Patent ID: 7845761
Filing Date: 2010-12-07
Classification: B41J

Abstract:
1. 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