Ink pressure regulator using air bubbles drawn into headspace
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United States of America Patent
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May 25, 2010
Grant Date -
Jun 19, 2008
app pub date -
Dec 18, 2006
filing date -
Dec 18, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An ink cartridge suitable for regulating a hydrostatic pressure of ink supplied to an inkjet printhead is provided. The cartridge comprises an ink chamber having an ink outlet for fluid communication with the printhead via an ink line; an air inlet open to atmosphere; a bubble outlet for bubbling air bubbles into the chamber, each air bubble comprising an air cavity trapped inside a film or a body of ink; and an air channel connecting the air inlet and the bubble outlet. The bubble outlet is dimensioned to control a Laplace pressure of air bubbles drawn into the chamber as result of supplying ink to the printhead, thereby regulating a hydrostatic pressure of the ink.
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