Patent ID: 7232207

Claim:
An ink jet head comprising: a head chip formed substantially in rectangular solid having six outer planes of a front plane, a rear plane, a top plane, a bottom plane, and two opposite side planes, wherein the head chip has drive walls made up of piezoelectric elements and channel portions alternately arranged in parallel, the channel portions are enclosed with the drive walls, the top plane and the bottom plane, and outlets and inlets of the channel portions are arranged in an opposite manner at the front plane and the rear plane of the head chip respectively; a nozzle plate fixed on the front plane of the head chip; a top-side base plate fixed on the top plane of the head chip, the top-side base plate having a first extended portion extending rearward beyond the rear plane of the head chip; a bottom-side base plate fixed on the bottom plane of the head chip, the bottom side base plate having a second extended portion extending rearward beyond the rear plane of the head chip; an ink supply room forming member for forming an ink supply room to supply ink to each of the channel portions, the ink supply room forming member being provided at the rear plane side of the head chip, sandwiched by the first extended portion of the top-side base plate and the second extended portion of the bottom-side base plate; first lead wires to be electrically connected to their respective drive electrodes formed on the drive walls, the first lead wires being formed on a fixed plane surf ace of the head chip where the head chip is fixed to at least one of the top-side base plate and the bottom-side base plate; and second lead wires to be electrically connected to their respective first lead wires, the second lead wires being formed on a plane surface of at least one of the top-side base plate or the bottom-side base plate at the side of the fixed surface of the head chip wherein each of the second lead wires is superposed on a respective lead wire of the first lead wires to form direct electrical connections between the first lead wires and the second lead wires.