| 摘要 |
An ink jet head includes a plurality of energy generating elements for generating energy for ejecting an ink droplets; a substrate including an ink supply port extending in a direction, with the energy generating elements arranged on both sides of the ink supply port; a plurality of ink ejection outlets provided corresponding to the energy generating elements, respectively, to form arrays of ink ejection outlets disposed on the respective sides of the ink supply port, wherein the ink ejection amount of one array of ink ejection outlets is different from that of another array of ink ejection outlets; an ejection outlet plate portion provided on the substrate so as to be opposed to the ink supply port; a plurality of ink flow paths for fluid communication between the ink supply port and the ink ejection outlets, respectively; a beam-like projection projected from the ejection outlet plate portion toward the ink supply port so as to oppose the ink supply port; and reinforcing ribs integral with the beam-like projection and contacting the substrate. The reinforcing ribs are provided only on the side of the array of the ejection outlets which has a larger ejection amount than that of another array of the ejection outlets.
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