| 摘要 |
<p>The output surface (18) of an acoustic printhead (10) having one or more concave acoustic beam-forming devices for supplying focused acoustic beams (17) to eject droplets (19) of ink (13) on demand from the surface (18) of a pool of ink (13) is planarized by filling those concave devices with a solid material (21) having an acoustic impedance and an acoustic velocity which are intermediate the acoustic impedance and the acoustic velocity, respectively, of the ink (13) and of the printhead (10). This not only facilitates the cleaning of the printhead (10), but also eliminates the edges upon which an optional ink transport or the like may tend to drag. The outer surface of the filler (21) may be essentially flush with the face of the printhead (10), or the filler (21) may overcoat the printhead (10).</p> |
