A liquid ejection head includes a support member extending in a first direction, a print element board having an ejection port through which liquid is ejected, and first and second members arranged in the support member adjacent to each other along the first direction, each having a supply path extending in the first direction. The print element board element generates energy used for ejection of the supply paths supplied liquid. The first member includes an outlet port through which the supplied liquid flows out. The second member includes an inlet port through which the liquid from the outlet port flows. The outlet port is provided near a first member supply path end portion on the support member side on which the second member is provided. The inlet port is provided near a second member supply path end portion on the support member side on which the first member is provided.

A liquid discharge head substrate including a discharge opening through which a liquid is discharged, a base that includes a surface in which a heat generating element that generates heat to discharge the liquid through the discharge opening is provided, a first electrode that covers the heat generating element, a flow passage through which the liquid flows from a supply port that supplies the liquid, through the surface of the first electrode, and towards a collection port that collects the liquid, and a second electrode provided inside the flow passage, the second electrode together with the first electrode forming an electric field in the liquid, in which the second electrode is provided downstream of the first electrode in a flow direction of the liquid flowing towards the collection port from the supply port.

A liquid discharge head substrate including a discharge opening through which a liquid is discharged, a base that includes a surface in which a heat generating element that generates heat to discharge the liquid through the discharge opening is provided, a first electrode that covers the heat generating element, a flow passage through which the liquid flows from a supply port that supplies the liquid, through the surface of the first electrode, and towards a collection port that collects the liquid, and a second electrode provided inside the flow passage, the second electrode together with the first electrode forming an electric field in the liquid, in which the second electrode is provided downstream of the first electrode in a flow direction of the liquid flowing towards the collection port from the supply port.

A liquid ejection head includes a support member extending in a first direction, a print element board having an ejection port through which liquid is ejected, and first and second members arranged in the support member adjacent to each other along the first direction, each having a supply path extending in the first direction. The print element board element generates energy used for ejection of the supply paths supplied liquid. The first member includes an outlet port through which the supplied liquid flows out. The second member includes an inlet port through which the liquid from the outlet port flows. The outlet port is provided near a first member supply path end portion on the support member side on which the second member is provided. The inlet port is provided near a second member supply path end portion on the support member side on which the first member is provided.

A printhead includes a plurality of firing chambers, a plurality of fluid ejectors, and at least one field generating member. Each one of the firing chambers includes a nozzle region to receive printing fluid. The printing fluid includes an ink vehicle having pigments disposed therein. At least one field generating member generates a non-uniform electric field to apply forces to maintain respective pigments in the ink vehicle of the printing fluid in the nozzle region.

A printhead includes a plurality of firing chambers, a plurality of fluid ejectors, and at least one field generating member. Each one of the firing chambers includes a nozzle region to receive printing fluid. The printing fluid includes an ink vehicle having pigments disposed therein. At least one field generating member generates a non-uniform electric field to apply forces to maintain respective pigments in the ink vehicle of the printing fluid in the nozzle region.