Patent ID: 7748826

Claim:
A printing head structured to include ejection opening-array groups, which include a plurality of ejection opening arrays from which ink of a same color and of a same volume is ejected, for each color and volume of ink to be ejected, wherein the plurality of ejection opening-array groups include ejection opening-array groups of first and fifth arrangements from which inks of a first color are ejected, ejection opening-array groups of second and fourth arrangements from which inks of a second color are ejected, and an ejection opening-array group of a third arrangement from which ink of a third color is ejected, the ejection opening-array group of the first arrangement and the ejection opening-away group of the second arrangement are adjacent to each other, the volume (Va) of ink ejected from the ejection opening-array groups of the first arrangement and the volume (Va) of ink ejected from the ejection opening-array group of the second arrangement are substantially the same as each other, the ejection opening-array group of the fourth arrangement and the ejection opening-array group of the fifth arrangement are adjacent to each other, the volume (Vb) of ink ejected from the ejection opening-array groups group of the fourth arrangement and the volume (Vb) of ink ejected from the ejection opening-array groups group of the fifth arrangement are substantially the same as each other, and the volume (Va) is different from the volume (Vb).