Valves and valve actuation – Electrically actuated valve
Patent
1997-12-29
2000-10-03
Rivell, John
Valves and valve actuation
Electrically actuated valve
13712917, 251331, F16K 3102, F16K 714
Patent
active
061261408
ABSTRACT:
A monolithic, bi-directional micro device formed on a support base, for example a silicon wafer, including at least one input and output flow channels for flow of fluid. The actuator portion includes electrically conducting upper lower diaphragms (preferably formed from doped polycrystalline silicon) formed about a central electrode and mounted on the base. The diaphragms move under electrostatic force between first and second positions upon application of voltage. The upper and lower diaphragms form a sealed, enclosed cavity separated from the channels. The diaphragms are connected for mechanically transmitting electrostatically induced force from one diaphragm to the other, preferably by one or more posts passing through at least one hole formed in the central electrode. The lower diaphragm and the support base are maintained at the same electrical potential. The device is formed by depositing and patterning the electrodes and forming spaces between the electrodes by etching of sacrificial layers. One or more input flow channels and/or output flow channels are etched in the support base from either the frontside or the backside. Electrical contacts are formed by etching and metalizing pads to provide electrical paths for voltage to be selectively applied to the capacitor electrodes.
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Johnson Burgess R.
Kimura S.
Youngner Daniel W.
Honeywell International , Inc.
Rivell John
Schoenfeld Meredith H
Shudy Jr. John G.
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