US 12,434,484 B2
Liquid ejection head
Kazuya Yoshii, Kanagawa (JP); Soji Kondo, Kanagawa (JP); Naozumi Nabeshima, Tokyo (JP); and Keiichiro Tsukuda, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 15, 2023, as Appl. No. 18/317,765.
Claims priority of application No. 2022-081616 (JP), filed on May 18, 2022; and application No. 2023-041894 (JP), filed on Mar. 16, 2023.
Prior Publication US 2023/0373221 A1, Nov. 23, 2023
Int. Cl. B41J 2/175 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/17596 (2013.01) [B41J 2/14 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A liquid ejection head comprising:
an ejection module including a pressure chamber and an ejection element configured to generate a pressure for ejecting a liquid in the pressure chamber;
a supply channel connected to the pressure chamber and through which the liquid is supplied to the pressure chamber;
a collection channel connected to the pressure chamber and through which the liquid is collected from the pressure chamber;
a first pressure adjustment unit having:
a first pressure control chamber connected to the supply channel,
a first valve chamber connected to the first pressure control chamber through a first opening, and
a first valve configured to open and close the first opening; and
a second pressure adjustment unit having:
a second pressure control chamber connected to the collection channel,
a second valve chamber connected to the second pressure control chamber through a second opening, and
a second valve configured to open and close the second opening;
wherein the first pressure control chamber has
a first flexible member provided at a surface opposite to the first opening,
a first pressing plate configured to be displaced in conjunction with the first flexible member, and
a first biasing member configured to bias the first pressing plate in a direction in which a volume of the first pressure control chamber increases,
wherein the first pressure control chamber is configured to open and close the first opening with the first valve according to displacement of the first pressing plate and the first flexible member,
wherein the second pressure control chamber has
a second flexible member provided at a surface opposite to the second opening,
a second pressing plate configured to be displaced in conjunction with the second flexible member, and
a second biasing member configured to bias the second pressing plate in a direction in which a volume of the second pressure control chamber increases,
wherein the second pressure control chamber is configured to open and close the second opening with the second valve according to displacement of the second pressing plate and the second flexible member,
wherein a controlled pressure in the first pressure adjustment unit is set higher than a controlled pressure in the second pressure adjustment unit,
wherein a second pressure reception area of the second flexible member and the second pressing plate in the second pressure control chamber in a case where the second opening is brought into an open state by the second valve is smaller than a first pressure reception area of the first flexible member and the first pressing plate in the first pressure control chamber in a case where the first opening is brought into an open state by the first valve, and
wherein the first pressure reception area is an area of portions of the first flexible member and the first pressing plate that receive a force generated by a pressure difference between atmosphere outside the first pressure control chamber and a pressure in the first pressure control chamber and the second pressure reception area is an area of portions of the second flexible member and the second pressing plate that receive a force generated by a pressure difference between atmosphere outside the second pressure control chamber and a pressure in the second pressure control chamber.