| 摘要 |
PROBLEM TO BE SOLVED: To control a volume of an ejected ink drop by suppressing fluctuation of an ink ejection speed by reducing a residual vibration of the ejected ink drop. SOLUTION: As a driving signal for ejecting an ink drop from a nozzle by expanding or contracting a volume of a pressurizing chamber by operating an actuator, a rectangular wave-like first pulse 23 for expanding the volume of the pressurizing chamber, a second pulse 24 for contracting the volume, a rectangular wave like third pulse 25 for expanding the volume, and a fourth pulse 26 for contracting the volume are sequentially generated. When a half of a natural vibration cycle of the ink in the pressurizing chamber is represented by 1AL, a time difference between the center of the pulse width of the first pulse and the center of the pulse width of the third pulse is set to be 1AL, and a time difference between the center of the pulse width of the second pulse and the center of the pulse width of the fourth pulse is set to be 1AL. COPYRIGHT: (C)2004,JPO
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