Patent ID: 7059708

Claim:
An inkjet head for ejecting ink droplets, comprising: a substrate; pressurizing elements that are provided on said substrate, each pressurizing element pressurizing ink; a nozzle plate that is spaced from said substrate and furnished with ejection nozzles, wherein said ink as pressurized by each pressurizing element is ejected as a droplet through each ejection nozzle; ink channels provided in a gap between said substrate and said nozzle plate, each ink channel being closed at one end and permitting the ink to be supplied at another end and flow toward an ink pressurizing zone where said pressurizing element and said ejection nozzle are positioned on wall surfaces in said ink channel; and ink circulation paths, each being provided in said ink channel such that ink pressurizing energy which has been produced by pressurizing said ink with said pressurizing element and which is traveling from said ink pressurizing zone toward downstream of ink supply flow is allowed to propagate toward more upstream of said ink supply flow than said ink pressurizing zone, whereby said ink pressurizing energy is returned toward said ink pressurizing zone.