US 12,070,942 B2
Inkjet printing apparatus, control method therefor, and storage medium
Taku Yokozawa, Kanagawa (JP); Kazuhiko Sato, Tokyo (JP); Noboru Kunimine, Tokyo (JP); Takeshi Murase, Kanagawa (JP); Hiroshi Taira, Tokyo (JP); Hiroshi Kawafuji, Tokyo (JP); Sae Mogi, Kanagawa (JP); and Akiko Aichi, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 27, 2021, as Appl. No. 17/512,243.
Claims priority of application No. 2020-181985 (JP), filed on Oct. 30, 2020.
Prior Publication US 2022/0134738 A1, May 5, 2022
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04563 (2013.01) [B41J 2/0458 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An inkjet printing apparatus comprising:
a print head configured to print an image on a printing medium using a printing element configured to eject ink with thermal energy;
a scanning unit configured to cause the print head to scan the printing medium in a direction that intersects with a direction in which the printing medium is conveyed; and
a control unit configured to control scanning by the scanning unit and image printing by the print head based on an image printing instruction,
wherein the control unit performs a control operation including:
executing, as part of a first scanning operation, a preliminary ejection process to eject, from the print head, ink that does not contribute to image printing, before performing an ink ejection process to print an image on the printing medium as part of the first scanning operation; and
determining an amount of ink to be ejected during the preliminary ejection process based on a difference between a target temperature and a scanning start temperature, the scanning start temperature being a temperature measured at the print head in response to an instruction to start the first scanning operation,
wherein the preliminary ejection process begins at a time when the measured scanning start temperature is lower than the target temperature.