Patent ID: 6799821
Filing Date: 2004-10-05
Classification: B41J

Abstract:
A method for driving an ink jet recording head, comprisingapplying a driving voltage to an electro-mechanical converter to deform the electro-mechanical converter to thereby change a pressure in the pressure generating chamber filled with ink, thus ejecting ink droplets with a size of about 5 to about 25 &mgr;m through a nozzle in communication with the pressure generating chamber, wherein said applying said driving voltage comprises: a first voltage changing process which applies a voltage in a direction that increases a volume of said pressure generating chamber; a second voltage changing process which applies a voltage in a direction that reduces the volume of said pressure generating chamber; and a third voltage changing process which applies a voltage in a direction that increases the volume of said pressure generating chamber again, wherein voltage changing times t2 and t3 during the second and third voltage changing processes have such lengths as shown below, relative to a resonance frequency Tc of a pressure wave generated in the pressure generating chamber: 02c/2 03c/2 and, â€ƒwherein said nozzle has an opening diameter of about 20 to less than 30 &mgr;m, and wherein said driving voltage changing times are based upon said resonance frequency.