Patent ID: 6702414
Filing Date: 2004-03-09
Classification: B41J

Abstract:
A driving method for an ink jet recording head which comprises the steps of applying driving voltage to a driving device, generating a pressure change in a pressure generating chamber filled with ink by a drive of the driving device, and ejecting an ink droplet from a nozzle connected to the pressure generating chamber by the pressure change, the method being characterized in that:a voltage waveform of the driving voltage at least comprises a first voltage changing process for inflating the volume of the pressure generating chamber and a second voltage changing process for deflating the volume of the pressure generating chamber after the first voltage changing process; and a voltage changing time t1 of the first voltage changing process and a time interval t2 between the finish time of the first voltage changing process and the start time of the second voltage changing process are set so as to almost satisfy the following relational expression: t2=t0-t1t0=Tc2&it;â€ƒ&it;Ï€&it;tan-1&af;[sin&af;(2&it;â€ƒ&it;Ï€Tc&CenterDot;t1)cos&af;(2&it;â€ƒ&it;Ï€Tc&CenterDot;t1)-1](Tc: pressure wave resonance frequency in a pressure generating chamber).