Patent ID: 7621622

Claim:
A liquid ejection head, comprising: a plurality of pressure chambers which are provided correspondingly to a plurality of ejection holes formed on a first wall defining the pressure chambers, the ejection holes being two-dimensionally arranged and ejecting liquid toward a liquid receiving medium, the pressure chambers accommodating the liquid to be ejected from the ejection holes; a common liquid chamber which supplies the liquid to the pressure chambers; a plurality of piezoelectric elements which are provided correspondingly to the pressure chambers and are arranged on a second wall defining the pressure chambers opposing the first wall, the piezoelectric elements each having individual electrodes to which drive signals are applied; a plurality of extending electrodes which extend from the individual electrodes of the piezoelectric elements and we electrically connected to the individual electrodes; a structural member which is bonded to a first surface of the second wall reverse to a second surface thereof adjacent to the pressure chambers, the structural member having a laminated structure in which at least two members we arranged to overlap each other, the at least two members including an outermost member having a surface in contact with atmosphere and serving as a heat radiating member, the at least two members including at least one member serving as a heat insulating member; a drive circuit which is installed on the outermost member of the structural member, the drive circuit generating the drive signals to be applied to the piezoelectric elements; and a plurality of conducting members which electrically connect the extending electrodes and the drive circuit, the conducting members having vertical conducting portions which are formed in a direction substantially vertical to a plane on which the piezoelectric elements are arranged, and horizontal conducting portions which are formed in a direction substantially perpendicular to the vertical conducting portions, the vertical conducting portions being contained in the structural member and each of the horizontal conducting portions being formed on a surface of at least one of the heat radiating member and the heat insulating member in plan view and intersecting with the vertical conducting portions.