Ink jet printing system having heat keeping function
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United States of America Patent
Stats
-
May 8, 2001
Grant Date -
N/A
app pub date -
Jun 30, 1997
filing date -
Jul 2, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An ink jet head supplies an ejection heater arranged in a liquid path with a driving signal to impart heat energy to ink to thereby generate a bubble therein. The bubble is caused to communicated with the atmospheric air, and ink is ejected through an ejection outlet. A heat keeping circuit supplies the ejection heater with a driving pulse having a time width insufficient for causing ink to be ejected during non-printing period in an appropriate duty corresponding to the head temperature condition, thereby causing the ejection heater to generate heat to effect heat keeping on the head, whereby a low-cost thermal ink jet printing system is provided which does not entail a variation in ejection amount during printing.
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