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United States of America Patent
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Jul 24, 2012
Grant Date -
Dec 23, 2010
app pub date -
Jun 15, 2010
filing date -
Jun 17, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
An ink discharge unit includes a plurality of nozzles and corresponding ink propelling mechanisms for the nozzles, and configured to discharge ink through the nozzles in accordance with drive signals to drive the ink propelling mechanisms, an ink temperature sensor is adapted to measure a temperature of ink at the ink discharge unit, and a negative-pressure controller is configured to control negative pressures acting on menisci formed in vicinities of the nozzles by surface tension of ink at the ink discharge unit, wherein the negative-pressure controller is configured to work with a discharge of ink by the ink discharge unit, operating for a measured temperature of ink by the ink temperature sensor equal to or higher than a first reference, to control the negative pressures to a first value, and for a measured temperature of ink by the ink temperature sensor lower than the first reference, to control the negative pressures to a second value which is lower than the first value.
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