Patent ID: 8550605

Claim:
An inkjet head structure, comprising: channel member comprising a ceramic sintered compact having a channel penetrating from a first main surface to a second main surface; a pressurization mechanism arranged on the side of the second main surface of the channel member, the pressurization mechanism being adapted to pressurize ink supplied via the channel member; and a recording element substrate having a plurality of the ink discharge ports adapted to discharge the pressurized ink, the recording element substrate being arranged on the side of the second main surface, wherein an opening of the channel on the side of the second main surface has an elongated shape and a diameter of an opening of the channel on the side of the second main surface along a longitudinal direction is larger than a diameter of an opening on the side of the first main surface along said longitudinal direction, and wherein an inner surface of the channel has an inclination section being inclined such that a diameter of the channel is increased along the longitudinal direction from the side of the first main surface to the side of the second main surface, a parallel section being continuous to the inclination section, which is substantially parallel to the first main surface and exposed to the side of the second main surface, and a wall section provided between the second main surface and the parallel section and being continuous to the second main surface, the wall surface being vertical to the second main surface, and wherein a plurality of the ink discharge ports is provided in the recording element substrate along the longitudinal direction, and the parallel section of the channel is arranged on the outer side in the longitudinal direction of the ink discharge port on the outermost side along the longitudinal direction.