Ink chamber with pressure relief chamber having pressure relief aperture and microparticles to exert capilliary action on ink
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United States of America Patent
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Apr 28, 1998
Grant Date -
N/A
app pub date -
May 16, 1996
filing date -
May 16, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ink jet cartridge comprising an ink chamber, at least one aperture coupling a pressure relief chamber to the ink chamber, the aperture having a small internal diameter for creating a negative pressure on any ink in the lower portion of the ink chamber and a plurality of microparticles positioned in the pressure relief chamber for forming a plurality of small interstices which form a capillary path in the pressure relief chamber, the microparticles creating a negative pressure on any ink in the lower portion of the ink chamber and the selected size of the microparticles resulting in a capillary path of selected size for controlling the magnitude of the negative pressure in the lower portion of the ink chamber. The pressure relief chamber is positioned below the ink chamber, the ink chamber including an opening to couple the ink cartridge to an ink jet head and the aperture is positioned at the lower portion of the ink chamber.
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