Liquid droplet dispensing
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United States of America Patent
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-
Dec 30, 2003
Grant Date -
Nov 28, 2002
app pub date -
Mar 26, 2001
filing date -
Mar 26, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A dispenser (1) for liquid droplets of the order of 30 .mu.l or less in volume. The dispenser (1) comprises a metering valve body (2) having a main bore (3) connected by a pipe (4) to a pressurised liquid delivery source (not shown). The body (2) comprises a base (5) from which is mounted a nozzle (6) projecting above the base (5) to form a valve seat (7). An actuating coil assembly (11) is mounted on the exterior of the body (2) for moving a floating valve boss (15) of a ferromagnetic material. Sensing coils (20, 21) are mounted around and spaced-apart along the body (2) forming part of a valve boss detector. The valve boss detector acts as a positional movement detector so that the opening and closing of the valve can be accurately controlled and bouncing of the valve boss (15) either against an end stop (9) or on the valve seat (7) can be greatly minimized, if not prevented fully, by careful operation of the actuating coil assembly (11).
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