| 摘要 |
<p>The invention relates to a device for dispensing very small amounts of compound volumes of liquids. It comprises three layers (5, 1, 2) made e.g. of silicon, including an actuation layer (5), by which the ejecting membrane (14) of the device is provided, a first guiding layer (1) containing means for guiding the first liquid, and a second guiding layer (2) for guiding the second liquid. The ejecting membrane (14) is activated by a piezoelectric element (6). Between the ejecting membrane (5) and the first guiding layer (1) a first chamber (3) is formed. Between the first guiding layer (1) and the second guiding layer (2) a second chamber (4) is formed; said first chamber having an inlet (11) and an outlet (12), and a first nozzle/orifice (1), said nozzle/orifice being disposed in line with the piezoelectric element (6). The second chamber (4) are provided with an inlet (7) and an outlet (8) together with a second nozzle/orifice (2), disposed in line with the first nozzle/orifice and the piezoelectric element. The chambers (3, 4), the piezoelectric element (6) and the nozzle/orifices (1, 2) are disposed such that a liquid volume ejected from the first chamber (3), by means of power from the piezoelectric element (6), passes through the second nozzle/orifice (2) and becomes surrounded by a thin film of liquid from the second chamber (4), forming a free flying droplet just outside the second nozzle/orifice (2).</p> |
