| 摘要 |
<p>A droplet spraying device capable of increasing a liquid supply amount per unit time and ejecting liquid constantly without producing bubbles in the liquid in a pressurizing room. As shown by an elapsed time of voltage signals applied to a piezoelectric/electrostriction elements in a drive circuit, within fall times T3, T4 during which discharges with different discharge time constants are conducted sequentially, a first discharge time is set to be larger than a second discharge time and the liquid is sucked at a slow feed speed through introduction holes after ejection to thereby allow the liquid to uniformly flow in through a plurality of introduction holes without carrying bubbles into a liquid pressurizing room from a nozzle side. On the other hand, since a liquid started to move can be quickly sucked with a smaller second discharge time constant, the liquid can be supplied smoothly and a drive frequency time T5 can be shortened compared with a case where the liquid is sucked with the first time constant to the last, whereby a large amount of liquid per unit time can be ejected constantly.</p> |
