ink;storing means for storing image data for said electrothermal transducers;selecting means for sequentially selecting groups from said groups of electrothermal transducers;supply means for supplying a first drive signal or a second drive signal for the electrothermal transducers in the group selected by said selecting means in accordance with the image data stored in said storing means;wherein the first drive signal comprises a first heat signal for preliminary ink heating and a second heat signal for ejecting the ink, and said second drive signal has the first heat signal and not the second heat signal;wherein said supply means, during a recording operation, supplies the first heat signal to all of the thermal transducers in the selected group at a same timing irrespective of whether said second heat signal for ejecting the ink is supplied thereto.