US 12,172,450 B2
Inkjet printing apparatus and inkjet printing method
Takuya Fukasawa, Yokohama (JP); Yuhei Oikawa, Yokohama (JP); Takatoshi Nakano, Yokohama (JP); Yoshinori Nakagawa, Kawasaki (JP); and Atsushi Takahashi, Tama (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jan. 29, 2024, as Appl. No. 18/426,043.
Application 18/426,043 is a continuation of application No. 17/471,946, filed on Sep. 10, 2021, granted, now 11,919,318.
Application 17/471,946 is a continuation of application No. 16/571,579, filed on Sep. 16, 2019, granted, now 11,141,990, issued on Oct. 12, 2021.
Claims priority of application No. 2018-190490 (JP), filed on Oct. 5, 2018.
Prior Publication US 2024/0165960 A1, May 23, 2024
Int. Cl. B41J 2/18 (2006.01); B41J 2/045 (2006.01)
CPC B41J 2/18 (2013.01) [B41J 2/04563 (2013.01); B41J 2/0458 (2013.01)] 49 Claims
OG exemplary drawing
 
1. An inkjet printing apparatus comprising:
a print head comprising at least one ejection opening for ejecting ink, a printing element for generating energy used for ejecting ink corresponding to the ejection opening, and a pressure chamber which is an area facing to the printing element, the ejection opening ejecting ink supplied in the pressure chamber, wherein no driving source for flowing ink is in the print head;
a decision unit configured to perform a decision operation for deciding an ink ejection state of the ejection opening;
a circulation unit provided outside of the print head and configured to perform a circulation operation in which ink is circulated from the outside of the pressure chamber to the inside of the pressure chamber and from the inside of the pressure chamber to the outside of the pressure chamber by supplying ink such that the ink flows from a first flow path for supplying ink to the pressure chamber of the print head to a second flow path, and further configured to circulate ink so that ink which has flowed through the second flow path flows through the first flow path again, the second flow path being communicated with the pressure chamber and different from the ejection opening and the first flow path; and
a control unit configured to cause the circulation unit to perform the circulation operation and the decision unit to perform the decision operation at least partially in parallel with the circulation operation.