US Patent 11014356 Liquid ejection head, liquid ejection module, and liquid ejection apparatus

In a case where a direction of ejection of a second liquid is a direction from below to above, the second liquid flows above a first liquid in a pressure chamber. A substrate includes an outflow port located downstream of the pressure chamber in a direction of flow of the first liquid and configured to allow the first liquid to flow out of a liquid flow passage. A wall is located in the liquid flow passage and on a section of the substrate on a side opposite to the pressure chamber across the outflow port, the wall including a portion located higher than a surface of a section of the substrate where the pressure chamber is located on a side opposite to the wall across the outflow port.