Patent ID: 7571985

Claim:
A liquid ejection head, comprising: a nozzle surface on which a plurality of nozzles are arranged; a diaphragm on which a plurality of piezoelectric elements are arranged; a plurality of pressure chambers which are defined between the nozzle surface and the diaphragm, each of the plurality of pressure chambers applying pressure to liquid which is ejected from a corresponding one of the plurality of nozzles; a common liquid chamber which is defined on a side of the diaphragm opposite to a side of the diaphragm on which the plurality of pressure chambers are defined, the common liquid chamber having an upper surface being a ceiling plate, the common liquid chamber communicating with each of the plurality of pressure chambers via a corresponding supply port, at least a portion of a surface of the common liquid chamber which contacts liquid being made as a thin layer; a gas chamber which contacts the common liquid chamber via the thin layer, and communicates with atmosphere; and a plurality of electrical wires which are formed in a direction substantially perpendicular to a surface of the diaphragm on which the piezoelectric elements are arranged, at least a portion of each of the electrical wires passing through the common liquid chamber and at least a portion of each of the electrical wires passing through the ceiling plate of the common liquid chamber.