Patent ID: 8337002

Claim:
An ink ejection head unit comprising: a head configured to eject ink drops from at least two nozzles, said head including a common liquid chamber connected to the at least two nozzles, said common liquid chamber having a supply opening and an ejection opening; and a tank connected to the head, said tank including: an ink containing section configured to contain ink to be supplied to the head, a supply path configured to supply the ink from the ink containing section to the supply opening, an ejection path configured to eject the ink ejected from the ejection opening to an outside of the ink ejection head unit, and a communication path configured to communicate the highest section of a seal of the ink containing section with a section of the ejection path higher than the highest section of the seal, wherein fluid resistance of the communication path is larger than the total fluid resistance of a path from the supply opening to the ejection opening.