| 摘要 |
PURPOSE:To prevent the intrusion of bubbles from the nozzle hole side effectively by forming a projected section or a concave section to the wall of a flow path in the vicinity of a nozzle hole for the flow rate of ink in an ink jet head. CONSTITUTION:The projected section 8 or the concave section 9 with different tilt angles is formed into an ink flow path pipe 3 in the vicinity of the nozzle hole 2 in the ink jet head, and the projected section or the concave section is made to function as a stopper to bubbles intruding in the direction of the arrow A from the nozzle hole 2 side, and is not made to function as a stopper to bubbles discharged in the direction of the arrow B from the nozzle hole 2 side. |
