Patent ID: 7918544

Claim:
An inkjet head comprising: a head chip comprising: a plurality of rows of channels arranged in parallel to each other, wherein each row of the plurality of rows of channels comprises a plurality of channels arranged in parallel to each other, and each of the plurality of channels is provided with an opening on a front surface of the head chip, from which side ink is ejected from the head chip, and an opening on a back surface of the head chip opposite to the front surface; a plurality of driving walls each made of piezoelectric member, wherein each of the plurality of driving walls and each of the plurality of channels are provided alternately; and a plurality of drive electrodes provided in each of the plurality of channels; wherein, when assuming that one of the plurality of rows of channels provided on a side of an end of the head chip is row A and another of the plurality of rows of channels provided next to row A is row B, on the back surface of the head chip, a plurality of interconnection electrodes for row A that conduct electrically to the plurality of drive electrodes are formed extending from each of the plurality of channels of row A to the end of the head chip and a plurality of interconnection electrodes for row B that conduct electrically to the plurality of drive electrodes are formed extending from each of the plurality of channels of row B to short of the row A; a nozzle plate comprising a plurality of nozzles; a multi layer member comprising: an insulating layer; a lead wiring for row A provided on one surface of the insulating layer; and a lead wiring for row B provided on the other surface of the insulating layer; wherein the one surface of the insulating layer faces the back surface of the head chip, the lead wiring for row A is connected so as to conduct electrically to one of the plurality of interconnection electrodes for row A and the lead wiring for row B is connected so as to conduct electrically to the one of the plurality of interconnection electrodes for row B; wherein an end portion of the multilayer member protrudes beyond the end of the head chip on the row A side of the head chip; and wherein, at an end portion of the multilayer member, the lead wiring for row B extends beyond an end portion of the insulating layer over the lead wiring for row A outward; and a plurality of drive interconnections for applying drive signals from a drive circuit to the lead wiring for row A and the lead wiring for row B from a side of a surface of joining the multilayer member with the head chip.