Ink jet printing apparatus, ink jet printing method and ink jet print head with control of drive voltage and pulse width
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United States of America Patent
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Aug 27, 2002
Grant Date -
N/A
app pub date -
Oct 11, 2000
filing date -
Oct 12, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An ink jet printing apparatus capable of forming a high quality multivalued image without using a plurality of print heads and suited for a size reduction is provided. In an ink jet printing apparatus in which the electrothermal transducers are heated by a drive pulse to generate bubbles in ink and in which the pressure of the bubbles is used to eject ink droplets from nozzles onto a print medium to print an image, the drive voltage and the drive pulse width for the print head are changed simultaneously in accordance with print data. For example, when ejecting small droplets, the drive voltage for the nozzles is increased and the drive pulse width shortened. When ejecting large droplets, the drive voltage is lowered and the drive pulse width elongated.
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