Ink cartridge, image forming apparatus, and method to manufacture ink cartridge

Abstract

An ink cartridge to prevent image degradation due to a misalignment of nozzles in a transfer direction of a printing medium and a transverse direction includes a print head substrate, a first head unit including at least one first print head chip which is disposed on the print head substrate and includes 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 including 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 includes a plurality of second nozzles arranged in plural lines in the second direction, thereby forming a second line spaced from the first line, and 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:≦(±⅛)*(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.