Piston-driven fluid-ejection apparatus
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United States of America Patent
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May 3, 2005
Grant Date -
N/A
app pub date -
Jun 18, 2003
filing date -
Jun 18, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A surface-micromachined fluid-ejection apparatus is disclosed which utilizes a piston to provide for the ejection of jets or drops of a fluid (e.g. for ink-jet printing). The piston, which is located at least partially inside a fluid reservoir, is moveable into a cylindrical fluid-ejection chamber connected to the reservoir by a microelectromechanical (MEM) actuator which is located outside the reservoir. In this way, the reservoir and fluid-ejection chamber can be maintained as electric-field-free regions thereby allowing the apparatus to be used with fluids that are electrically conductive or which may react or break down in the presence of a high electric field. The MEM actuator can comprise either an electrostatic actuator or a thermal actuator.
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