Thermal ink-jet printhead with an optimized fluid flow channel i

Details Thermal ink-jet printhead with an optimized fluid flow channel i Thermal ink-jet printhead with an optimized fluid flow channel i

1996-04-15

1998-05-12

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 94, B41J 205

Patent

active

057513171

ABSTRACT:
A thermal ink-jet ejector having a fluid flow channel extending between an ink inlet and a nozzle for the ejection of liquid ink therefrom, includes a rear channel diffuser disposed between the heating element and the inlet, and/or a front channel diffuser disposed between the heating element and the nozzle. Each diffuser includes an arrangement of tapers which decrease the flow impedance of liquid ink flowing toward the nozzle, and increase the flow impedance of liquid ink flowing toward the inlet. The arrangement increases the kinetic energy of droplets being ejected, and also increases the speed of re-fill of the channel with liquid ink following ejection.

REFERENCES:
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patent: 4496960 (1985-01-01), Fischbeck
patent: 4514742 (1985-04-01), Suga
patent: 4550326 (1985-10-01), Allen et al.
patent: 4630072 (1986-12-01), Scardovi
patent: 4675693 (1987-06-01), Yano et al.
patent: 4723136 (1988-02-01), Suzumura
patent: 4882596 (1989-11-01), Tsuzuki
patent: 5041844 (1991-08-01), Deshpande
patent: 5278585 (1994-01-01), Karz et al.
"A Novel Piezoelectric Valve-Less Fluid Pump" by Stemme and Stemme. The Seventh International Conference on Process Transducers, Yokohama Japan (1993) pp. 110-113.

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