| 摘要 |
A driving method of a droplet ejection head having plural channels separated by sidewalls formed with piezoelectric material, the channels being divided into three groups; and an electric voltage pulse is applied to each of the groups sequentially in a time-sharing mode, and to generate a shear deformation of the sidewall, and liquid is ejected as a droplet from a nozzle, wherein applying process of the pulse includes: a first step for enlarging a volume of a channel; a second step for keeping the enlarged volume; a third step for reducing the volume; a fourth step for keeping the reduced volume; and a fifth step for enlarging the volume, wherein the third step starts when alpha/beta<=1/3 is satisfied for the protruded pillar at an adjoining channel nozzle driven just before; where alpha denotes a width of the pillar, and beta denotes a maximum width of the pillar.
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