Patent ID: 6059393
Filing Date: 2000-05-09
Classification: B41J

Abstract:
A method of driving an ink ejection device that includes walls defining an ink channel, the ink channel having a volume filled with ink and having a length defined by two ends, a nozzle plate attached to one end of the ink channel and formed with a nozzle, an actuator coupled to each of the walls for changing the volume of the ink channel, and control means for applying pulse signals to the actuator, the method comprising the steps of:(a) applying a first pulse signal to the actuator, causing ejection of a first ink droplet from the nozzle at a first speed; and(b) after ejection of the first ink droplet, applying a second pulse signal to the actuator, causing ejection of a second ink droplet from the nozzle at a second speed faster than the first speed so that the second ink droplet merges with the first ink droplet before individually impinging against a recording medium held in a predetermined position and that a merged ink droplet impinges against the recording medium within 100 .mu.sec of merger, whereby a diameter of a point dot on the recording medium is substantially maximized for a given volume of ink.