Liquid ejection substrate, liquid ejection head, and recording apparatus

A liquid ejection head comprising:

• a liquid ejection substrate having an internal liquid flow path including a nozzle, an individual channel communicating with the nozzle, and a common liquid chamber communicating with the individual channel, the liquid ejection substrate comprising:
• a nozzle forming member having a liquid ejection surface on which the nozzle opens;
• a first channel substrate including a first surface on which the nozzle forming member is provided, a second surface on an opposite side from the first surface, and a first wall portion forming a wall portion of the individual channel and the common liquid chamber;
• a second channel substrate including a third surface joined to the second surface of the first channel substrate in a first direction and a second wall portion forming a wall portion of the common liquid chamber;
• and
• a housing that supports the liquid ejection substrate,
• wherein the second wall portion includes a part where a cross section perpendicular to the first direction has a different sectional area from a sectional area of the first wall portion.

A recording apparatus comprising:

• a conveying portion configured to convey a recording medium;
• a liquid ejection head configured to eject a liquid toward a recording medium being conveyed by the conveying portion, the liquid ejection head comprising:
• a liquid ejection substrate having an internal liquid flow path including a nozzle, an individual channel communicating with the nozzle, and a common liquid chamber communicating with the individual channel, the liquid ejection substrate comprising:
• a nozzle forming member having a liquid ejection surface on which the nozzle opens;
• a first channel substrate including a first surface on which the nozzle forming member is provided, a second surface on an opposite side from the first surface, and a first wall portion forming a wall portion of the individual channel and the common liquid chamber;
• a second channel substrate including a third surface that is joined to the second surface of the first channel substrate in a first direction and a second wall portion forming a wall portion of the common liquid chamber;
• and
• a housing that supports the liquid ejection substrate,
• wherein the second wall portion includes a part where a cross section perpendicular to the first direction has a different sectional area from a sectional area of the first wall portion.