Patent ID: 6109716
Filing Date: 2000-08-29
Classification: B41J

Abstract:
An ink-jet printing apparatus comprising:a printing head having an ink channel, an actuator for changing a volume of the ink channel and a nozzle connected with the ink channel to eject the ink from the ink channel onto a print media; anda drive circuit connected to the printing head for applying a first drive pulse signal to the actuator so that the ink channel is expanded a volume thereof to generate a pressure wave in the ink channel and, after a lapse of an approximate odd-numbered multiple of one-way propagation time T of the pressure wave in the ink channel, an expanded volume of the ink channel is decreased to normal state thereof to apply pressure to the ink in the ink channel for ejecting the ink from the ink channel through the nozzle,wherein the drive circuit, after applying the first drive pulse signal to the actuator, applies to the actuator a second drive pulse signal which has a center thereof in a range of approximately 2.25 to 2.75 times the one-way propagation time T from an end time of the first drive pulse signal.