Liquid ejector

摘要

An acoustic conductor has an outer surface which presents a parabola in cross section and reflects acoustic wave given to a first surface by a vibration excitor and focuses it onto the vicinity of a second surface. A focal point of the parabola is set above the second surface. Ink is supplied onto the second surface through a supplying path and its liquid level is positioned separately from the second surface more than the focal point. The acoustic wave is focused onto the focal point existing in the ink, resulting in increase in the acoustic energy of the ink, and an ink droplet is ejected.