Patent ID: 7909432

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; a plurality of liquid supply ports through which the liquid is supplied to the plurality of energy generating elements; a plurality of pressure chambers each communicating with a corresponding one of the plurality of ejection ports and including a corresponding one of the plurality of energy generating elements; a plurality of channels communicating with a corresponding one of the plurality of pressure chambers and formed symmetrically with respect to the ejection ports; and a plurality of liquid supply port arrays having the plurality of liquid supply ports formed at both sides of the ejection port array along the ejection port array, wherein the plurality of liquid supply port arrays is formed so as to correspond to a length of the ejection port array in a longitudinal direction of the ejection port array.