Patent ID: 7681995

Claim:
A liquid ejection head for ejecting droplets of a solution, in which charged particles are dispersed, by exerting electrostatic forces on the solution, comprising: an insulating ejection substrate in which through holes are bored to form ejection openings for ejecting the droplets; an insulating support substrate arranged while facing said ejection substrate with a predetermined distance therebetween; a solution flow path formed by said ejection substrate, said support substrate and first and second insulating flow path sidewalls provided between said ejection substrate and said support substrate; ejection electrodes provided on the insulating ejection substrate, respectively around the through holes, for exerting the electrostatic forces on the solution; and a shield electrode provided on the insulating ejection substrate, corresponding to at least one of the through holes on a solution ejection side with respect to said ejection electrodes, for preventing electric field interferences between the through holes, wherein insulating flow path wall portions, each of which is joined to said ejection substrate and said support substrate and is different from the first and second flow path sidewalls, are formed in a central part of said solution flow path at the positions of the through holes, and are located within said flow path so that all sidewalls of each of said flow path wall portions are in contact with the solution flowing through the inside of said solution flow path, and at least one of electrode lines connected to said ejection electrodes and electrode lines connected to said shield electrode are included in the inside of the flow path wall portions.