| 摘要 |
A recording element unit includes a support member, a recording element provided on the support member and having a wiring layer for supplying electrical signals, and a bump-shaped electrode connected to the wiring layer so as to be raised therefrom. The bump-shaped electrode includes a plurality of raised portions. Such a bump-shaped electrode is also included in a recording element driving unit, an ink jet unit, and an ink jet driving unit. This arrangement solves the problem of the low reliability of the electrical connection between a recording element substrate, on which the electrode is positioned, and a driving element substrate, for driving the recording element. The unit also includes first and second protective layers with the second protective layer having a thickness greater than that of the first. This feature provides structural strength to the support member in order to prevent warping.
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