Patent ID: 8317303

Claim:
A liquid-droplet jetting apparatus which jets a droplet of a liquid, comprising: a channel unit having a liquid channel formed therein, the liquid channel having: a plurality of nozzles; a plurality of pressure chambers which communicate the liquid with the nozzles respectively and which are arranged in a row in a predetermined plane along a predetermined row direction; a plurality of liquid supply chambers which are arranged to be mutually adjacent and which extend in the predetermined row direction; and a plurality of communication channels each of which communicates the liquid with one of the pressure chambers and one of the liquid supply chambers and which are formed in a shape so that the communication channels have channel resistances which are same; wherein the liquid passes through both the pressure chambers and the liquid supply chambers; and a jetting-pressure applying mechanism which applies jetting pressure to the liquid in the pressure chambers; wherein the plurality of communication channels have channel lengths which are mutually different; wherein, among the plurality of communication channels a communication channel having a longer channel length than another communication channel has a larger channel cross sectional area than that of the another communication channel; and wherein each of the liquid supply chambers is communicated with plural nozzles, plural pressure chambers, and plural communication channels, respectively.