US 12,296,584 B2
Liquid ejection head and liquid ejection apparatus
Koichi Ishida, Tokyo (JP); and Shuzo Iwanaga, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 29, 2022, as Appl. No. 17/877,501.
Claims priority of application No. 2021-126540 (JP), filed on Aug. 2, 2021.
Prior Publication US 2023/0039160 A1, Feb. 9, 2023
Int. Cl. B41J 2/045 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/04563 (2013.01) [B41J 2/04528 (2013.01); B41J 2/0458 (2013.01); B41J 2/14153 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A liquid ejection head comprising:
a print element substrate including an ejection port surface in which a plurality of ejection ports is arranged, and a plurality of temperature control units configured to control a temperature of the ejection port surface,
wherein the print element substrate is configured to eject a liquid from the plurality of ejection ports onto a medium and the liquid ejection head is configured to move the medium relatively to the liquid ejection head,
wherein the ejection port surface includes a region on a downstream side of the ejection port surface in a direction in which the medium relatively moves when the medium is viewed from the liquid ejection head, and includes a region on an upstream side of the ejection port surface in the relative moving direction,
wherein each of the plurality of temperature control units includes a temperature sensor configured to detect a value of the temperature of each of the downstream side region and the upstream side region, and includes a temperature control heater configured to heat each of the downstream side region and upstream side region, and
wherein each of the plurality of temperature control units is configured to control the temperature of the ejection port surface by activating each of the temperature control heaters based on the detected value of the downstream side region and the upstream side region by each of the temperature sensors so that a temperature of the downstream side region becomes higher than a temperature of the upstream side region.