Incremental printing of symbolic information – Ink jet – Controller
Patent
1992-11-30
1995-10-17
Hartary, Joseph W.
Incremental printing of symbolic information
Ink jet
Controller
B41J 205, B41J 29377
Patent
active
054594987
ABSTRACT:
An ink-cooled thermal ink jet printhead has an efficient heat exchanger located on the back side of the printhead that eliminates the need for heat sinks. All ink flowing to the firing chamber goes through the heat exchanger. The geometry of the heat exchanger is chosen so that almost all the residual heat absorbed by the printhead substrate is transferred to the ink as it flows to the firing chamber. Additionally, the pressure drop of the ink flowing through the heat exchanger is low enough so that it does not significantly reduce the refill rate of the firing chambers. The heat exchanger can have one or more active heat exchanger sides. The heat exchanger has little thermal mass itself and significantly reduces the thermal mass of printhead by eliminating the need for a heat sink. This reduces the warm-up time of the printhead to a fraction of a second.
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Fong-Ho May
Hand Lawrence A.
Nielsen Niels J.
Seccombe Dana
Yeung King-Wah W.
Bobb Alrick
Griffin Ron
Hartary Joseph W.
Hewlett--Packard Company
Maker, II. Edward
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