Patent ID: 8474951

Claim:
A liquid ejection head comprising: a plurality of nozzles configured to eject liquid; a substrate including energy generating elements configured to generate energy for ejecting liquid from the nozzles; a first common liquid chamber and a second common liquid chamber which are formed along the substrate and into which liquid is introduced; a first nozzle array in which a plurality of nozzles are connected to the first common liquid chamber, the plurality of nozzles including short nozzles arranged a distance from the first common liquid chamber which is relatively short and long nozzles arranged a distance from the first common liquid chamber which is relatively long, which are alternately arranged on one side of the first common liquid chamber at a predetermined pitch P along the first common liquid chamber; a second nozzle array in which a plurality of nozzles are connected to the first common liquid chamber, the plurality of nozzles including short nozzles arranged a distance from the first common liquid chamber is relatively short and long nozzles arranged a distance from the first common liquid chamber which is relatively long, which are arranged on the other side opposite to the one side of the first common liquid chamber at the pitch P; a third nozzle array in which a plurality of nozzles are connected to the second common liquid chamber, the plurality of nozzles including short nozzles arranged a distance from the second common liquid chamber which is relatively short and long nozzles arranged a distance from the second common liquid chamber which is relatively long, which are alternately arranged on one side of the second common liquid chamber at the pitch P along the second common liquid chamber; and a fourth nozzle array in which a plurality of nozzles are connected to the second common liquid chamber, the plurality of nozzles including short nozzles arranged a distance from the second common liquid chamber which is relatively short and long nozzles arranged a distance from the second common liquid chamber which is relatively long, which are arranged on the other side of the second common liquid chamber at the pitch P, wherein the long nozzle and the short nozzle formed on the one side and the long nozzle and the short nozzle formed on the other side are disposed within a range of the pitch P in a direction in which the plurality of nozzles are arranged.