Patent ID: 6494554
Filing Date: 2002-12-17
Classification: B41J

Abstract:
An ink-jet printer comprising:a droplet outlet orifice through which an ink droplet is ejected; an ink chamber for supplying ink to the outlet orifice; first pressure generating means for generating a first pressure in response to a first voltage waveform for ejecting the ink droplet through the outlet orifice by changing a volume of the ink chamber through displacement thereof; second pressure generating means for generating a second pressure in response to a second voltage waveform for aiding ejection of the ink droplet and suppressing generation of minute ink droplets accompanying the ink droplet ejected through the outlet orifice by changing the volume of the ink chamber through displacement thereof; and ejection control means for controlling a state of the displacements of the first pressure generating means and the second pressure generating means by forming the first voltage waveform as two pulses spaced apart by a first time period and by forming the second voltage waveform as two pulses spaced apart by a second time period longer than the first time period.