Patent ID: 7938501

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 first print element column and a second print element column, each composed of an array of print elements adapted to eject ink by applying a voltage pulse to a heater, the ink jet printing apparatus comprising: means for acquiring for individual print element columns heat amount information representing the amount of heat transferred from the heater 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 the individual 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 first print element column and the second print element column 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 a pulse based on a table having 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 first temperature region and a second temperature region, and wherein the voltage value is constant in the first temperature region and differs depending on the ink temperature in the second temperature region.