US 12,285,955 B2
Liquid ejection head and liquid ejection apparatus
Kyosuke Toda, Kanagawa (JP); Chiaki Muraoka, Saitama (JP); Takeho Miyashita, Kanagawa (JP); Shimpei Yoshikawa, Kanagawa (JP); and Yasuaki Kitayama, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 17, 2023, as Appl. No. 18/198,502.
Claims priority of application No. 2022-081586 (JP), filed on May 18, 2022.
Prior Publication US 2023/0373223 A1, Nov. 23, 2023
Int. Cl. B41J 2/19 (2006.01); B41J 2/175 (2006.01)
CPC B41J 2/19 (2013.01) [B41J 2/17596 (2013.01); B41J 2202/12 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A liquid ejection head comprising:
a printing element substrate having a pressure chamber in which ejection ports are formed and for ejecting liquid from the ejection ports;
a first supply flow path provided on the printing element substrate and communicating with the pressure chamber;
a first collection flow path provided on the printing element substrate and communicating with the pressure chamber;
a circulation pump causing a pressure difference to occur between the first supply flow path and the first collection flow path so that liquid is supplied from the first supply flow path to the pressure chamber and liquid of the pressure chamber is collected from the first collection flow path; and
a second supply flow path connecting the first supply flow path and the circulation pump, wherein
the second supply flow path has a vertical cross-sectional area in a liquid circulation direction, which is double or more a vertical cross-sectional area in a liquid circulation direction in the first supply flow path and has a flow path inner wall inclined with respect to the gravitational direction and whose component force of a normal vector has a component in the gravitational direction.