Ink-jet printing method and apparatus therefor
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United States of America Patent
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-
Nov 17, 1998
Grant Date -
N/A
app pub date -
Jul 27, 1995
filing date -
Jul 29, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An ink-jet printing apparatus can obtain good image quality and improve reliability by avoiding possibility of failure of the head. A target temperature, at which ejection of ink through an ink-jet printing head becomes the most stable is set. Also, a difference between the target temperature and an actual temperature of the ink-jet printing head is derived. When the difference is positive, the drive signal includes a pre-heating pulse and a main heating pulse having an interval therebetween. The pulse width or the interval is properly set. When the drive signal is negative, only the main heating pulse is included. When the absolute value of the difference is large, the pulse widths are set smaller. At this time, a drive frequency is lowered or a resting period at opposite end positions in the scanning directions is prolonged.
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Cited Art Landscape
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