Patent ID: 8342648

Claim:
An inkjet head comprising nozzles and supply ports, each nozzle including an ejection orifice through which ink is ejected and a flow path which communicates with the ejection orifice, and each supply port communicating with a plurality of the flow paths, wherein a first nozzle row, a second nozzle row, and a third nozzle row are arranged next to each other, the first nozzle row including a plurality of the nozzles that eject ink of a first color, the second nozzle row including a plurality of the nozzles that eject ink of a second color, and the third nozzle row including a plurality of the nozzles that eject ink of a third color, wherein at least one of the first to third nozzle rows include a large nozzle row and a small nozzle row, the large nozzle row including a plurality of the nozzles that eject a relatively large amount of ink and the small nozzle row including a plurality of the nozzles that eject a relatively small amount of ink, and wherein, when A is the average cross section along a direction perpendicular to an ink supplying direction of a liquid path from each supply port to each ejection orifice and L is the length of the liquid path in the ink supplying direction, the nozzle row of which the value of A/L is smallest of the plurality of nozzle rows is disposed outside an area between the large nozzle rows that are arranged next to each other.