Patent ID: 7686413

Claim:
An ink jet printing apparatus to form an image on a print medium by using a print head, wherein the print head has a plurality of print element columns, each formed of an array of print elements each adapted to eject ink by applying a voltage pulse to a heater, the ink jet printing apparatus comprising: means for acquiring for each of the plurality of print element columns heat amount information representing the amount of heat transferred from the heaters to the ink in unit time; means for acquiring an ink temperature of the print element columns; and selection means for selecting a pulse for each of the plurality of print element columns based on the heat amount information and the ink temperature, wherein the selection means selects pulses of equal voltage values for the individual print element columns irrespective of the heat amount information, whatever value the ink temperature may be, and the voltage values of the selected pulses are based on the ink temperature, wherein the selection means selects the pulse based on a table having a plurality of items of pulse information including a voltage value and a pulse width and also on the heat amount information and the ink temperature, wherein the table has a plurality of temperature regions, each having pulse information corresponding to the heat amount information, and wherein the pulse width included in each item of pulse information of the table is based on a voltage value of the largest of the plurality of items of heat amount information in each temperature region and differs depending on the heat amount information.