Patent ID: 6959973

Claim:
An ink jet printing apparatus capable of mounting a printing head having a plurality of ink discharging ports for discharging ink, electrothermal energy converting elements provided corresponding to each of said plurality of ink discharging ports, said electrothermal energy converting elements capable of being energized by an energization means and then generating a bubble in the ink to discharge ink; said energization means comprising: a single driving power source serving as a source of supplying an electrical energy; and a control unit for controlling the electrical energy supplied from said driving power source; wherein said control unit performs a control for supplying said electrothermal energy converting elements with said electrical energy that generates said bubble to the extent that ink droplets are discharged from the ink discharge ports, if the electrothermal energy converting elements are driven to accomplish printing; wherein said control unit performs a control for supplying said electrothermal energy converting elements with said electrical energy that generates said bubble to the extent that ink droplets are not discharged from the ink discharge ports; wherein said controls are selectively performed; and wherein said control unit has voltage generating means for generating at least two types of voltage such as a high voltage and a low voltage, the voltage generating means applying a relatively low voltage to said electrothermal energy converting elements when generating said bubble to the extent that ink droplets are not discharged from the ink discharging ports.