| 主权项 |
1. A driving device of a liquid-jet head, the liquid jet head having a piezoelectric device arranged corresponding to each of nozzles, the piezoelectric device having mutually facing electrodes, and a driving, signal being applied to the piezoelectric device for causing a corresponding one of the nozzles to eject a liquid drop, the driving device comprising:
a plurality of switching devices connected in parallel to each other, one of the electrodes being connected to first ends of the switching devices while the other electrode is connected to a reference potential having a reference potential; a driving signal source configured to generate a driving signal for selectively ON or OFF controlling the switching devices, the driving signal source being connected to second ends of the switching devices; and a control unit configured to switch the driving signal generated from the driving signal source to ON or OFF control the switching devices, wherein at least one of the switching devices is connected in parallel to remaining ones of the switching devices that are OFF-controlled, and said at least one of the switching devices has electrically conducting properties configured to cause a liquid drop not to be ejected from a corresponding one of the nozzles when a driving signal is applied to said at least one of the switching device in an ON-controlled status, and all of said at least one of the switching devices having the electrically conducting properties configured to cause liquid drops not to be ejected from the corresponding nozzles are ON-controlled, while one or more of the remaining ones of the switching devices are ON-controlled for causing one or more of the nozzles to eject liquid drops. |
