| 摘要 |
PROBLEM TO BE SOLVED: To improve moldability, including molding accuracy and dimensional stability, of a top plate in which ink channels and ejection openings are formed. SOLUTION: A top plate 5 provided integrally with an orifice plate 6 arranged with ink ejection openings 6a, nozzles 7 communicating with the ink ejection openings 6a, ink liquid chambers and ink supply openings is bonded onto a heater board 1 arranged with ejection heaters 1a. The top plate 5 is constituted of a first basic body comprising the nozzles 7 and the orifice plate 6, and a second basic body comprising other parts and they are integrated by bonding through two-color molding.
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