Patent ID: 9457562
Filing Date: 2016-10-04
CPC Classification: B41J

Claim Text:
1. A liquid ejection device comprising: an ink jet head in which a plurality of nozzle portions are arranged in a matrix in a row direction and a column direction which obliquely intersects the row direction; a plurality of pressurizing elements that are provided so as to correspond to the plurality of nozzle portions and generate an ejection force for ejecting a liquid from the corresponding nozzle portions; and a driving voltage supply unit that supplies a driving voltage to the plurality of pressurizing elements, wherein the ink jet head is provided with supply flow paths for supplying the liquid to the plurality of nozzle portions, the plurality of nozzle portions which are supplied with the liquid from the same supply flow path are divided into two or more groups, the driving voltage supply unit supplies an ejection driving voltage for ejecting the liquid to each of the groups when a dummy jet is performed, and, during a period of time when the dummy jet is performed for one group, supplies a non-ejection driving voltage for preventing the liquid from being ejected to the other groups, wherein, among a plurality of nozzle portions arranged in the column direction, nozzle portions belonging to the same group are arranged such that the group's nozzles are separated from one another by an interval of two or more nozzles.