Patent ID: 6231151
Filing Date: 2001-05-15
Classification: B41J

Abstract:
In an inkjet recording apparatus for expelling an ink droplet by using a piezoelectric element, a method for expelling the ink droplet comprising the steps of:(a) outputting a drive pulse voltage from a driver to the piezoelectric element, the drive pulse voltage having a waveform consisting of a plurality of ramps,wherein a first energy is produced by the piezoelectric element in response to the drive pulse voltage such that an ink droplet is expelled from an ink channel in response to the first energy; and(b) outputting a supplemental pulse voltage from the driver to the piezoelectric element after the output of the drive pulse voltage is complete, wherein a second energy is produced by the piezoelectric element in response to the supplemental pulse voltage such that a reflected wave of ink in the ink channel is reduced in response to the second energy; and(c) repeating steps (a) and (b); and(d) outputting a second supplemental pulse voltage from the driver to the piezoelectric element before each step (a), wherein the second supplemental pulse voltage has a polarity which is the same as that of the drive pulse voltage.