Patent ID: 6962398

Claim:
A driving method for an ink jet recording head, including an electromechanical transducer for causing a pressure change in a pressure generating chamber filled with ink so that an ink droplet is discharged from a nozzle connected to the pressure generating chamber, said method comprising: applying to the transducer a voltage having a waveform comprising a first voltage change for expanding the transducer to compress the volume of the pressure generating chamber, so as to discharge an ink droplet from the nozzle, and a second voltage change for compressing the transducer to expand the volume of the pressure generating chamber, wherein a start time, a voltage changing time, and a voltage variation of the second voltage change are set so that a first peak value v 1 and a second peak value V 2 of particle velocity of ink in the nozzle satisfy the condition 0.3≦v 2 /v 1 ≦0.6, and wherein a time interval between a finish time of the first voltage change and the start time of the second voltage change is approximately one-half the resonance period of a pressure wave generated in the pressure generating chamber.