| 摘要 |
PROBLEM TO BE SOLVED: To keep durability and to reduce production cost. SOLUTION: A flow passage unit is constituted by laminating a nozzle plate 3 having a plurality of nozzle orifices 2 bored therein, a flow passage forming substrate 8 having a plurality of pressure generating chambers 5 communicating with a plurality of the nozzle orifices 2 and a reservoir 7 supplying ink to a plurality of the pressure generating chambers 5 through a plurality of ink supply ports 6 and including mutually opposed first and second surfaces 8a, 8b and a lid material 11 sealing the first surface 8a of the flow passage forming substrate 8. Piezoelectric vibrators for pressurizing the ink in the pressure generating chambers 5 are provided. A through-hole becoming the reservoir 7 is formed in the metal plate material including the first and second surfaces 8a, 8b so as to pierce the first and second surfaces 8a, 8b and a plurality of recessed parts becoming a plurality of the pressure generating chambers 5 are formed to the first surface 8a of the metal plate material by press processing to constitute the flow passage forming substrate 8. |
