Patent ID: 7465039
Filing Date: 2008-12-16
Classification: B41J

Abstract:
1. A liquid ejection head, comprising: a plurality of ejection ports which eject liquid; a plurality of pressure chambers which are communicated with the ejection ports; a plurality of piezoelectric elements which are arranged to sides of the pressure chambers opposite sides of the pressure chambers where the ejection ports are formed, the piezoelectric elements each having driving electrodes, the piezoelectric elements each deforming the pressure chambers when drive signals are applied through the driving electrodes; a protective member which covers the piezoelectric elements and has a first wiring layer electrically connected to a first external wiring; a common liquid chamber which is arranged on the protective member on the sides of the plurality of pressure chambers opposite the sides of the pressure chambers where the ejection ports are formed, a wall of the common liquid chamber opposite the protective member having a second wiring layer electrically connected to a second external wiring, the common liquid chamber supplying the liquid to the plurality of pressure chambers; and a plurality of wiring members which are electrically connected to the second wiring layer and formed so that at least a part of each of the wiring members extends inside the common liquid chamber in a direction substantially perpendicular to a surface on which the piezoelectric elements are arranged, wherein a part of the driving electrodes of the piezoelectric elements are electrically connected to the first wiring layer, and another part of the driving electrodes of the piezoelectric elements are electrically connected to the second wiring layer through the wiring members.