Patent ID: 7845761

Claim:
An ink jet printing apparatus that performs printing by using a print head provided with ejection openings for ejecting inks and heaters to which pulses are applied for generating thermal energy to eject ink, said apparatus comprising: a print head control unit that drives the print head by applying pulses to the heaters to generate thermal energy to eject ink; and a processing unit that controls said print head control unit to eject the ink from the print head in a recovery operation for the print head other than a printing operation, the recovery operation being a preliminary ejection, wherein the print head includes a first ejection opening and a second ejection opening, and a distance from an ink supply port, common to the first and second ejection openings, to the second ejection opening is greater than a distance from the ink supply port to the first ejection opening, and said processing unit controls said print head control unit to apply the pulses which meet a condition that a ratio (E 2 /Eth 2 ) is greater than a ratio (E 1 /Eth 1 ) in which Eth 1 and Eth 2 are lower limit energies supplied to the heaters and required for ink ejection through the first and the second ejection openings, respectively, and E 1 and E 2 are energies supplied to the heaters for ink ejection through the first and the second ejection openings, respectively, and to apply a respective predetermined number of the pulses to the heaters for ink ejection through the first and second ejection openings, in the preliminary ejection controlled by said processing unit.