| 摘要 |
An ink-jet recording head driving method and an ink-jet recording device wherein the quantity of ink composing an ink droplet can be reduced as much as possible without deteriorating the flying speed of an ink droplet and, consequently, a dot suitable for graphic printing can be formed. A pressure generating chamber is expanded or contracted by driving a piezoelectric layer provided on the pressure generating chamber communicating with a nozzle opening and a reservoir so as to jet an ink droplet from the nozzle opening. A preparatory process is provided for preparing for the jetting of ink by expanding a pressure generating chamber and backing a meniscus from the surface of the nozzle opening before a first contraction process for contracting the pressure generating chamber to jet ink from a nozzle opening. The quantity of ink composing an ink droplet can be reduced as much as possible without deteriorating the flying speed of the ink droplet by setting the duration of the preparatory process to ½ or less of Helmholtz vibrational cycle Tc of the pressure generating chamber and setting the volume of contraction in the first contraction process to 50% or less of the volume of expansion in the preparatory process. As a result, a dot suitable for graphic printing can be formed.
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