| 摘要 |
<p>Small ink droplets smaller than the nozzle diameter can be stably ejected even at high drive frequency. A method for driving an ink jet recording head comprising ejecting ink droplets (1) from a nozzle (7) communicating with a pressure generating chamber (2) by applying a drive voltage to a piezoelectric actuator (4) to change the pressure in the pressure generating chamber (2), further comprises a first voltage changing step of applying a drive voltage in a direction to expand the pressure generating chamber (2), a second voltage changing step of applying a voltage in a direction to compress the pressure generating chamber (2), and a third voltage changing step of applying a voltage in a direction to expand the pressure generating chamber (2) again, wherein the relationship among the voltage changing times t2 and t3 in the second and third voltage changing steps and the natural period Tc of the pressure wave produced in the pressure generating chamber (2) satisfy the inequalities 0 < t2 < Tc/2 and 0 < t3 < Tc/2.</p> |
