Patent ID: 7748811

Claim:
A liquid jet apparatus, comprising: a liquid jet head, comprising; a canal unit comprising a continuous liquid canal from a common liquid chamber to a nozzle opening via a pressure chamber, and having a diaphragm part that changes a volume of the pressure chamber; a first actuator unit and a second actuator unit, each including a pressure generating element configured to change a shape of the diaphragm part to change pressure on liquid contained in the pressure chamber; and a head case having at least one accommodation chamber to accommodate the first and second actuator units and a canal fixing surface to fix the canal unit, the at least one accommodation chamber including a first accommodation chamber, a second accommodation chamber, with a partition wall placed between the first accommodation chamber and the second accommodation chamber; and the liquid jet head configured to eject a liquid droplet from the nozzle opening by driving of the pressure generating element to change the pressure on the liquid contained in the pressure chamber; and a driving signal generating circuit configured to generate driving signals including ejection pulses to drive the pressure generating element to eject the liquid droplet, the driving signals including a first driving signal being supplied to the first actuator unit and a second driving signal being supplied to the second actuator unit, wherein the first driving signal includes a first ejection pulse and the second driving signal includes and a second ejection pulse, the second ejection pulse being initiated after a delay time Δt from the time at which the first ejection pulse is initiated, and wherein the delay time Δt falls within a range of plus or minus Tw/4 of Tw−Tp, where Tw represents a natural vibration cycle of the partition wall and Tp represents a time delay between the time at which the pressure generating element is driven with the second ejection pulse of the second driving signal and the time at which the liquid droplet is ejected.