US 12,391,051 B2
Liquid ejection head and liquid ejection apparatus
Soji Kondo, Kanagawa (JP); Naozumi Nabeshima, Tokyo (JP); and Kazuya Yoshii, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 13, 2022, as Appl. No. 18/079,937.
Claims priority of application No. 2021-205412 (JP), filed on Dec. 17, 2021.
Prior Publication US 2023/0191795 A1, Jun. 22, 2023
Int. Cl. B41J 2/175 (2006.01); B41J 2/14 (2006.01); B41J 2/185 (2006.01)
CPC B41J 2/17596 (2013.01) [B41J 2/14201 (2013.01); B41J 2/17563 (2013.01); B41J 2/185 (2013.01); B41J 2002/14403 (2013.01); B41J 2002/14467 (2013.01); B41J 2002/14491 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A liquid ejection head comprising:
an ejection port from which a liquid is ejected;
a pressure chamber communicating with the ejection port;
an ejection element configured to generate ejection energy for ejecting the liquid supplied to the pressure chamber; and
a circulation path through which the liquid is circulated,
wherein the circulation path comprises:
a supply channel through which the liquid is supplied to the pressure chamber;
a collection channel through which the liquid is collected from the pressure chamber;
a circulation pump which supplies the liquid collected through the collection channel to the supply channel; and
a pressure adjustment unit configured to adjust a pressure of the liquid supplied to the supply channel,
wherein a pressure P21 of the liquid supplied to the pressure chamber from the pressure adjustment unit through the supply channel in a state in which the circulation pump is stopped, a pressure P22 of the liquid supplied to the pressure chamber from the pressure adjustment unit through the supply channel in a state in which the circulation pump is driven, and a pressure loss ΔP from the pressure adjustment unit to the pressure chamber in the state in which the circulation pump is driven have relationships of:
P22>P21 and P22−ΔP<0,
wherein the pressure adjustment unit comprises a first pressure adjustment unit connected between the supply channel and an inlet through which the liquid supplied from a liquid supply source is introduced,
wherein the first pressure adjustment unit has a first liquid chamber which stores the liquid supplied from the liquid supply source and the circulation pump, and a first adjustment mechanism which adjusts a pressure of the liquid supplied to the supply channel from the first liquid chamber,
wherein the pressure adjustment unit further comprises a second pressure adjustment unit fluidly connected to the first liquid chamber, the collection channel, and the circulation pump, and
wherein the second pressure adjustment unit has a second liquid chamber which stores the liquid supplied from the first liquid chamber and the collection channel, and a second adjustment mechanism which adjusts a pressure of the liquid supplied to the second liquid chamber.