Liquid ejection head and method for circulating liquid

A liquid ejection head, comprising:

• an ejection orifice forming member provided with an ejection orifice for ejecting a liquid;
• an energy-generating element for generating energy in order to eject the liquid;
• a substrate provided with the energy-generating element;
• a through-port penetrating the substrate;
• a linear liquid flow path connected to the ejection orifice and the through-port;
• and
• electrodes arranged in the liquid flow path, and for generating an electroosmotic flow in the liquid,
• wherein the electrodes include a first electrode and a second electrode, the first electrode and the second electrode extending in directions opposite each other from one end side and another end side, respectively, in a direction orthogonal to an extending direction of the liquid flow path, and
• wherein the electrodes are arranged on the ejection orifice forming member.

A liquid ejection head, comprising:

• an ejection orifice forming member provided with an ejection orifice array arraying a plurality of ejection orifices in order to eject a liquid;
• a plurality of energy-generating elements for generating energy in order to eject the liquid;
• a substrate provided with the plurality of energy-generating elements;
• a through-port array arraying a plurality of through-ports penetrating the substrate;
• a plurality of liquid flow paths positioned between the ejection orifice array and the through-port array, and connected to respective ejection orifices of the ejection orifice array and respective through-ports of the through-port array;
• electrodes arranged in each of the plurality of liquid flow paths for generating an electroosmotic flow in the liquid;
• and
• wirings connected to the electrodes, respectively, and passing through between adjacent through-ports in the through-port array,
• wherein the electrodes in each of the liquid flow paths include a first electrode and a second electrode, the first electrode and the second electrode extending in directions opposite each other from one end side and another end side, respectively, in a direction orthogonal to an extending direction of the liquid flow paths, and
• wherein the electrodes are arranged on the ejection orifice forming member.