Patent ID: 6488350
Filing Date: 2002-12-03
Classification: B41J

Abstract:
An ink jet printing apparatus for using a print head which has a plurality of electro-thermal transforming elements provided for one nozzle and generates a bubble by utilizing thermal energy caused by driving the plurality of electro-thermal transforming elements to eject an ink droplet and for performing printing onto a printing medium by ejecting the ink from the print head, said apparatus comprising:scanning means for scanning the print head relative to the printing medium at a predetermined scanning speed; and driving means for driving the plurality of electro-thermal transforming elements of the print head to eject ink from the nozzle while said scanning means scans the print head at the predetermined scanning speed, said driving means driving the plurality of electro-thermal transforming elements at different timings during scanning at the predetermined scanning speed to eject the ink droplet having a main drop section and a tailing section so as to form a dot more approximate a circular shape than that formed with the ink ejected by driving the plurality of electro-thermal transforming elements simultaneously during scanning at the predetermined scanning speed.