Patent ID: 7988257

Claim:
An ink cartridge, comprising: a print head substrate; a first head unit comprising at least one first print head chip which is disposed on the print head substrate and comprises a plurality of first nozzles arranged in plural lines in a second direction perpendicular to a first direction which is a transfer direction of a printing medium, thereby forming a first line in the second direction; and a second head unit comprising at least one second print head chip which is disposed on the print head substrate and which has an ink jetting area overlapping a predetermined area of the first line, thereby forming an overlapping area, and which comprises a plurality of second nozzles arranged in plural lines in the second direction, thereby forming a second line spaced from the first line, wherein dots formed by the first and the second nozzles, which neighbor each other in the overlapping area when jetting ink, have a gap with respect to the first and the second directions within a range satisfying the following equation: T ≦( n ±⅛)* P ( n is integer) wherein “T” denotes a gap between dots formed by the first and the second nozzles neighboring each other, and “P” denotes a pixel value.