Patent ID: 8083318

Claim:
A liquid ejection head comprising: an orifice plate comprising an arrangement of an ejection port array having a plurality of ejection ports through which a liquid is ejected; a substrate comprising a plurality of energy generating elements arranged so as to correspond to the plurality of ejection ports and generating energy utilized to eject the liquid; common supply ports penetrating the substrate, formed at both sides of the ejection port array, and supplying the liquid to the plurality of energy generating elements; a plurality of pressure chambers each communicating with one of the plurality of ejection ports and including one of the plurality of energy generating elements; and a plurality of channels in communication with the common supply ports and the plurality of pressure chambers, the plurality of channels being formed at both sides of each of the pressure chambers, the liquid being supplied to each of the pressure chambers from both sides of the pressure chambers, wherein the supply ports are formed so as to correspond to a length of the ejection port array in a longitudinal direction of the ejection port array.