Patent ID: 8083325

Claim:
A liquid ejection recording head comprising: an element substrate provided with a plurality of ejection energy generating elements for generating energy for ejecting liquid; an ejection outlet array comprising a plurality of ejection outlets for ejecting the liquid; and bubble generation chambers for generating bubbles by the ejection energy generating elements, wherein said element substrate comprises a first liquid supply port provided, by being penetrating through said element substrate, along an arrangement direction of the ejection outlets and comprises a plurality of second liquid supply ports disposed between a lateral end of said element substrate and said bubble generation chambers, wherein each of said bubble generation chambers communicates with the first liquid supply port through a first liquid supply passage and communicates with the second liquid supply ports through a second liquid supply passage, wherein said element substrate has a thermal resistance against heat flowing from the ejection energy generating elements along a direction which is perpendicular to an ejection outlet array direction and which is parallel to a surface of said element substrate on which the ejection energy generating elements are formed, wherein the thermal resistance, per unit length with respect to the ejection outlet array direction, at both end portions of said ejection outlet array is greater than that at a central portion of said ejection outlet array, and wherein the first liquid supply port is divided into a plurality of liquid supply port portions by a bridging portion along the ejection outlet array direction.