| 摘要 |
There is provided a condition; nxT</=P</=(n+0.4)xT between a pulse width P of the driving voltage that is to be applied to said piezoelectric element 7 of a piezoelectric plate 6 and a time T needed for that a pressure wave of ink, which generates when the ink chamber 2 is pressurized through the piezoelectric element 7, travels through the ink chamber by a length thereof. Under the condition, each of the piezoelectric elements 7 is driven. Here, the "n" is an integral odd number (preferably, 1 or 3).
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