Patent ID: 11938721
Assignee: CANON KABUSHIKI KAISHA
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A liquid ejection head comprising:
an ejection-port defining member defining ejection ports through which liquid is ejected in an ejection direction; and
a substrate supporting the ejection-port defining member,
the substrate having at least three liquid supply openings through which the liquid is supplied to the ejection ports, the liquid supply openings being arranged in an array direction and extending in an extending direction orthogonal to the array direction, when viewed in the ejection direction,
wherein at least one groove is disposed in a region of the substrate between ends of the liquid supply openings in the extending direction, and an edge of the substrate that intersects the extending direction when viewed in the ejection direction,
wherein the at least one groove extends from and is open to the end of at least one of two outermost liquid supply openings of the liquid supply openings in the array direction, and is disposed closer to a main surface of the substrate than a surface of the substrate supporting the ejection port defining member, and
wherein the at least one groove includes a portion which extends in the array direction at least to a position where, when viewed in the extending direction, the portion of the groove is superposed on the liquid supply opening next to the liquid supply opening from which the groove extends.