Patent ID: 7905581

Claim:
An inkjet head comprising: a nozzle plate comprising a plurality of nozzles; 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 a plurality of driving walls each made of piezoelectric member, wherein each of the plurality of channels and each of the plurality of driving walls are provided alternately; a plurality of drive electrodes provided in each of the plurality of channels, wherein the drive walls are deformed to eject ink from the plurality of nozzles by applying a drive voltage to each of the plurality of electrodes; wherein neighboring rows of the plurality of rows are placed so that they are shifted from each other by half a pitch of the channels of the neighboring rows, and each of the plurality of channels are provided with an opening on a front surface of the head chip and an opening on a back surface of the head chip; wherein all the channels of the plurality of channels are ejecting channels that eject ink; 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 connection electrodes for row A that conduct electrically to a plurality of drive electrodes for row A are respectively arranged extending from each of the plurality of channels of row A to the end of the head chip with a pitch equal to the pitch of the channels of row A, and a plurality of first connection electrodes for row B that conduct electrically to a plurality of drive electrodes for row B are respectively arranged between each of the plurality of channels of row A and each of the plurality of channels of the row B with a pitch equal to the pitch of the channels of row B; and wherein a plurality of second connection electrodes for row B are arranged between neighboring connection electrodes for row A among the plurality of connection electrodes for row A with a pitch equal to the pitch of the plurality of first connection electrodes, separately from the plurality of first connection electrodes; and a plurality of wirings adapted to electrically connect the first connection electrodes and the second connection electrodes respectively, wherein the plurality of wirings arranged not to contact the back surface of the head chip except for the first connection electrodes and the second connection electrodes.