| 摘要 |
PROBLEM TO BE SOLVED: To make small a fly speed difference between main ink drops and satellite ink drops. SOLUTION: A driving signal generation circuit generates small dot driving pulses including a first discharge element P3 for expanding the interior of a pressure chamber so as to draw a meniscus to the pressure chamber, a second charge element P5 for slightly shrinking the pressure chamber expanded by the first discharge element, a second discharge element P7 for expanding again the pressure chamber shrunken by the second charge element, and a third charge element P9 for shrinking the pressure chamber expanded by the second discharge element. A supply time of the first discharge element is set to be not larger than half a natural oscillation period of the pressure chamber. At the same time, a driving voltage of the second charge element is set to be not larger than 60% a driving voltage in a driving signal, and a driving voltage of the third charge element is set to be not smaller than 75% the driving voltage in the driving signal.
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