Patent ID: 8393711
Filing Date: 2013-03-12
Classification: B41J

Abstract:
1. An ink-jet head comprising: a plurality of lines of nozzles formed on a nozzle surface; a plurality of lines of pressure chambers communicating with the respective nozzles; and a plurality of driving portions respectively corresponding to the pressure chambers, each of which changes the volume of corresponding one of the pressure chambers to eject ink from corresponding one of the nozzles, the driving portions being divided into a plurality of groups such that the groups are arranged in a first direction being perpendicular to a second direction in which the ink-jet head moves relatively to a print medium, each group corresponding to a same color ink, each group having a plurality of lines of driving portions, each line of which is extending in the first direction such that at least one of the driving portions in each group overlaps with at least one of the driving portions in a neighboring group, in the first direction, wherein one group of the driving portions is apart from a neighboring group of the driving portions at a distance greater than a distance between the driving portions, which are neighboring each other, in the one group, and there are no driving portions between the one group and the neighboring group.