Patent ID: 7503640

Claim:
An ink-jet head which jets an ink onto a medium, comprising: a plurality of independent manifolds, each independent manifold configured to store the ink; a first nozzle row including a plurality of first nozzles which are arranged in a first direction and which jet a black ink; a second nozzle row including a plurality of second nozzles which are arranged in the first direction and which jet a color ink contributing to a full color printing; and a third nozzle row including a plurality of third nozzles which are arranged in the first direction and which jet a special color ink which is an ink other than the black ink and the color ink, wherein the first nozzle row, the second nozzle row, and the third nozzle row are aligned in a second direction which intersects with the first direction, and the third nozzle row is arranged at an end with respect to the second direction, the first nozzle row comprises two first nozzle sub arrays, wherein the first nozzles in each first nozzle sub array are aligned in the first direction at the pitch P, and the two first nozzle sub arrays are shifted by P/2 in the first direction, the second nozzle row comprises a plurality of second nozzle sub arrays, each second nozzle sub array comprising a predetermined number of the second nozzles arranged in the first direction at the pitch P, the second nozzles belonging to each of the second nozzle sub arrays are aligned in the first direction, and the color ink includes a plurality of sub color inks which are different in color, and each of which is jetted from second nozzles belonging to one of the second nozzle sub arrays, the third nozzle row comprises two third nozzle sub arrays, each third nozzle sub array comprising a predetermined number of third nozzles aligned in the first direction at the pitch P, and the two third nozzle sub arrays are shifted by P/4 in the first direction with respect to the first nozzle sub array, the first nozzle row, the second nozzle row, and the third nozzle row are aligned in the second direction which intersects with the first direction, and the third nozzle row is positioned at a furthermost end in the second direction, and the manifolds are configured to be in fluid communication with the first, second, and third nozzle sub arrays respectively, and each of the manifolds is configured to be in fluid communication with one of the first, second, or third nozzle sub arrays.