Patent ID: 7621623

Claim:
A recording head comprising: an ink reservoir that reserves ink; ejection nozzles that eject ink; and at least one ink supply path through which ink, reserved in the ink reservoir, is supplied to the ejection nozzles; wherein the ink supply path includes: a pressure chamber provided with a piezoelectric element for changing pressure inside of the ink supply path in order to eject ink in the ink supply path from the ejection nozzles; a restriction part disposed between the ink reservoir and the pressure chamber so as to inhibit ink in the pressure chamber from reversely flowing toward the ink reservoir; and a coupling portion connecting the pressure chamber and the restriction part; and wherein the restriction part, the coupling portion, and the pressure chamber are designed such that sizes of respective portions of the ink supply path, perpendicular to the flow of the ink, become larger in order of the restriction part, the coupling portion, and the pressure chamber.