| 摘要 |
A method for producing an inkjet recording head includes preparing the substrate having a through hole to be formed into a supply port, the through hole having openings on the first surface and the second surface, the substrate having a first protective layer disposed on the second surface, the first protective layer having an overhang extending into the region of the opening on the second surface. The method also includes forming a second protective layer so as to continuously cover at least the overhang of the first protective layer and the inner wall of the through hole, and removing a portion of the second protective layer corresponding to the opening on the first surface.
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