| 摘要 |
An inkjet head includes a pressure chamber and a piezoelectric device. A cross-sectional shape of the pressure chamber in a direction substantially perpendicular to the up-down direction includes a circular-arc-shaped side wall portion formed on the ink supply side, and linear side wall portions forming such a shape that the distance between the linear side wall portions gradually decreases toward the side opposite to the supply side. The piezoelectric device includes a displacement portion and an electrode connection portion. A cross-sectional shape of the displacement portion in the direction substantially perpendicular to the up-down direction includes a circular-arc-shaped portion formed inside the circular-arc-shaped side wall portion and having a smaller cross section in the direction substantially perpendicular to the up-down direction than a corresponding cross section of the shape formed by the circular-arc-shaped side portion, and a linear portion formed inside the linear side wall portions and having a smaller cross section in the direction substantially perpendicular to the up-down direction than a corresponding cross section of the shape formed by the linear side portions. The electrode connection portion is connected to the linear portion on the side opposite to the circular-arc-shaped portion in such a position as to overlap with a side wall portion of the pressure chamber in the up-down direction. |
