Patent ID: 8567917

Claim:
A method of stirring liquid in a droplet discharge head wherein droplets of the liquid are discharged from a plurality of nozzle openings by driving piezoelectric elements provided to each of the nozzle openings, the method of stirring liquid in a droplet discharge head comprising: a step of causing the liquid corresponding to the piezoelectric elements to flow at different pressures by varying drive conditions of the piezoelectric elements, wherein the droplet discharge head has: a plurality of flow channel groups each having a plurality of flow channels that feeds the liquid to the nozzle openings, the flow channels being respectively provided to the nozzle openings; and a liquid reservoir that retains the liquid, the liquid reservoir being connected to each of the flow channels, wherein the piezoelectric elements in each of the flow channel groups are driven in the same direction while the piezoelectric elements in the flow channel groups that are adjacent to each other via the liquid reservoir are driven in mutually opposite directions.