US 12,077,001 B2
Liquid ejection apparatus and liquid ejection head
Kazuhiro Yamada, Kanagawa (JP); and Yohei Nakamura, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jan. 31, 2023, as Appl. No. 18/162,580.
Application 18/162,580 is a division of application No. 17/346,158, filed on Jun. 11, 2021, granted, now 11,597,212.
Claims priority of application No. 2020-106019 (JP), filed on Jun. 19, 2020.
Prior Publication US 2023/0173820 A1, Jun. 8, 2023
Int. Cl. B41J 2/175 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/17596 (2013.01) [B41J 2/14032 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A liquid ejection head configured to perform a reciprocal moving along a predetermined direction, comprising:
a liquid ejection unit including an ejection port capable of ejecting liquid;
a pressure control unit that receives the liquid from a liquid storing unit provided outside the liquid ejection head, and is capable of supplying the liquid whose pressure is controlled within a predetermined pressure range to the liquid ejection unit; and
a circulation unit configured to supply the liquid whose pressure is controlled by the pressure control unit to the ejection port while circulating the liquid between the liquid ejection unit and the pressure control unit;
wherein the pressure control unit includes,
a supply chamber configured to receive the liquid from the liquid storing unit;
a negative pressure chamber that communicates with the liquid ejection unit through the circulation unit; and
a pressure control valve configured to control a communication state between the supply chamber and the negative pressure chamber according to a pressure difference between the supply chamber and the negative pressure chamber,
wherein in a case where the pressure control valve is closed, a circulatory flow between the liquid ejection unit and the negative pressure chamber is separated from a flow between the liquid storing unit and the supply chamber.