Patent ID: 7524022

Claim:
A head module comprising: a plurality of head-chip lines, each head-chip line having a plurality of head chips arranged in a certain direction, each head chip having energy-generating elements for discharging liquid and electrodes for electrically connecting the energy-generating elements to a control substrate; and a wiring board having wires for electrically connecting the electrodes on the head chips to the control substrate, wherein the head module drives the energy-generating elements in the head chips through the wiring board to discharge liquid, wherein the wiring board includes connecting sections configured to connect the wires to the respective electrodes on the head chips in the respective head-chip lines, common wire sections configured to join some of the wires that are common to the head chips in the respective head-chip lines, and a terminal section configured to connect the wires to the control substrate at one side of the wiring board, wherein the wires in the connecting sections and the terminal section are arranged in a single-layer structure along a horizontal direction, and wherein the wires in the common wire sections are arranged in a multi-layer structure in which portions of the wires are stacked in the vertical direction.