| 摘要 |
PURPOSE:To avoid the dispersion of discharge speeds as well as to attain high- speed and high-density discharge of liquid by a simple wiring system in which heating elements of different minimum demand powers necessary for discharge a minimum of liquid in liquid path, wiring parts for them, and a pair of electrode to supply power concurrently to the heating elements are provided. CONSTITUTION:Three (for example) heating elements 401, 402 and 403 of different horizontal-vertical ratios are provided to have different minimum demand powers necessary for forming air bubbles, and connectors 411 of sufficiently lower resistance values than the heating element are provided to connect them in series for example. When voltage V1 enough to form air bubbles only in the element 401 is applied between paired electrodes 412 and 413, the power density of each heating element is such as shown by solid lines in Fig. and the power intensities of the elements 402 and 403 are lower than those necessary for forming air bubbles, where no labile small bubbles occur. When voltage V2 enough to generate air bubbles in the elements 401 and 402 is applied larger liquid droplets are discharge. When the voltage is increased to V3, bubbles are generated in all of the elements 401-403 and much larger liquid droplets are discharged. |
